| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <title>GFileIOStream: GIO Reference Manual</title> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> |
| <link rel="home" href="index.html" title="GIO Reference Manual"> |
| <link rel="up" href="streaming.html" title="Streaming I/O"> |
| <link rel="prev" href="GFileOutputStream.html" title="GFileOutputStream"> |
| <link rel="next" href="GFileDescriptorBased.html" title="GFileDescriptorBased"> |
| <meta name="generator" content="GTK-Doc V1.25.1 (XML mode)"> |
| <link rel="stylesheet" href="style.css" type="text/css"> |
| </head> |
| <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> |
| <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> |
| <td width="100%" align="left" class="shortcuts"> |
| <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> |
| <a href="#GFileIOStream.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> |
| <a href="#GFileIOStream.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_interfaces"> <span class="dim">|</span> |
| <a href="#GFileIOStream.implemented-interfaces" class="shortcut">Implemented Interfaces</a></span> |
| </td> |
| <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> |
| <td><a accesskey="u" href="streaming.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> |
| <td><a accesskey="p" href="GFileOutputStream.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> |
| <td><a accesskey="n" href="GFileDescriptorBased.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> |
| </tr></table> |
| <div class="refentry"> |
| <a name="GFileIOStream"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="GFileIOStream.top_of_page"></a>GFileIOStream</span></h2> |
| <p>GFileIOStream — File read and write streaming operations</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.functions"></a><h2>Functions</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="functions_return"> |
| <col class="functions_name"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">char</span> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GFileIOStream.html#g-file-io-stream-get-etag" title="g_file_io_stream_get_etag ()">g_file_io_stream_get_etag</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a class="link" href="GFileInfo.html" title="GFileInfo"><span class="returnvalue">GFileInfo</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GFileIOStream.html#g-file-io-stream-query-info" title="g_file_io_stream_query_info ()">g_file_io_stream_query_info</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GFileIOStream.html#g-file-io-stream-query-info-async" title="g_file_io_stream_query_info_async ()">g_file_io_stream_query_info_async</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a class="link" href="GFileInfo.html" title="GFileInfo"><span class="returnvalue">GFileInfo</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GFileIOStream.html#g-file-io-stream-query-info-finish" title="g_file_io_stream_query_info_finish ()">g_file_io_stream_query_info_finish</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.other"></a><h2>Types and Values</h2> |
| <div class="informaltable"><table class="informaltable" 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="GFileIOStream.html#GFileIOStream-struct" title="GFileIOStream">GFileIOStream</a></td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.object-hierarchy"></a><h2>Object Hierarchy</h2> |
| <pre class="screen"> <a href="../gobject-The-Base-Object-Type.html#GObject-struct">GObject</a> |
| <span class="lineart">╰──</span> <a class="link" href="GIOStream.html" title="GIOStream">GIOStream</a> |
| <span class="lineart">╰──</span> GFileIOStream |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.implemented-interfaces"></a><h2>Implemented Interfaces</h2> |
| <p> |
| GFileIOStream implements |
| <a class="link" href="GSeekable.html" title="GSeekable">GSeekable</a>.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <gio/gio.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.description"></a><h2>Description</h2> |
| <p>GFileIOStream provides io streams that both read and write to the same |
| file handle.</p> |
| <p>GFileIOStream implements <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a>, which allows the io |
| stream to jump to arbitrary positions in the file and to truncate |
| the file, provided the filesystem of the file supports these |
| operations.</p> |
| <p>To find the position of a file io stream, use |
| <a class="link" href="GSeekable.html#g-seekable-tell" title="g_seekable_tell ()"><code class="function">g_seekable_tell()</code></a>.</p> |
| <p>To find out if a file io stream supports seeking, use <a class="link" href="GSeekable.html#g-seekable-can-seek" title="g_seekable_can_seek ()"><code class="function">g_seekable_can_seek()</code></a>. |
| To position a file io stream, use <a class="link" href="GSeekable.html#g-seekable-seek" title="g_seekable_seek ()"><code class="function">g_seekable_seek()</code></a>. |
| To find out if a file io stream supports truncating, use |
| <a class="link" href="GSeekable.html#g-seekable-can-truncate" title="g_seekable_can_truncate ()"><code class="function">g_seekable_can_truncate()</code></a>. To truncate a file io |
| stream, use <a class="link" href="GSeekable.html#g-seekable-truncate" title="g_seekable_truncate ()"><code class="function">g_seekable_truncate()</code></a>.</p> |
| <p>The default implementation of all the <a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a> operations |
