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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<div class="refentry">
<a name="GDataDownloadStream"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GDataDownloadStream.top_of_page"></a>GDataDownloadStream</span></h2>
<p>GDataDownloadStream — GData download stream object</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GDataDownloadStream.stability-level"></a><h2>Stability Level</h2>
<acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.

The Unstable interface level is a warning that these interfaces are  subject to
change without warning and should not be used in unbundled products.

Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym>, unless otherwise indicated
</div>
<div class="refsect1">
<a name="GDataDownloadStream.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="returnvalue">GInputStream</span></a> *
</td>
<td class="function_name">
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-new" title="gdata_download_stream_new ()">gdata_download_stream_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GDataService.html" title="GDataService"><span class="returnvalue">GDataService</span></a> *
</td>
<td class="function_name">
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-get-service" title="gdata_download_stream_get_service ()">gdata_download_stream_get_service</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="returnvalue">GDataAuthorizationDomain</span></a> *
</td>
<td class="function_name">
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-get-authorization-domain" title="gdata_download_stream_get_authorization_domain ()">gdata_download_stream_get_authorization_domain</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="returnvalue">GCancellable</span></a> *
</td>
<td class="function_name">
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-get-cancellable" title="gdata_download_stream_get_cancellable ()">gdata_download_stream_get_cancellable</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
</td>
<td class="function_name">
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-get-download-uri" title="gdata_download_stream_get_download_uri ()">gdata_download_stream_get_download_uri</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
</td>
<td class="function_name">
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-get-content-type" title="gdata_download_stream_get_content_type ()">gdata_download_stream_get_content_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gssize"><span class="returnvalue">gssize</span></a>
</td>
<td class="function_name">
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-get-content-length" title="gdata_download_stream_get_content_length ()">gdata_download_stream_get_content_length</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GDataDownloadStream.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type">
<a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="type">GDataAuthorizationDomain</span></a> *</td>
<td class="property_name"><a class="link" href="GDataDownloadStream.html#GDataDownloadStream--authorization-domain" title="The “authorization-domain” property">authorization-domain</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
<tr>
<td class="property_type">
<a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> *</td>
<td class="property_name"><a class="link" href="GDataDownloadStream.html#GDataDownloadStream--cancellable" title="The “cancellable” property">cancellable</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
<tr>
<td class="property_type"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#glong"><span class="type">glong</span></a></td>
<td class="property_name"><a class="link" href="GDataDownloadStream.html#GDataDownloadStream--content-length" title="The “content-length” property">content-length</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="GDataDownloadStream.html#GDataDownloadStream--content-type" title="The “content-type” property">content-type</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="GDataDownloadStream.html#GDataDownloadStream--download-uri" title="The “download-uri” property">download-uri</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
<tr>
<td class="property_type">
<a class="link" href="GDataService.html" title="GDataService"><span class="type">GDataService</span></a> *</td>
