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<table id="SummaryNotReq1" border="0" width="610"cellspacing="0" cellpadding="0">
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<img id="LongDescNotReq1" border="0"src="images/hdf_logo.jpg" width="90" height="70" alt="The HDF Group" valign="top" />
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<td valign="middle" align="center">
<b><H1>HDF Reference Manual</H1></b>
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<hr />
<blockquote>
<a name="wp442213"> </a><h2 class="pRef_H_Adv_RoutineName">
<p align=right><A HREF="RM_Section_II_H_AdvLOP.html">
[H Advance Interface]</A><a HREF="RMTOP.html"><b>[Top]</b></a>
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<hr />
Happendable
</h2>
<a name="wp442214"> </a><p style="font-weight: normal" class="pSignature">
intn Happendable(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>)
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<a name="wp444509"> </a><p class="pBodyRelative">
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<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442284table442282">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442284"> </a><div style="margin-top: 0pt" class="pCellVariable">
<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>
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<td><a name="wp442286"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
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<td><a name="wp442288"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartwrite</b>
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<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442291table442289">
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<a name="wp442291"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442293"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Specifies that the specified element can be appended to
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<a name="wp442295"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
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<td><a name="wp442297"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if data element can be appended and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
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<a name="wp442299"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442301"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If a data element is at the end of a file <b class="cFunctionName">Happendable</b> allows <b class="cFunctionName">Hwrite</b> to append data to it, converting it to linked-block element only when necessary.
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<p class="pBodyRelative">
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<a name="wp442257"> </a><h2 class="pRef_H_Adv_RoutineName">
<p align=right><A HREF="RM_Section_II_H_AdvLOP.html">
[H Advance Interface]</A><a HREF="RMTOP.html"><b>[Top]</b></a>
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<hr />
Hcache
</h2>
<a name="wp441280"> </a><p style="font-weight: normal" class="pSignature">
intn Hcache(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, intn <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">cache_switch</span>)
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<a name="wp442306"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
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<td><a name="wp442308"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
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<td><a name="wp442310"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
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<a name="wp442312"> </a><div style="margin-top: 0pt" class="pCellVariable">
cache_switch
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<td><a name="wp442314"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
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<td><a name="wp442316"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Flag to enable or disable caching
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</table>
</div>
<p class="pBodyRelative">
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<a name="wp442319"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442321"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Enables low-level caching for the specified file.
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<a name="wp442323"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442325"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
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<a name="wp442327"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442329"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span> is set to <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">CACHE_ALL_FILES</span>, then the value of <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">cache_switch</span> is used to modify the default file cache setting.
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<a name="wp442331"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp442337"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Valid values for <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">cache_switch</span> are: <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">TRUE</span> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">1</span>) to enable caching and <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">FALSE</span> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) to disable caching.
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<hr />
Hdeldd
</h2>
<a name="wp421118"> </a><p style="font-weight: normal" class="pSignature">
intn Hdeldd(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">ref</span>)
</p>
<a name="wp447900"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442389table442387">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442389"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp442391"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442393"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442395"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp442397"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442399"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag of data descriptor to be deleted
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442401"> </a><div style="margin-top: 0pt" class="pCellVariable">
ref
</div>
</td>
<td><a name="wp442403"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442405"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number of data descriptor to be deleted
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
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<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442408table442406">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442408"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442410"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Deletes a tag and reference number from the data descriptor list.
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</td>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442412"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442414"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442416"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442418"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Once the data descriptor is removed, the data in the data object becomes inaccessible and is marked as such. To remove inaccessible data from an HDF file, use the utility <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">hdfpack</span>.
</div>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442420"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp442428"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hdeldd</b> only deletes the specified tag and reference number from the data descriptor list. Data objects containing the deleted tag and reference number are not automatically updated. For example, if the tag and reference number deleted from the descriptor list referenced an object in a vgroup, the tag and reference number will still exist in the vgroup even though the data is inaccessible.
</div>
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Hendaccess
</h2>
<a name="wp421188"> </a><p style="font-weight: normal" class="pSignature">
intn Hendaccess(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>)
</p>
<a name="wp447904"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442434table442432">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442434"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp442436"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442438"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartread</b>, <b class="cFunctionName">Hstartwrite</b>, or <b class="cFunctionName">Hnextread</b>
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
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<div align="left">
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<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442441"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442443"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Terminates access to a data object by disposing of the access identifier.
