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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>gio.FileInputStream</title><link rel="stylesheet" type="text/css" href="style.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"><link rel="home" href="index.html" title="PyGObject Reference Manual"><link rel="up" href="gio-class-reference.html" title="PyGio Class Reference"><link rel="prev" href="class-giofileinfo.html" title="gio.FileInfo"><link rel="next" href="class-giofilemonitor.html" title="gio.FileMonitor"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">gio.FileInputStream</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="class-giofileinfo.html">Prev</a> </td><th width="60%" align="center">PyGio Class Reference</th><td width="20%" align="right"> <a accesskey="n" href="class-giofilemonitor.html">Next</a></td></tr></table><hr></div><div class="refentry" title="gio.FileInputStream"><a name="class-giofileinputstream"></a><div class="titlepage"></div><div class="refnamediv"><h2>gio.FileInputStream</h2><p>gio.FileInputStream — Base class for implementing streaming input</p></div><div class="refsect1" title="Synopsis"><a name="id511851"></a><h2>Synopsis</h2><table bgcolor="#D0E0F0" width="100%"><tr><td><pre class="classsynopsis">class <span class="ooclass"><span class="classname">gio.FileInputStream</span></span>(<span class="ooclass"><span class="classname"><a class="link" href="class-gioinputstream.html" title="gio.InputStream">gio.InputStream</a></span></span>):
<code class="methodsynopsis"> def <span class="methodname"><a class="link" href="class-giofileinputstream.html#method-giofileinputstream--query-info" title="gio.FileInputStream.query_info">query_info</a></span>(<span class="methodparam"><span class="parameter"><strong class="parameter"><code>attributes</code></strong></span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>cancellable</code></strong></span><span class="initializer">=None</span></span>)</code><br><code class="methodsynopsis"> def <span class="methodname"><a class="link" href="class-giofileinputstream.html#method-giofileinputstream--query-info-async" title="gio.FileInputStream.query_info_async">query_info_async</a></span>(<span class="methodparam"><span class="parameter"><strong class="parameter"><code>attributes</code></strong></span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>callback</code></strong></span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>io_priority</code></strong></span><span class="initializer">=glib.PRIORITY_DEFAULT</span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>cancellable</code></strong></span><span class="initializer">=None</span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>user_data</code></strong></span><span class="initializer">=None</span></span>)</code><br><code class="methodsynopsis"> def <span class="methodname"><a class="link" href="class-giofileinputstream.html#method-giofileinputstream--query-info-finish" title="gio.FileInputStream.query_info_finish">query_info_finish</a></span>(<span class="methodparam"><span class="parameter"><strong class="parameter"><code>result</code></strong></span></span>)</code><br></pre></td></tr></table></div><div class="refsect1" title="Ancestry"><a name="id512018"></a><h2>Ancestry</h2><pre class="synopsis">+-- <a class="link" href="class-gobject.html" title="gobject.GObject">gobject.GObject</a>
+-- <a class="link" href="class-gioinputstream.html" title="gio.InputStream">gio.InputStream</a>
+-- <a class="link" href="class-giofileinputstream.html" title="gio.FileInputStream">gio.FileInputStream</a>
</pre></div><div class="refsect1" title="Implemented Interfaces"><a name="id512045"></a><h2>Implemented Interfaces</h2><p>
<a class="link" href="class-giofileinputstream.html" title="gio.FileInputStream"><code class="classname">gio.FileInputStream</code></a>
implements
<a class="link" href="class-gioseekable.html" title="gio.Seekable"><code class="classname">gio.Seekable</code></a>
</p></div><div class="refsect1" title="Description"><a name="id512067"></a><h2>Description</h2><p>
<a class="link" href="class-giofileinputstream.html" title="gio.FileInputStream"><code class="classname">gio.FileInputStream</code></a>
provides input streams that take their content from a file.
</p><p>
<a class="link" href="class-giofileinputstream.html" title="gio.FileInputStream"><code class="classname">gio.FileInputStream</code></a>
implements <a class="link" href="class-gioseekable.html" title="gio.Seekable"><code class="classname">gio.Seekable</code></a>,
which allows the input stream to jump to arbitrary positions in the file, provided the filesystem
of the file allows it. In addition to the generic g_seekable_ API,
<a class="link" href="class-giofileinputstream.html" title="gio.FileInputStream"><code class="classname">gio.FileInputStream</code></a>
has its own API for seeking and positioning. To find the position of a file input stream, use
<code class="methodname"><a class="link" href="class-gioseekable.html#method-gioseekable--tell" title="gio.Seekable.tell">gio.Seekable.tell</a></code>().
To find out if a file input stream supports seeking, use
<code class="methodname"><a class="link" href="class-gioseekable.html#method-gioseekable--can_seek" title="gio.Seekable.can_seek">gio.Seekable.can_seek</a></code>().
To position a file input stream, use
<code class="methodname"><a class="link" href="class-gioseekable.html#method-gioseekable--seek" title="gio.Seekable.seek">gio.Seekable.seek</a></code>().
</p></div><div class="refsect1" title="Methods"><a name="id512126"></a><h2>Methods</h2><div class="refsect2" title="gio.FileInputStream.query_info"><a name="method-giofileinputstream--query-info"></a><h3>gio.FileInputStream.query_info</h3><pre class="programlisting"><code class="methodsynopsis"> def <span class="methodname">query_info</span>(<span class="methodparam"><span class="parameter"><strong class="parameter"><code>attributes</code></strong></span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>cancellable</code></strong></span><span class="initializer">=None</span></span>)</code></pre><table border="0" width="100%" bgcolor="#FFECCE"><col align="left" valign="top" width="0*"><tbody><tr><td><p><span class="term"><strong class="parameter"><code>attributes</code></strong> :</span></p></td><td>a file attribute query string.