<td class="property_name"><a class="link" href="GDataDownloadStream.html#GDataDownloadStream--service" title="The “service” property">service</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GDataDownloadStream.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GDataDownloadStream.html#GDataDownloadStream-struct" title="GDataDownloadStream">GDataDownloadStream</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GDataDownloadStream.html#GDataDownloadStreamClass" title="GDataDownloadStreamClass">GDataDownloadStreamClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GDataDownloadStream.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
    <span class="lineart">╰──</span> <a href="https://developer.gnome.org/gio/unstable/GInputStream.html">GInputStream</a>
        <span class="lineart">╰──</span> GDataDownloadStream
</pre>
</div>
<div class="refsect1">
<a name="GDataDownloadStream.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GDataDownloadStream implements
 <a href="https://developer.gnome.org/gio/unstable/GSeekable.html">GSeekable</a>.</p>
</div>
<div class="refsect1">
<a name="GDataDownloadStream.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gdata/gdata-download-stream.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GDataDownloadStream.description"></a><h2>Description</h2>
<p><a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> is a <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> subclass to allow downloading of files from GData services with authorization from a <a class="link" href="GDataService.html" title="GDataService"><span class="type">GDataService</span></a> under
the given <a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="type">GDataAuthorizationDomain</span></a>. If authorization is not required to perform the download, a <a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="type">GDataAuthorizationDomain</span></a> doesn't have to be
specified.</p>
<p>Once a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> is instantiated with <a class="link" href="GDataDownloadStream.html#gdata-download-stream-new" title="gdata_download_stream_new ()"><code class="function">gdata_download_stream_new()</code></a>, the standard <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> API can be used on the stream to download
the file. Network communication may not actually begin until the first call to <a href="https://developer.gnome.org/gio/unstable/GInputStream.html#g-input-stream-read"><code class="function">g_input_stream_read()</code></a>, so having a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> around is no
guarantee that the file is being downloaded.</p>
<p>The content type and length of the file being downloaded are made available through <a class="link" href="GDataDownloadStream.html#GDataDownloadStream--content-type" title="The “content-type” property"><span class="type">“content-type”</span></a> and
<a class="link" href="GDataDownloadStream.html#GDataDownloadStream--content-length" title="The “content-length” property"><span class="type">“content-length”</span></a> as soon as the appropriate data is received from the server. Connect to the
<a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject-notify"><span class="type">“notify”</span></a> <code class="code">content-type</code> and <code class="code">content-length</code> details to be notified as
soon as the data is available.</p>
<p>The entire download operation can be cancelled using the <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> instance provided to <a class="link" href="GDataDownloadStream.html#gdata-download-stream-new" title="gdata_download_stream_new ()"><code class="function">gdata_download_stream_new()</code></a>, or returned by
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-get-cancellable" title="gdata_download_stream_get_cancellable ()"><code class="function">gdata_download_stream_get_cancellable()</code></a>. Cancelling this at any time will cause all future <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> method calls to return
<code class="literal">G_IO_ERROR_CANCELLED</code>. If any <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> methods are in the process of being called, they will be cancelled and return <code class="literal">G_IO_ERROR_CANCELLED</code> as
soon as possible.</p>
<p>Note that cancelling an individual method call (such as a call to <a href="https://developer.gnome.org/gio/unstable/GInputStream.html#g-input-stream-read"><code class="function">g_input_stream_read()</code></a>) using the <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> parameter of the method will not
cancel the download as a whole — just that particular method call. In the case of <a href="https://developer.gnome.org/gio/unstable/GInputStream.html#g-input-stream-read"><code class="function">g_input_stream_read()</code></a>, this will cause it to successfully return
any data that it has in memory at the moment (up to the requested number of bytes), or return a <code class="literal">G_IO_ERROR_CANCELLED</code> if it was blocking on receiving