| and the implementation of <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> just call into the same operations |
| on the output stream.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <a name="g-file-io-stream-get-etag"></a><h3>g_file_io_stream_get_etag ()</h3> |
| <pre class="programlisting"><span class="returnvalue">char</span> * |
| g_file_io_stream_get_etag (<em class="parameter"><code><a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a> *stream</code></em>);</pre> |
| <p>Gets the entity tag for the file when it has been written. |
| This must be called after the stream has been written |
| and closed, as the etag can change while writing.</p> |
| <div class="refsect3"> |
| <a name="g-file-io-stream-get-etag.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" 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>stream</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a>.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="g-file-io-stream-get-etag.returns"></a><h4>Returns</h4> |
| <p> the entity tag for the stream.</p> |
| </div> |
| <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="g-file-io-stream-query-info"></a><h3>g_file_io_stream_query_info ()</h3> |
| <pre class="programlisting"><a class="link" href="GFileInfo.html" title="GFileInfo"><span class="returnvalue">GFileInfo</span></a> * |
| g_file_io_stream_query_info (<em class="parameter"><code><a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a> *stream</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *attributes</code></em>, |
| <em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>, |
| <em class="parameter"><code><a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre> |
| <p>Queries a file io stream for the given <em class="parameter"><code>attributes</code></em> |
| . |
| This function blocks while querying the stream. For the asynchronous |
| version of this function, see <a class="link" href="GFileIOStream.html#g-file-io-stream-query-info-async" title="g_file_io_stream_query_info_async ()"><code class="function">g_file_io_stream_query_info_async()</code></a>. |
| While the stream is blocked, the stream will set the pending flag |
| internally, and any other operations on the stream will fail with |
| <a class="link" href="gio-GIOError.html#G-IO-ERROR-PENDING:CAPS"><code class="literal">G_IO_ERROR_PENDING</code></a>.</p> |
| <p>Can fail if the stream was already closed (with <em class="parameter"><code>error</code></em> |
| being set to |
| <a class="link" href="gio-GIOError.html#G-IO-ERROR-CLOSED:CAPS"><code class="literal">G_IO_ERROR_CLOSED</code></a>), the stream has pending operations (with <em class="parameter"><code>error</code></em> |
| being |
| set to <a class="link" href="gio-GIOError.html#G-IO-ERROR-PENDING:CAPS"><code class="literal">G_IO_ERROR_PENDING</code></a>), or if querying info is not supported for |
| the stream's interface (with <em class="parameter"><code>error</code></em> |
| being set to <a class="link" href="gio-GIOError.html#G-IO-ERROR-NOT-SUPPORTED:CAPS"><code class="literal">G_IO_ERROR_NOT_SUPPORTED</code></a>). I |
| all cases of failure, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> will be returned.</p> |
| <p>If <em class="parameter"><code>cancellable</code></em> |
| is not <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, then the operation can be cancelled by |
| triggering the cancellable object from another thread. If the operation |
| was cancelled, the error <a class="link" href="gio-GIOError.html#G-IO-ERROR-CANCELLED:CAPS"><code class="literal">G_IO_ERROR_CANCELLED</code></a> will be set, and <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> will |
| be returned.</p> |
| <div class="refsect3"> |
| <a name="g-file-io-stream-query-info.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" 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>stream</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a>.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>attributes</p></td> |
| <td class="parameter_description"><p>a file attribute query string.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>cancellable</p></td> |
| <td class="parameter_description"><p> optional <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> object, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore. </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>error</p></td> |
| <td class="parameter_description"><p>a <a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a>, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="g-file-io-stream-query-info.returns"></a><h4>Returns</h4> |
| <p> a <a class="link" href="GFileInfo.html" title="GFileInfo"><span class="type">GFileInfo</span></a> for the <em class="parameter"><code>stream</code></em> |
| , or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error. </p> |
| <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> |
| </div> |
| <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="g-file-io-stream-query-info-async"></a><h3>g_file_io_stream_query_info_async ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| g_file_io_stream_query_info_async (<em class="parameter"><code><a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a> *stream</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *attributes</code></em>, |
| <em class="parameter"><code><span class="type">int</span> io_priority</code></em>, |