</div>
</td>
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<a name="wp442445"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442447"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442449"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442451"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
The number of active access identifiers is limited to <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">MAX_ACC</span> as defined in the <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">hlimits.h</span> header file. Because of this restriction, it is very important to call <b class="cFunctionName">Hendaccess</b> immediately following the last operation on a data element.
</div>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442453"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp442465"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
When developing new interfaces, a common mistake is to omit calling <b class="cFunctionName">Hendaccess</b> for all of the elements accessed. When this happens, <b class="cFunctionName">Hclose</b> will return <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code>, and a dump of the error stack will report the number of active access identifiers. Refer to the Reference Manual page on <b class="cFunctionName">HEprint</b>.
</div>
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<a name="wp442457"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp442467"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
This is a difficult problem to debug because the low levels of the HDF library cannot determine who and where an access identifier was originated. As a result, there is no automated method of determining which access identifiers have yet to be released.
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<hr />
Hendbitaccess
</h2>
<a name="wp441812"> </a><p style="font-weight: normal" class="pSignature">
intn Hendbitaccess(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, intn <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">flushbit</span>)
</p>
<a name="wp447908"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442473table442471">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442473"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp442475"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442477"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Identifier of the bit-access element to be disposed of
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442479"> </a><div style="margin-top: 0pt" class="pCellVariable">
flushbit
</div>
</td>
<td><a name="wp442481"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442483"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Specifies how the leftover bits are to be flushed
</div>
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</div>
<p class="pBodyRelative">
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442486"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442488"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Disposes of the specified bit-access file element.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442490"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442492"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442494"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442496"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If called after a bit-write operation, <b class="cFunctionName">Hendbitaccess</b> flushes all buffered bits to the dataset, then calls <b class="cFunctionName">Hendaccess</b>.
</div>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442498"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp442502"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
"Leftover bits" are bits that have been buffered, but are fewer than the number of bits defined by <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">BITNUM</span>, which is usually set to <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">8</span>.
</div>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442521"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp442534"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Valid codes for <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">flushbit</span> are: 0 for flush with zeros, 1 for flush with ones and -1 for dispose of leftover bits
</div>
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</tr>
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Hexist
</h2>
<a name="wp441048"> </a><p style="font-weight: normal" class="pSignature">
intn Hexist(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">search_tag</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">search_ref</span>)
</p>
<a name="wp447912"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442555table442553">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442555"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp442557"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442559"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartread</b>, <b class="cFunctionName">Hstartwrite</b>, or <b class="cFunctionName">Hnextread</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442561"> </a><div style="margin-top: 0pt" class="pCellVariable">
search_tag
</div>
</td>
<td><a name="wp442563"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442565"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag of the object to be searched for
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442567"> </a><div style="margin-top: 0pt" class="pCellVariable">
search_ref
</div>
</td>
<td><a name="wp442569"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442571"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number of the object to be searched for
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
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<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442574table442572">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442574"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442576"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Locates an object in an HDF file.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442578"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442580"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442582"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442584"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Simple interface to <b class="cFunctionName">Hfind</b> that determines if a given tag/reference number pair exists in a file. Wildcards apply.
</div>
</td>
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<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442586"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp442590"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hfind</b> performs all validity checking; this is just a <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">very</span> simple wrapper around it.