</td></tr><tr><td><p><span class="term"><strong class="parameter"><code>cancellable</code></strong> :</span></p></td><td>optional
<a class="link" href="class-giocancellable.html" title="gio.Cancellable"><code class="classname">gio.Cancellable</code></a>
object, <code class="literal">None</code> to ignore.
</td></tr><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td>a <a class="link" href="class-giofileinfo.html" title="gio.FileInfo"><code class="classname">gio.FileInfo</code></a>,
or <code class="literal">None</code> on error.
</td></tr></tbody></table><p>
The <code class="methodname">query_info</code>() method queries a file input stream
the given attributes. This function blocks while querying the stream.
For the asynchronous (non-blocking) version of this function, see
<code class="methodname"><a class="link" href="class-giofileinputstream.html#method-giofileinputstream--query-info-async" title="gio.FileInputStream.query_info_async">gio.FileInputStream.query_info_async</a></code>().
While the stream is blocked, the stream will set the pending flag internally,
and any other operations on the stream will fail with gio.ERROR_PENDING.
</p></div><div class="refsect2" title="gio.FileInputStream.query_info_async"><a name="method-giofileinputstream--query-info-async"></a><h3>gio.FileInputStream.query_info_async</h3><pre class="programlisting"><code class="methodsynopsis"> def <span class="methodname">query_info_async</span>(<span class="methodparam"><span class="parameter"><strong class="parameter"><code>attributes</code></strong></span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>callback</code></strong></span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>io_priority</code></strong></span><span class="initializer">=glib.PRIORITY_DEFAULT</span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>cancellable</code></strong></span><span class="initializer">=None</span></span>, <span class="methodparam"><span class="parameter"><strong class="parameter"><code>user_data</code></strong></span><span class="initializer">=None</span></span>)</code></pre><table border="0" width="100%" bgcolor="#FFECCE"><col align="left" valign="top" width="0*"><tbody><tr><td><p><span class="term"><strong class="parameter"><code>attributes</code></strong> :</span></p></td><td>a file attribute query string.
</td></tr><tr><td><p><span class="term"><em class="parameter"><code>callback</code></em> :</span></p></td><td>a GAsyncReadyCallback to call when the request is satisfied.
</td></tr><tr><td><p><span class="term"><em class="parameter"><code>io_priority</code></em> :</span></p></td><td>the
<a class="xref" href="glib-constants.html#glib-priority-constants" title="Glib Priority Constants">Glib Priority Constants</a>
of the request.
</td></tr><tr><td><p><span class="term"><em class="parameter"><code>cancellable</code></em> :</span></p></td><td>optional
<a class="link" href="class-giocancellable.html" title="gio.Cancellable"><code class="classname">gio.Cancellable</code></a>
object, <code class="literal">None</code> to ignore.</td></tr><tr><td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td><td>the data to pass to callback function.
</td></tr></tbody></table><p>
The <code class="methodname">query_info_async</code>() method queries the stream
information asynchronously. When the operation is finished callback will be
called. You can then call
<code class="methodname"><a class="link" href="class-giofileinputstream.html#method-giofileinputstream--query-info-finish" title="gio.FileInputStream.query_info_finish">gio.FileInputStream.query_info_finish</a></code>()
to get the result of the operation.
</p><p>
For the synchronous version of this function, see
<code class="methodname"><a class="link" href="class-giofileinputstream.html#method-giofileinputstream--query-info" title="gio.FileInputStream.query_info">gio.FileInputStream.query_info</a></code>().
</p><p>
If cancellable is not <code class="literal">None</code>, then the operation can be cancelled
by triggering the cancellable object from another thread. If the operation was
cancelled, the error gio.ERROR_CANCELLED will be set
</p></div><div class="refsect2" title="gio.FileInputStream.query_info_finish"><a name="method-giofileinputstream--query-info-finish"></a><h3>gio.FileInputStream.query_info_finish</h3><pre class="programlisting"><code class="methodsynopsis"> def <span class="methodname">query_info_finish</span>(<span class="methodparam"><span class="parameter"><strong class="parameter"><code>result</code></strong></span></span>)</code></pre><table border="0" width="100%" bgcolor="#FFECCE"><col align="left" valign="top" width="0*"><tbody><tr><td><p><span class="term"><strong class="parameter"><code>result</code></strong> :</span></p></td><td>a <a class="link" href="class-gioasyncresult.html" title="gio.AsyncResult"><code class="classname">gio.AsyncResult</code></a>.
</td></tr><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td>a <a class="link" href="class-giofileinfo.html" title="gio.FileInfo"><code class="classname">gio.FileInfo</code></a>,
or <code class="literal">None</code> on error.
</td></tr></tbody></table><p>
The <code class="methodname">query_info_finish</code>() method finishes an asynchronous
file append operation started with
<code class="methodname"><a class="link" href="class-giofileinputstream.html#method-giofileinputstream--query-info-async" title="gio.FileInputStream.query_info_async">gio.FileInputStream.query_info_async</a></code>().
</p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="class-giofileinfo.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="gio-class-reference.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="class-giofilemonitor.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">gio.FileInfo </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> gio.FileMonitor</td></tr></table></div></body></html>
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