data from the network. This is also the behaviour of <a href="https://developer.gnome.org/gio/unstable/GInputStream.html#g-input-stream-read"><code class="function">g_input_stream_read()</code></a> when the download operation as a whole is cancelled.</p>
<p>In the case of <a href="https://developer.gnome.org/gio/unstable/GInputStream.html#g-input-stream-close"><code class="function">g_input_stream_close()</code></a>, the call will return immediately if network activity hasn't yet started. If it has, the network activity will
be cancelled, regardless of whether the call to <a href="https://developer.gnome.org/gio/unstable/GInputStream.html#g-input-stream-close"><code class="function">g_input_stream_close()</code></a> is cancelled. Cancelling a pending call to <a href="https://developer.gnome.org/gio/unstable/GInputStream.html#g-input-stream-close"><code class="function">g_input_stream_close()</code></a> (either
using the method's <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a>, or by cancelling the download stream as a whole) will cause it to stop waiting for the network activity to finish,
and return <code class="literal">G_IO_ERROR_CANCELLED</code> immediately. Network activity will continue to be shut down in the background.</p>
<p>If the server returns an error message (for example, if the user is not correctly authenticated/authorized or doesn't have suitable permissions to
download from the given URI), it will be returned as a <a class="link" href="GDataService.html#GDataServiceError" title="enum GDataServiceError"><span class="type">GDataServiceError</span></a> by the first call to <a href="https://developer.gnome.org/gio/unstable/GInputStream.html#g-input-stream-read"><code class="function">g_input_stream_read()</code></a>.</p>
<div class="example">
<a name="id-1.3.2.9.10.9"></a><p class="title"><b>Example 2. Downloading to a File</b></p>
<div class="example-contents">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
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37</pre></td>
        <td class="listing_code"><pre class="programlisting">GDataService <span class="gtkdoc opt">*</span>service<span class="gtkdoc opt">;</span>
GDataAuthorizationDomain <span class="gtkdoc opt">*</span>domain<span class="gtkdoc opt">;</span>
GCancellable <span class="gtkdoc opt">*</span>cancellable<span class="gtkdoc opt">;</span>
GInputStream <span class="gtkdoc opt">*</span>download_stream<span class="gtkdoc opt">;</span>
GOutputStream <span class="gtkdoc opt">*</span>output_stream<span class="gtkdoc opt">;</span>

<span class="comment">/* Create the download stream */</span>
service <span class="gtkdoc opt">=</span> <span class="function">create_my_service</span> <span class="gtkdoc opt">();</span>
domain <span class="gtkdoc opt">=</span> <span class="function">get_my_authorization_domain_from_service</span> <span class="gtkdoc opt">(</span>service<span class="gtkdoc opt">);</span>
cancellable <span class="gtkdoc opt">=</span> <span class="function"><a href="https://developer.gnome.org/gio/unstable/GCancellable.html#g-cancellable-new">g_cancellable_new</a></span> <span class="gtkdoc opt">();</span> <span class="comment">/* cancel this to cancel the entire download operation */</span>
download_stream <span class="gtkdoc opt">=</span> <span class="function"><a href="GDataDownloadStream.html#gdata-download-stream-new">gdata_download_stream_new</a></span> <span class="gtkdoc opt">(</span>service<span class="gtkdoc opt">,</span> domain<span class="gtkdoc opt">,</span> download_uri<span class="gtkdoc opt">,</span> cancellable<span class="gtkdoc opt">);</span>
output_stream <span class="gtkdoc opt">=</span> <span class="function">create_file_and_return_output_stream</span> <span class="gtkdoc opt">();</span>

<span class="comment">/* Perform the download asynchronously */</span>
<span class="function"><a href="https://developer.gnome.org/gio/unstable/GOutputStream.html#g-output-stream-splice-async">g_output_stream_splice_async</a></span> <span class="gtkdoc opt">(</span>output_stream<span class="gtkdoc opt">,</span> download_stream<span class="gtkdoc opt">,</span> G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE <span class="gtkdoc opt">|</span> G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET<span class="gtkdoc opt">,</span>
                              G_PRIORITY_DEFAULT<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">, (</span>GAsyncReadyCallback<span class="gtkdoc opt">)</span> download_splice_cb<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>

<span class="function"><a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>output_stream<span class="gtkdoc opt">);</span>