</div>
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Hfidinquire
</h2>
<a name="wp421220"> </a><p style="font-weight: normal" class="pSignature">
intn Hfidinquire(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, char *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">filename</span>, intn *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">access</span>, intn *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">attach</span>)
</p>
<a name="wp447916"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442602table442600">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442602"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp442604"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442606"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442608"> </a><div style="margin-top: 0pt" class="pCellVariable">
filename
</div>
</td>
<td><a name="wp442610"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442612"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Complete path and filename for the file
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442614"> </a><div style="margin-top: 0pt" class="pCellVariable">
access
</div>
</td>
<td><a name="wp442616"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442618"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access mode file is opened with
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442620"> </a><div style="margin-top: 0pt" class="pCellVariable">
attach
</div>
</td>
<td><a name="wp442622"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442624"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Number of access identifiers attached to the file
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442627table442625">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442627"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442629"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns file information through a reference of its file identifier.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442631"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442633"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442635"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442637"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Gets the complete path name, access mode, and number of access identifiers associated with a file. The <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">filename</span> parameter is a pointer to a character pointer which will be modified when the function returns. Upon completion, <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">filename</span> is set to point to the file name in internal storage. All output parameters must be non-null pointers.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp421243"> </a><h2 class="pRef_H_Adv_RoutineName">
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</p>
<hr />
Hfind
</h2>
<a name="wp421245"> </a><p style="font-weight: normal" class="pSignature">
intn Hfind(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">search_tag</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">search_ref</span>, uint16 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_tag</span>, uint16 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_ref</span>, int32 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_offset</span>, int32 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_length</span>, intn <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">direction</span>)
</p>
<a name="wp447920"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442642table442640">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442642"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp442644"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442646"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442648"> </a><div style="margin-top: 0pt" class="pCellVariable">
search_tag
</div>
</td>
<td><a name="wp442650"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442652"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
The tag to search for or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DFTAG_WILDCARD</span>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442654"> </a><div style="margin-top: 0pt" class="pCellVariable">
search_ref
</div>
</td>
<td><a name="wp442656"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442658"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number to search for or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DFREF_WILDCARD</span>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442660"> </a><div style="margin-top: 0pt" class="pCellVariable">
find_tag
</div>
</td>
<td><a name="wp442662"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN/OUT:
</div>
</td>
<td><a name="wp442664"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If (*<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_tag</span> == 0) and (*<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_ref</span> == 0) then start the search from either the beginning or the end of the file. If the object is found, the tags of the object will be returned here.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442666"> </a><div style="margin-top: 0pt" class="pCellVariable">
find_ref
</div>
</td>
<td><a name="wp442668"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN/OUT:
</div>
</td>
<td><a name="wp442670"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If (*<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_tag</span> == 0) and (*<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_ref</span> == 0) then start the search from either the beginning or the end of the file. If the object is found, the reference numbers of the object will be returned here.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442672"> </a><div style="margin-top: 0pt" class="pCellVariable">
find_offset
</div>
</td>
<td><a name="wp442674"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442676"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Offset of the data element found
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442678"> </a><div style="margin-top: 0pt" class="pCellVariable">
find_length
</div>
</td>
<td><a name="wp442680"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442682"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Length of the data element found
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442684"> </a><div style="margin-top: 0pt" class="pCellVariable">
direction
</div>
</td>
<td><a name="wp442686"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442688"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Direction to search in <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_FORWARD</span> searches forward from the current location, and <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_BACKWARD</span> searches backward from the current location
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442691table442689">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442691"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442693"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Locates the next object to be searched for in an HDF file.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442695"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442697"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442699"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442701"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hfind</b> searches for the next data element that matches the specified tag and reference number. Wildcards apply. If <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">direction</span> is <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_FORWARD</span>, searching is forward from the current position in the file, otherwise <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_BACKWARD</span> specifies backward searches from the current position in the file.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442703"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp442711"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_tag</span> and <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">find_ref</span> are both set to <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>, this indicates the beginning of a search, and the search will start from the beginning of the file if the direction is <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_FORWARD</span> and from the end of the file if the direction is <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_BACKWARD</span>.
</div>
</td>
</tr>
</table>
</div>
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</p>
<a name="wp441766"> </a><h2 class="pRef_H_Adv_RoutineName">
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<hr />
Hgetbit
</h2>
<a name="wp441767"> </a><p style="font-weight: normal" class="pSignature">
intn Hgetbit(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>)
</p>
<a name="wp447928"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442734table442732">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442734"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp442736"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442738"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Bit-access element identifier
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442741table442739">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442741"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442743"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reads one bit from the specified bit-access element.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442745"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442747"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the bit read (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span> or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">1</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442749"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442751"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
This function is a wrapper for <b class="cFunctionName">Hbitread</b>.