| <em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>, |
| <em class="parameter"><code><a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> callback</code></em>, |
| <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre> |
| <p>Asynchronously queries the <em class="parameter"><code>stream</code></em> |
| for a <a class="link" href="GFileInfo.html" title="GFileInfo"><span class="type">GFileInfo</span></a>. When completed, |
| <em class="parameter"><code>callback</code></em> |
| will be called with a <a class="link" href="GAsyncResult.html" title="GAsyncResult"><span class="type">GAsyncResult</span></a> which can be used to |
| finish the operation with <a class="link" href="GFileIOStream.html#g-file-io-stream-query-info-finish" title="g_file_io_stream_query_info_finish ()"><code class="function">g_file_io_stream_query_info_finish()</code></a>.</p> |
| <p>For the synchronous version of this function, see |
| <a class="link" href="GFileIOStream.html#g-file-io-stream-query-info" title="g_file_io_stream_query_info ()"><code class="function">g_file_io_stream_query_info()</code></a>.</p> |
| <div class="refsect3"> |
| <a name="g-file-io-stream-query-info-async.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" 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>stream</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a>.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>attributes</p></td> |
| <td class="parameter_description"><p>a file attribute query string.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>io_priority</p></td> |
| <td class="parameter_description"><p>the <a class="link" href="gio-GIOScheduler.html" title="GIOScheduler">I/O priority</a> of the request</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>cancellable</p></td> |
| <td class="parameter_description"><p> optional <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> object, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore. </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>callback</p></td> |
| <td class="parameter_description"><p> callback to call when the request is satisfied. </p></td> |
| <td class="parameter_annotations"><span class="annotation">[<acronym title="The callback is valid until first called."><span class="acronym">scope async</span></acronym>]</span></td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>user_data</p></td> |
| <td class="parameter_description"><p> the data to pass to callback function. </p></td> |
| <td class="parameter_annotations"><span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="g-file-io-stream-query-info-finish"></a><h3>g_file_io_stream_query_info_finish ()</h3> |
| <pre class="programlisting"><a class="link" href="GFileInfo.html" title="GFileInfo"><span class="returnvalue">GFileInfo</span></a> * |
| g_file_io_stream_query_info_finish (<em class="parameter"><code><a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a> *stream</code></em>, |
| <em class="parameter"><code><a class="link" href="GAsyncResult.html" title="GAsyncResult"><span class="type">GAsyncResult</span></a> *result</code></em>, |
| <em class="parameter"><code><a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre> |
| <p>Finalizes the asynchronous query started |
| by <a class="link" href="GFileIOStream.html#g-file-io-stream-query-info-async" title="g_file_io_stream_query_info_async ()"><code class="function">g_file_io_stream_query_info_async()</code></a>.</p> |
| <div class="refsect3"> |
| <a name="g-file-io-stream-query-info-finish.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" 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>stream</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a>.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>result</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="GAsyncResult.html" title="GAsyncResult"><span class="type">GAsyncResult</span></a>.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>error</p></td> |
| <td class="parameter_description"><p>a <a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a>, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="g-file-io-stream-query-info-finish.returns"></a><h4>Returns</h4> |
| <p> A <a class="link" href="GFileInfo.html" title="GFileInfo"><span class="type">GFileInfo</span></a> for the finished query. </p> |
| <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> |
| </div> |
| <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GFileIOStream-struct"></a><h3>GFileIOStream</h3> |
| <pre class="programlisting">typedef struct _GFileIOStream GFileIOStream;</pre> |
| <p>A subclass of GIOStream for opened files. This adds |
| a few file-specific operations and seeking and truncating.</p> |
| <p><a class="link" href="GFileIOStream.html" title="GFileIOStream"><span class="type">GFileIOStream</span></a> implements GSeekable.</p> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="GFileIOStream.see-also"></a><h2>See Also</h2> |
| <p><a class="link" href="GIOStream.html" title="GIOStream"><span class="type">GIOStream</span></a>, <a class="link" href="GFileInputStream.html" title="GFileInputStream"><span class="type">GFileInputStream</span></a>, <a class="link" href="GFileOutputStream.html" title="GFileOutputStream"><span class="type">GFileOutputStream</span></a>, <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a></p> |
| </div> |
| </div> |
| <div class="footer"> |
| <hr>Generated by GTK-Doc V1.25.1</div> |
| </body> |
| </html> |