<span class="function"><a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>download_stream<span class="gtkdoc opt">);</span>
<span class="function"><a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>cancellable<span class="gtkdoc opt">);</span>
<span class="function"><a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>domain<span class="gtkdoc opt">);</span>
<span class="function"><a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>service<span class="gtkdoc opt">);</span>

<span class="gtkdoc kwb">static void</span>
<span class="function">download_splice_cb</span> <span class="gtkdoc opt">(</span>GOutputStream <span class="gtkdoc opt">*</span>output_stream<span class="gtkdoc opt">,</span> GAsyncResult <span class="gtkdoc opt">*</span>result<span class="gtkdoc opt">,</span> gpointer user_data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
	GError <span class="gtkdoc opt">*</span>error <span class="gtkdoc opt">=</span> NULL<span class="gtkdoc opt">;</span>

	<span class="function"><a href="https://developer.gnome.org/gio/unstable/GOutputStream.html#g-output-stream-splice-finish">g_output_stream_splice_finish</a></span> <span class="gtkdoc opt">(</span>output_stream<span class="gtkdoc opt">,</span> result<span class="gtkdoc opt">, &amp;</span>error<span class="gtkdoc opt">);</span>

	<span class="keyword">if</span> <span class="gtkdoc opt">(</span>error <span class="gtkdoc opt">!=</span> NULL <span class="gtkdoc opt">&amp;&amp;</span> <span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#g-error-matches">g_error_matches</a></span> <span class="gtkdoc opt">(</span>error<span class="gtkdoc opt">,</span> G_IO_ERROR<span class="gtkdoc opt">,</span> G_IO_ERROR_CANCELLED<span class="gtkdoc opt">) ==</span> FALSE<span class="gtkdoc opt">)) {</span>
		<span class="comment">/* Error downloading the file; potentially an I/O error (GIOError), or an error response from the server</span>
<span class="comment">		 * (GDataServiceError). You might want to delete the newly created file because of the error. */</span>
		<span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Message-Logging.html#g-error">g_error</a></span> <span class="gtkdoc opt">(</span><span class="string">&quot;Error downloading file: %s&quot;</span><span class="gtkdoc opt">,</span> error<span class="gtkdoc opt">-&gt;</span>message<span class="gtkdoc opt">);</span>
		<span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#g-error-free">g_error_free</a></span> <span class="gtkdoc opt">(</span>error<span class="gtkdoc opt">);</span>
	<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">}</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

</div>
<br class="example-break">
</div>
<div class="refsect1">
<a name="GDataDownloadStream.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gdata-download-stream-new"></a><h3>gdata_download_stream_new ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="returnvalue">GInputStream</span></a> *
gdata_download_stream_new (<em class="parameter"><code><a class="link" href="GDataService.html" title="GDataService"><span class="type">GDataService</span></a> *service</code></em>,
                           <em class="parameter"><code><a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="type">GDataAuthorizationDomain</span></a> *domain</code></em>,
                           <em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *download_uri</code></em>,
                           <em class="parameter"><code><a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> *cancellable</code></em>);</pre>
<p>Creates a new <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a>, allowing a file to be downloaded from a GData service using standard <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> API.</p>
<p>As well as the standard GIO errors, calls to the <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> API on a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> can also return any relevant specific error from
<a class="link" href="GDataService.html#GDataServiceError" title="enum GDataServiceError"><span class="type">GDataServiceError</span></a>, or <a class="link" href="GDataService.html#GDATA-SERVICE-ERROR-PROTOCOL-ERROR:CAPS"><code class="literal">GDATA_SERVICE_ERROR_PROTOCOL_ERROR</code></a> in the general case.</p>
<p>If a <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> is provided in <em class="parameter"><code>cancellable</code></em>
, the download operation may be cancelled at any time from another thread using <a href="https://developer.gnome.org/gio/unstable/GCancellable.html#g-cancellable-cancel"><code class="function">g_cancellable_cancel()</code></a>.