</div>
</td>
</tr>
</table>
</div>
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</p>
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<hr />
Hgetelement
</h2>
<a name="wp421282"> </a><p style="font-weight: normal" class="pSignature">
int32 Hgetelement(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">ref</span>, uint8 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">data</span>)
</p>
<a name="wp447932"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442756table442754">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442756"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp442758"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442760"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442762"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp442764"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442766"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag of the data element to be read
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442768"> </a><div style="margin-top: 0pt" class="pCellVariable">
ref
</div>
</td>
<td><a name="wp442770"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442772"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number of the data element to be read
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442774"> </a><div style="margin-top: 0pt" class="pCellVariable">
data
</div>
</td>
<td><a name="wp442776"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442778"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Buffer the element will be read into
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442781table442779">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442781"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442783"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reads the data element for the specified tag and reference number and writes it to the <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">data</span> buffer.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442785"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442787"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the number of bytes read if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442789"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442791"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
It is assumed that the space allocated for the buffer is large enough to hold the data.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp421353"> </a><h2 class="pRef_H_Adv_RoutineName">
<p align=right><A HREF="RM_Section_II_H_AdvLOP.html">
[H Advance Interface]</A><a HREF="RMTOP.html"><b>[Top]</b></a>
</p>
<hr />
Hinquire
</h2>
<a name="wp421355"> </a><p style="font-weight: normal" class="pSignature">
intn Hinquire(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, int32 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, uint16 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>, uint16 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">ref</span>, int32 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">length</span>, int32 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">offset</span>, int32 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">position</span>, int16 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">access</span>, int16 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">special</span>)
</p>
<a name="wp447935"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442882table442880">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442882"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp442884"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442886"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartread</b>, <b class="cFunctionName">Hstartwrite</b>, or <b class="cFunctionName">Hnextread</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442888"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp442890"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442892"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442894"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp442896"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442898"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag of the element pointed to
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442900"> </a><div style="margin-top: 0pt" class="pCellVariable">
ref
</div>
</td>
<td><a name="wp442902"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442904"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number of the element pointed to
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442906"> </a><div style="margin-top: 0pt" class="pCellVariable">
length
</div>
</td>
<td><a name="wp442908"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442910"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Length of the element pointed to
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442912"> </a><div style="margin-top: 0pt" class="pCellVariable">
offset
</div>
</td>
<td><a name="wp442914"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442916"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Offset of the element in the file
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442918"> </a><div style="margin-top: 0pt" class="pCellVariable">
position
</div>
</td>
<td><a name="wp442920"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442922"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Current position within the data element
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442924"> </a><div style="margin-top: 0pt" class="pCellVariable">
access
</div>
</td>
<td><a name="wp442926"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442928"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
The access type for this data element
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442930"> </a><div style="margin-top: 0pt" class="pCellVariable">
special
</div>
</td>
<td><a name="wp442932"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp442934"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Special code
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442937table442935">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442937"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442939"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns access information about a data element.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442941"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442943"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if the access identifier points to a valid data element and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442945"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp442947"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span> is a valid access identifier the access type (read or write) is set regardless of whether or not the return value is <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>). If <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span> is invalid, the function returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) and the access type is set to zero. To avoid excess information, pass <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">NULL</span> for any unnecessary pointer.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp421460"> </a><h2 class="pRef_H_Adv_RoutineName">
<p align=right><A HREF="RM_Section_II_H_AdvLOP.html">
[H Advance Interface]</A><a HREF="RMTOP.html"><b>[Top]</b></a>
</p>
<hr />
Hlength
</h2>
<a name="wp421462"> </a><p style="font-weight: normal" class="pSignature">
int32 Hlength(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">ref</span>)
</p>
<a name="wp447942"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442974table442972">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442974"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp442976"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442978"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442980"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp442982"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442984"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag of the data element
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442986"> </a><div style="margin-top: 0pt" class="pCellVariable">
ref
</div>
</td>
<td><a name="wp442988"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp442990"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number of the data element
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp421467"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp442993table442991">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442993"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp442995"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the length of a data object specified by the tag and reference number.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp442997"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp442999"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the length of data element if found and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443001"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443003"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hlength</b> calls <b class="cFunctionName">Hstartread</b>, <b class="cFunctionName">HQuerylength</b>, and <b class="cFunctionName">Hendaccess</b> to determine the length of a data element. <b class="cFunctionName">Hlength</b> uses <b class="cFunctionName">Hstartread</b> to obtain an access identifier for the specified data object.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443005"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp443009"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hlength</b> will return the correct data length for linked-block elements, however it is important to remember that the data in linked-block elements is not stored contiguously.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp441925"> </a><h2 class="pRef_H_Adv_RoutineName">
<p align=right><A HREF="RM_Section_II_H_AdvLOP.html">
[H Advance Interface]</A><a HREF="RMTOP.html"><b>[Top]</b></a>
</p>
<hr />
Hnewref
</h2>
<a name="wp421491"> </a><p style="font-weight: normal" class="pSignature">
uint16 Hnewref(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>)
</p>
<a name="wp447946"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443014table443012">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443014"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp443016"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443018"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443021table443019">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443021"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443023"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns a reference number that can be used with any tag to produce a unique tag /reference number pair.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443025"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443027"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the reference number if successful and <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span> otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443029"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443031"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Successive calls to <b class="cFunctionName">Hnewref</b> will generate reference number values that increase by one each time until the highest possible reference number has been returned. At this point, additional calls to <b class="cFunctionName">Hnewref</b> will return an increasing sequence of unused reference number values starting from <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">1</span>.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp421510"> </a><h2 class="pRef_H_Adv_RoutineName">
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[H Advance Interface]</A><a HREF="RMTOP.html"><b>[Top]</b></a>
</p>
<hr />
Hnextread
</h2>
<a name="wp421512"> </a><p style="font-weight: normal" class="pSignature">
intn Hnextread(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">ref</span>, int <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">origin</span>)
</p>
<a name="wp447948"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443036table443034">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443036"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp443038"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443040"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartread</b> or previous <b class="cFunctionName">Hnextread</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443042"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp443044"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443046"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag to search for
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443048"> </a><div style="margin-top: 0pt" class="pCellVariable">
ref
</div>
</td>
<td><a name="wp443050"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443052"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number to search for
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443054"> </a><div style="margin-top: 0pt" class="pCellVariable">
origin
</div>
</td>
<td><a name="wp443056"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443058"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Position to begin search: <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_START</span> or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_CURRENT</span>
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443061table443059">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443061"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443063"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Searches for the next data descriptor that matches the specified tag and reference number.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443065"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443067"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443069"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443071"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Wildcards apply. If origin is <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_START</span>, the search will start at the beginning of the data descriptor list. If origin is <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_CURRENT</span>, the search will begin at the current position. Searching backwards from the end of a data descriptor list is not yet implemented.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443073"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp443079"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If the search is successful, the access identifier reflects the new data element, otherwise it is not modified.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp421539"> </a><h2 class="pRef_H_Adv_RoutineName">
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</p>
<hr />
Hnumber/hnumber
</h2>
<a name="wp421541"> </a><p style="font-weight: normal" class="pSignature">
int32 Hnumber(int32 file_id, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>)
</p>
<a name="wp447952"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443088table443086">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443088"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp443090"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443092"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443094"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp443096"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443098"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag to be counted
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443101table443099">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443101"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443103"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the number of instances of a tag in a file.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443105"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443107"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the number of instances of a tag in a file if successful, and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443109"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443111"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hnumber</b> determines how many objects with the specified tag are in a file. To determine the total number of objects in a file, set the <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span> argument to <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DFTAG_WILDCARD</span>. Note that a return value of zero is not a fail condition.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443114table443112">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443114"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
FORTRAN
</div></td>
<td><a name="wp443116"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellFortSyntax">
integer function hnumber(file_id, tag)