In this case, any ongoing network activity will be stopped, and any pending or future calls to <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> API on the <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> will
return <code class="literal">G_IO_ERROR_CANCELLED</code>. Note that the <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> objects which can be passed to individual <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> operations will not cancel the
download operation proper if cancelled — they will merely cancel that API call. The only way to cancel the download operation completely is using
this <em class="parameter"><code>cancellable</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.2.9.11.2.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>service</p></td>
<td class="parameter_description"><p>a <a class="link" href="GDataService.html" title="GDataService"><span class="type">GDataService</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>domain</p></td>
<td class="parameter_description"><p> the <a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="type">GDataAuthorizationDomain</span></a> to authorize the download, or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>download_uri</p></td>
<td class="parameter_description"><p>the URI to download</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p> a <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> for the entire download stream, or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.2.9.11.2.8"></a><h4>Returns</h4>
<p> a new <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a>, or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>; unref with <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a></p>
<p></p>
</div>
<p class="since">Since 0.9.0</p>
</div>
<hr>
<div class="refsect2">
<a name="gdata-download-stream-get-service"></a><h3>gdata_download_stream_get_service ()</h3>
<pre class="programlisting"><a class="link" href="GDataService.html" title="GDataService"><span class="returnvalue">GDataService</span></a> *
gdata_download_stream_get_service (<em class="parameter"><code><a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> *self</code></em>);</pre>
<p>Gets the service used to authorize the download, as passed to <a class="link" href="GDataDownloadStream.html#gdata-download-stream-new" title="gdata_download_stream_new ()"><code class="function">gdata_download_stream_new()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.2.9.11.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>self</p></td>
<td class="parameter_description"><p>a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.2.9.11.3.6"></a><h4>Returns</h4>
<p> the <a class="link" href="GDataService.html" title="GDataService"><span class="type">GDataService</span></a> used to authorize the download. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since 0.5.0</p>
</div>
<hr>
<div class="refsect2">
<a name="gdata-download-stream-get-authorization-domain"></a><h3>gdata_download_stream_get_authorization_domain ()</h3>
<pre class="programlisting"><a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="returnvalue">GDataAuthorizationDomain</span></a> *
gdata_download_stream_get_authorization_domain
                               (<em class="parameter"><code><a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> *self</code></em>);</pre>
<p>Gets the authorization domain used to authorize the download, as passed to <a class="link" href="GDataDownloadStream.html#gdata-download-stream-new" title="gdata_download_stream_new ()"><code class="function">gdata_download_stream_new()</code></a>. It may be <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if authorization is not
needed for the download.</p>
<div class="refsect3">
<a name="id-1.3.2.9.11.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>self</p></td>
<td class="parameter_description"><p>a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.2.9.11.4.6"></a><h4>Returns</h4>
<p> the <a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="type">GDataAuthorizationDomain</span></a> used to authorize the download, or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></p>
</div>
<p class="since">Since 0.9.0</p>
</div>
<hr>
<div class="refsect2">
<a name="gdata-download-stream-get-cancellable"></a><h3>gdata_download_stream_get_cancellable ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="returnvalue">GCancellable</span></a> *
gdata_download_stream_get_cancellable (<em class="parameter"><code><a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> *self</code></em>);</pre>
<p>Gets the <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> for the entire download operation, <a class="link" href="GDataDownloadStream.html#GDataDownloadStream--cancellable" title="The “cancellable” property"><span class="type">“cancellable”</span></a>.</p>
<div class="refsect3">
<a name="id-1.3.2.9.11.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>self</p></td>
<td class="parameter_description"><p>a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.2.9.11.5.6"></a><h4>Returns</h4>
<p> the <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> for the entire download operation. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since 0.8.0</p>
</div>
<hr>
<div class="refsect2">
<a name="gdata-download-stream-get-download-uri"></a><h3>gdata_download_stream_get_download_uri ()</h3>