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443122"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp443124"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellFortVar">
integer file_id, tag
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
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</p>
<hr />
Hoffset
</h2>
<a name="wp421566"> </a><p style="font-weight: normal" class="pSignature">
int32 Hoffset(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">ref</span>)
</p>
<a name="wp447956"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443132table443130">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443132"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp443134"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443136"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443138"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp443140"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443142"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag of the data element
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443144"> </a><div style="margin-top: 0pt" class="pCellVariable">
ref
</div>
</td>
<td><a name="wp443146"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443148"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number of the data element
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443151table443149">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443151"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443153"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the offset of a data element in the file.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443155"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443157"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the offset of the data element if the data element exists and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443159"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443161"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hoffset</b> calls <b class="cFunctionName">Hstartread</b>, <b class="cFunctionName">HQueryoffset</b>, and <b class="cFunctionName">Hendaccess</b> to determine the length of a data element. <b class="cFunctionName">Hoffset</b> uses <b class="cFunctionName">Hstartread</b> to obtain an access identifier for the specified data object.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443163"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp443175"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hoffset</b> will return the correct offset for a linked-block element, however it is important to remember that the data in linked-block elements is not stored contiguously. The offset returned by <b class="cFunctionName">Hoffset</b> only reflects the position of the first data block.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443167"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp443177"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hoffset</b> should not be used to determine the offset of an external element. In this case, <b class="cFunctionName">Hoffset</b> returns zero, an invalid offset for HDF files.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
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<hr />
Hputbit
</h2>
<a name="wp441894"> </a><p style="font-weight: normal" class="pSignature">
intn Hputbit(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, intn <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">bit</span>)
</p>
<a name="wp447959"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443383table443381">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443383"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp443385"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443387"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Bit-access element identifier
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443389"> </a><div style="margin-top: 0pt" class="pCellVariable">
bit
</div>
</td>
<td><a name="wp443391"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443393"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Bit to be written
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443396table443394">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443396"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443398"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Writes one bit to the specified bit-access element.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443400"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443402"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443404"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443406"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
This function is a wrapper for <b class="cFunctionName">Hbitwrite</b>.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
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<hr />
Hputelement
</h2>
<a name="wp421648"> </a><p style="font-weight: normal" class="pSignature">
int32 Hputelement(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">ref</span>, uint8 *<span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">data</span>, int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">length</span>)
</p>
<a name="wp447963"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443411table443409">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443411"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp443413"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443415"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443417"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp443419"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443421"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag of the data element to add or replace
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443423"> </a><div style="margin-top: 0pt" class="pCellVariable">
ref
</div>
</td>
<td><a name="wp443425"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443427"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reference number of the data element to add or replace
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443429"> </a><div style="margin-top: 0pt" class="pCellVariable">
data
</div>
</td>
<td><a name="wp443431"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443433"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Pointer to data buffer
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443435"> </a><div style="margin-top: 0pt" class="pCellVariable">
length
</div>
</td>
<td><a name="wp443437"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443439"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Length of data to write
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443442table443440">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443442"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443444"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Writes a data element or replaces an existing data element in a HDF file.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443446"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443448"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the number of bytes written if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
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</p>
<hr />
Hread
</h2>
<a name="wp421672"> </a><p style="font-weight: normal" class="pSignature">
int32 Hread(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">length</span>, VOIDP <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">data</span>)
</p>
<a name="wp447966"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443453table443451">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443453"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp443455"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443457"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartread</b>, <b class="cFunctionName">Hstartwrite</b>, or <b class="cFunctionName">Hnextread</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443459"> </a><div style="margin-top: 0pt" class="pCellVariable">
length
</div>
</td>
<td><a name="wp443461"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443463"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Length of segment to be read
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443465"> </a><div style="margin-top: 0pt" class="pCellVariable">
data
</div>
</td>
<td><a name="wp443467"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
OUT:
</div>
</td>
<td><a name="wp443469"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Pointer to the data array to be read
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp421677"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443472table443470">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443472"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443474"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Reads the next segment in a data element.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443476"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443478"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the length of segment actually read if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443480"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443482"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hread</b> begins reading at the current file position, reads the specified number of bytes, and increments the current file position by one. Calling <b class="cFunctionName">Hread</b> with the <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">length</span> = <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span> reads the entire data element. To reposition an access identifier before writing data, use <b class="cFunctionName">Hseek</b>.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443484"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp443492"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">length</span> is longer than the data element, the read operation is terminated at the end of the data element, and the number of read bytes is returned. Although only one access identifier is allowed per data element, it is possible to interlace reads from multiple data elements in the same file. It is assumed that data is large enough to hold the specified data length.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
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<hr />
Hseek
</h2>
<a name="wp421704"> </a><p style="font-weight: normal" class="pSignature">
intn Hseek(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">offset</span>, intn <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">origin</span>)
</p>
<a name="wp447969"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443497table443495">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443497"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp443499"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443501"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartread</b>, <b class="cFunctionName">Hstartwrite</b>, or <b class="cFunctionName">Hnextread</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443503"> </a><div style="margin-top: 0pt" class="pCellVariable">
offset
</div>
</td>
<td><a name="wp443505"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443507"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Number of bytes to seek to from the origin
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443509"> </a><div style="margin-top: 0pt" class="pCellVariable">
origin
</div>
</td>
<td><a name="wp443511"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443513"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Position of the offset origin
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443516table443514">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443516"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443518"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Sets the access pointer to an offset within a data element.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443520"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443522"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443524"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443526"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Sets the seek position for the next <b class="cFunctionName">Hread</b> or <b class="cFunctionName">Hwrite</b> operation by moving an access identifier to the specified position in a data element. The <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">origin</span> and the <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">offset</span> arguments determine the byte location for the access identifier. If <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">origin</span> is set to <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_START</span>, the offset is added to the beginning of the data element. If <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">origin</span> is set to <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_CURRENT</span>, the offset is added to the current position of the access identifier.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443528"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp443538"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Valid values for <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">origin</span> are: <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_START</span> (the beginning of the file) or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">DF_CURRENT</span> (the current position in the file).
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443532"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp443540"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
This routine fails if the access identifier if <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span> is invalid or if the seek position is outside the range of the data element.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp441320"> </a><h2 class="pRef_H_Adv_RoutineName">
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<hr />
Hsetlength
</h2>
<a name="wp441175"> </a><p style="font-weight: normal" class="pSignature">
int32 Hsetlength(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">length</span>)
</p>
<a name="wp447975"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443544table443542">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443544"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp443546"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443548"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
File identifier returned by <b class="cFunctionName">Hopen</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443550"> </a><div style="margin-top: 0pt" class="pCellVariable">
length
</div>
</td>
<td><a name="wp443552"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443554"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Length of the new element
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443557table443555">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443557"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443559"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Specifies the length of a new HDF element.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443561"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443563"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443565"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443567"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
This function can only be used when called after <b class="cFunctionName">Hstartaccess</b> on a new data element and before any data is written to that element.
</div>
</td>
</tr>
</table>
</div>
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<hr />
Hshutdown
</h2>
<a name="wp441375"> </a><p style="font-weight: normal" class="pSignature">
int32 Hshutdown( )
</p>
<a name="wp447979"> </a><p class="pBodyRelative">
</p>
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<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443572"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443574"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Deallocates buffers previously allocated in other H routines.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443576"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443578"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns <code style="font-family: Courier New; font-size: 8pt" class="cDefName">SUCCEED</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span>) if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443580"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443582"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Should only be called by the function <b class="cFunctionName">HDFend</b>.
</div>
</td>
</tr>
</table>
</div>
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</p>
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</p>
<hr />
Htagnewref
</h2>
<a name="wp441424"> </a><p style="font-weight: normal" class="pSignature">