<pre class="programlisting">const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
gdata_download_stream_get_download_uri
                               (<em class="parameter"><code><a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> *self</code></em>);</pre>
<p>Gets the URI of the file being downloaded, as passed to <a class="link" href="GDataDownloadStream.html#gdata-download-stream-new" title="gdata_download_stream_new ()"><code class="function">gdata_download_stream_new()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.2.9.11.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>self</p></td>
<td class="parameter_description"><p>a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.2.9.11.6.6"></a><h4>Returns</h4>
<p> the URI of the file being downloaded</p>
<p></p>
</div>
<p class="since">Since 0.5.0</p>
</div>
<hr>
<div class="refsect2">
<a name="gdata-download-stream-get-content-type"></a><h3>gdata_download_stream_get_content_type ()</h3>
<pre class="programlisting">const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
gdata_download_stream_get_content_type
                               (<em class="parameter"><code><a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> *self</code></em>);</pre>
<p>Gets the content type of the file being downloaded. If the <code class="literal">Content-Type</code> header has not yet
been received, <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> will be returned.</p>
<div class="refsect3">
<a name="id-1.3.2.9.11.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>self</p></td>
<td class="parameter_description"><p>a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.2.9.11.7.6"></a><h4>Returns</h4>
<p> the content type of the file being downloaded, or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p>
<p></p>
</div>
<p class="since">Since 0.5.0</p>
</div>
<hr>
<div class="refsect2">
<a name="gdata-download-stream-get-content-length"></a><h3>gdata_download_stream_get_content_length ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gssize"><span class="returnvalue">gssize</span></a>
gdata_download_stream_get_content_length
                               (<em class="parameter"><code><a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> *self</code></em>);</pre>
<p>Gets the length (in bytes) of the file being downloaded. If the <code class="literal">Content-Length</code> header has not yet
been received from the server, <code class="code">-1</code> will be returned.</p>
<div class="refsect3">
<a name="id-1.3.2.9.11.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>self</p></td>
<td class="parameter_description"><p>a <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.2.9.11.8.6"></a><h4>Returns</h4>
<p> the content length of the file being downloaded, or <code class="code">-1</code></p>
<p></p>
</div>
<p class="since">Since 0.5.0</p>
</div>
</div>
<div class="refsect1">
<a name="GDataDownloadStream.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GDataDownloadStream-struct"></a><h3>GDataDownloadStream</h3>
<pre class="programlisting">typedef struct _GDataDownloadStream GDataDownloadStream;</pre>
<p>All the fields in the <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> structure are private and should never be accessed directly.</p>
<p class="since">Since 0.5.0</p>
</div>
<hr>
<div class="refsect2">
<a name="GDataDownloadStreamClass"></a><h3>GDataDownloadStreamClass</h3>
<pre class="programlisting">typedef struct {
} GDataDownloadStreamClass;
</pre>
<p>All the fields in the <a class="link" href="GDataDownloadStream.html#GDataDownloadStreamClass" title="GDataDownloadStreamClass"><span class="type">GDataDownloadStreamClass</span></a> structure are private and should never be accessed directly.</p>
<p class="since">Since 0.5.0</p>
</div>
</div>
<div class="refsect1">
<a name="GDataDownloadStream.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GDataDownloadStream--authorization-domain"></a><h3>The <code class="literal">“authorization-domain”</code> property</h3>
<pre class="programlisting">  “authorization-domain”     <a class="link" href="GDataAuthorizationDomain.html" title="GDataAuthorizationDomain"><span class="type">GDataAuthorizationDomain</span></a> *</pre>
<p>The authorization domain for the download, against which the <a class="link" href="GDataService.html#GDataService--authorizer" title="The “authorizer” property"><span class="type">“authorizer”</span></a> for the <a class="link" href="GDataDownloadStream.html#GDataDownloadStream--service" title="The “service” property"><span class="type">“service”</span></a> should be
authorized. This may be <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if authorization is not needed for the download.</p>
<p>Flags: Read / Write / Construct Only</p>
<p class="since">Since 0.9.0</p>
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<div class="refsect2">
<a name="GDataDownloadStream--cancellable"></a><h3>The <code class="literal">“cancellable”</code> property</h3>
<pre class="programlisting">  “cancellable”              <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> *</pre>
<p>An optional cancellable used to cancel the entire download operation. If a <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> instance isn't provided for this property at
construction time (i.e. to <a class="link" href="GDataDownloadStream.html#gdata-download-stream-new" title="gdata_download_stream_new ()"><code class="function">gdata_download_stream_new()</code></a>), one will be created internally and can be retrieved using
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-get-cancellable" title="gdata_download_stream_get_cancellable ()"><code class="function">gdata_download_stream_get_cancellable()</code></a> and used to cancel the download operation with <a href="https://developer.gnome.org/gio/unstable/GCancellable.html#g-cancellable-cancel"><code class="function">g_cancellable_cancel()</code></a> just as if it was passed to
<a class="link" href="GDataDownloadStream.html#gdata-download-stream-new" title="gdata_download_stream_new ()"><code class="function">gdata_download_stream_new()</code></a>.</p>
<p>If the download operation is cancelled using this <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a>, any ongoing network activity will be stopped, and any pending or future
calls to <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> API on the <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> will return <code class="literal">G_IO_ERROR_CANCELLED</code>. Note that the <a href="https://developer.gnome.org/gio/unstable/GCancellable.html"><span class="type">GCancellable</span></a> objects which can be
passed to individual <a href="https://developer.gnome.org/gio/unstable/GInputStream.html"><span class="type">GInputStream</span></a> operations will not cancel the download operation proper if cancelled — they will merely cancel that API
call. The only way to cancel the download operation completely is using <a class="link" href="GDataDownloadStream.html#GDataDownloadStream--cancellable" title="The “cancellable” property"><span class="type">“cancellable”</span></a>.</p>
<p>Flags: Read / Write / Construct Only</p>
<p class="since">Since 0.8.0</p>
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<div class="refsect2">
<a name="GDataDownloadStream--content-length"></a><h3>The <code class="literal">“content-length”</code> property</h3>
<pre class="programlisting">  “content-length”           <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#glong"><span class="type">glong</span></a></pre>
<p>The length (in bytes) of the file being downloaded. This will initially be <code class="code">-1</code>, and will be populated as soon as
the appropriate header is received from the server. Its value will never change after this.</p>
<p>Note that change notifications for this property (<a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject-notify"><span class="type">“notify”</span></a> emissions) may be emitted in threads other than the one which created
the <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a>. It is the client's responsibility to ensure that any notification signal handlers are either multi-thread safe
or marshal the notification to the thread which owns the <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> as appropriate.</p>
<p>Flags: Read</p>
<p>Allowed values: &gt;= -1</p>
<p>Default value: -1</p>
<p class="since">Since 0.5.0</p>
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<div class="refsect2">
<a name="GDataDownloadStream--content-type"></a><h3>The <code class="literal">“content-type”</code> property</h3>
<pre class="programlisting">  “content-type”             <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>The content type of the file being downloaded. This will initially be <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, and will be populated as soon as the appropriate header is
received from the server. Its value will never change after this.</p>
<p>Note that change notifications for this property (<a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject-notify"><span class="type">“notify”</span></a> emissions) may be emitted in threads other than the one which created
the <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a>. It is the client's responsibility to ensure that any notification signal handlers are either multi-thread safe
or marshal the notification to the thread which owns the <a class="link" href="GDataDownloadStream.html" title="GDataDownloadStream"><span class="type">GDataDownloadStream</span></a> as appropriate.</p>
<p>Flags: Read</p>
<p>Default value: NULL</p>
<p class="since">Since 0.5.0</p>
</div>
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<div class="refsect2">
<a name="GDataDownloadStream--download-uri"></a><h3>The <code class="literal">“download-uri”</code> property</h3>
<pre class="programlisting">  “download-uri”             <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>The URI of the file to download.</p>
<p>Flags: Read / Write / Construct Only</p>
<p>Default value: NULL</p>
<p class="since">Since 0.5.0</p>
</div>
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<div class="refsect2">
<a name="GDataDownloadStream--service"></a><h3>The <code class="literal">“service”</code> property</h3>
<pre class="programlisting">  “service”                  <a class="link" href="GDataService.html" title="GDataService"><span class="type">GDataService</span></a> *</pre>
<p>The service which is used to authorize the download, and to which the download relates.</p>
<p>Flags: Read / Write / Construct Only</p>
<p class="since">Since 0.5.0</p>
</div>
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