int32 Htagnewref(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">file_id</span>, uint16 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">tag</span>)
</p>
<a name="wp447983"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443587table443585">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443587"> </a><div style="margin-top: 0pt" class="pCellVariable">
file_id
</div>
</td>
<td><a name="wp443589"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443591"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartread</b> or <b class="cFunctionName">Hnextread</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443593"> </a><div style="margin-top: 0pt" class="pCellVariable">
tag
</div>
</td>
<td><a name="wp443595"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443597"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Tag to be identified with the returned reference number
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443600table443598">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443600"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443602"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns a reference number that is unique for the specified file that will correspond to the specified tag. Creates a new tag/reference number pair.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443604"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443606"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the reference number if successful and <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span> otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443608"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443610"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Successive calls to <b class="cFunctionName">Hnewref</b> will generate a increasing sequence of reference number values until the highest possible reference number value has been returned. It will then return unused reference number values starting from <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">1</span> in increasing order.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp441266"> </a><h2 class="pRef_H_Adv_RoutineName">
<p align=right><A HREF="RM_Section_II_H_AdvLOP.html">
[H Advance Interface]</A><a HREF="RMTOP.html"><b>[Top]</b></a>
</p>
<hr />
Htrunc
</h2>
<a name="wp421815"> </a><p style="font-weight: normal" class="pSignature">
int32 Htrunc(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">trunc_len</span>)
</p>
<a name="wp447987"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443615table443613">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443615"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp443617"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443619"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartread</b> or <b class="cFunctionName">Hnextread</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443621"> </a><div style="margin-top: 0pt" class="pCellVariable">
trunc_len
</div>
</td>
<td><a name="wp443623"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp443625"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Length to truncate element
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp443628table443626">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443628"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp443630"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Truncates the data object specified by the <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span> to the length <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">trunc_len</span>.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443632"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp443634"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the length of a data element if found and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp443636"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp443638"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Htrunc</b> does not handle special elements.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp421834"> </a><h2 class="pRef_H_Adv_RoutineName">
<p align=right><A HREF="RM_Section_II_H_AdvLOP.html">
[H Advance Interface]</A><a HREF="RMTOP.html"><b>[Top]</b></a>
</p>
<hr />
Hwrite
</h2>
<a name="wp421836"> </a><p style="font-weight: normal" class="pSignature">
int32 Hwrite(int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">h_id</span>, int32 <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">length</span>, VOIDP <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">data</span>)
</p>
<a name="wp457240"> </a><p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp457206table457204">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp457206"> </a><div style="margin-top: 0pt" class="pCellVariable">
h_id
</div>
</td>
<td><a name="wp457208"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp457210"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Access identifier returned by <b class="cFunctionName">Hstartwrite</b>
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp457212"> </a><div style="margin-top: 0pt" class="pCellVariable">
len
</div>
</td>
<td><a name="wp457214"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp457216"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Length of segment to be written
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp457218"> </a><div style="margin-top: 0pt" class="pCellVariable">
data
</div>
</td>
<td><a name="wp457220"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
IN:
</div>
</td>
<td><a name="wp457222"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Pointer to the data to be written
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<div align="left">
<table border="0" cellpadding="2" cellspacing="8" bgcolor="White" id="wp457225table457223">
<caption></caption>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp457225"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Purpose
</div></td>
<td><a name="wp457227"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Writes the next data segment to a specified data element.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp457229"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Return value
</div></td>
<td><a name="wp457231"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
Returns the length of the segment actually written if successful and <code style="font-family: Courier New; font-size: 8pt" class="cDefName">FAIL</code> (or <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">-1</span>) otherwise.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp457233"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
Description
</div></td>
<td><a name="wp457235"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
<b class="cFunctionName">Hwrite</b> begins writing at the current position of the access identifier, writes the specified number of bytes, then moves the access identifier to the position immediately following the last accessed byte. Calling <b class="cFunctionName">Hwrite</b> with <span style="color: #000000; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">length</span> = <span style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-transform: none; vertical-align: baseline" class="cDefault">0</span> results in an error condition. To reposition an access identifier before writing data, use <b class="cFunctionName">Hseek</b>.
</div>
</td>
</tr>
<tr align="left" valign="top"> <td><td nowrap>
<a name="wp457237"> </a><div style="font-style: normal; margin-bottom: 0pt; margin-top: 0pt; text-transform: none" class="pCellHeadingWW">
 
</div></td>
<td><a name="wp457239"> </a><div style="margin-bottom: 0pt; margin-top: 0pt" class="pCellDescription">
If the space allocated in the data element is smaller than the length of data, the data is truncated to the length of the data element. Although only one access identifier is allowed per data element, it is possible to interlace writes to more than one data element in a file.
</div>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
</blockquote>
<hr />
<table id="SummaryNotReq2" border="0" width="850" cellspacing="0" cellpadding="0">
<tr>
<td align="left">
HDF4.2r4 - February 2009<br/>
<a href="RM_Copyright.html">Copyright</a>
<td align="right">
<span style="font-size: 12px; font-weight: bold">
The HDF Group<br />
</span>
<span style="font-size: 12px">
<a href="http://www.hdfgroup.org">www.hdfgroup.org</a><br />
<img valign="bottom" border="0" src="images/help.jpg" height="12" alt="The HDF Group" valign="top" />
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