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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"><title>GSeekable</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="GIO Reference Manual"><link rel="up" href="streaming.html" title="Streaming I/O"><link rel="prev" href="streaming.html" title="Streaming I/O"><link rel="next" href="GInputStream.html" title="GInputStream"><meta name="generator" content="GTK-Doc V1.9 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="part" href="pt01.html" title="Part I. GIO Overview"><link rel="chapter" href="ch01.html" title="Introduction"><link rel="chapter" href="ch02.html" title="Compiling GIO applications"><link rel="chapter" href="ch03.html" title="Running GIO applications"><link rel="chapter" href="gio-extension-points.html" title="Extending GIO"><link rel="part" href="pt02.html" title="Part II. API Reference"><link rel="chapter" href="file_ops.html" title="File Operations"><link rel="chapter" href="file_mon.html" title="File System Monitoring"><link rel="chapter" href="async.html" title="Asynchronous I/O"><link rel="chapter" href="streaming.html" title="Streaming I/O"><link rel="chapter" href="types.html" title="File types and applications"><link rel="chapter" href="volume_mon.html" title="Volumes and Drives"><link rel="chapter" href="icons.html" title="Icons"><link rel="chapter" href="utils.html" title="Utilities"><link rel="chapter" href="extending.html" title="Extending GIO"><link rel="part" href="migrating.html" title="Part III. Migrating to GIO"><link rel="chapter" href="ch14.html" title="Migrating from POSIX to GIO"><link rel="chapter" href="ch15.html" title="Migrating from GnomeVFS to GIO"><link rel="chapter" href="gio-hierarchy.html" title="Object Hierarchy"><link rel="index" href="ix01.html" title="Index"></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="2"><tr valign="middle"><td><a accesskey="p" href="streaming.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="streaming.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GIO Reference Manual</th><td><a accesskey="n" href="GInputStream.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr><tr><td colspan="5" class="shortcuts"><nobr><a href="#id3090788" class="shortcut">Top</a>  |  <a href="#id3086977" class="shortcut">Description</a>  |  <a href="#id3086890" class="shortcut">Object Hierarchy</a>  |  <a href="#id3086915" class="shortcut">Prerequisites</a>  |  <a href="#id3086937" class="shortcut">Known Implementations</a></nobr></td></tr></table><div class="refentry" lang="en"><a name="GSeekable"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><a name="id3090788"></a><span class="refentrytitle">GSeekable</span></h2><p>GSeekable — Stream seeking interface</p></td><td valign="top" align="right"></td></tr></table></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">#include <gio/gio.h> <a class="link" href="GSeekable.html#GSeekable-struct">GSeekable</a>; <a class="link" href="GSeekable.html#GSeekableIface">GSeekableIface</a>;<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#goffset">goffset</a> <a class="link" href="GSeekable.html#g-seekable-tell">g_seekable_tell</a> (<a class="link" href="GSeekable.html" title="GSeekable">GSeekable</a> *seekable);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="GSeekable.html#g-seekable-can-seek">g_seekable_can_seek</a> (<a class="link" href="GSeekable.html" title="GSeekable">GSeekable</a> *seekable);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="GSeekable.html#g-seekable-seek">g_seekable_seek</a> (<a class="link" href="GSeekable.html" title="GSeekable">GSeekable</a> *seekable, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#goffset">goffset</a> offset, <ahref="/usr/share/gtk-doc/html/glib/glib-IO-Channels.html#GSeekType">GSeekType</a> type, <a class="link" href="GCancellable.html" title="GCancellable">GCancellable</a> *cancellable, <ahref="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError">GError</a> **error);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="GSeekable.html#g-seekable-can-truncate">g_seekable_can_truncate</a> (<a class="link" href="GSeekable.html" title="GSeekable">GSeekable</a> *seekable);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="GSeekable.html#g-seekable-truncate">g_seekable_truncate</a> (<a class="link" href="GSeekable.html" title="GSeekable">GSeekable</a> *seekable, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#goffset">goffset</a> offset, <a class="link" href="GCancellable.html" title="GCancellable">GCancellable</a> *cancellable, <ahref="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError">GError</a> **error);</pre></div><div class="refsect1" lang="en"><a name="id3086890"></a><h2>Object Hierarchy</h2><pre class="synopsis"> GInterface +----GSeekable</pre></div><div class="refsect1" lang="en"><a name="id3086915"></a><h2>Prerequisites</h2><p>GSeekable requires <ahref="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>.</p></div><div class="refsect1" lang="en"><a name="id3086937"></a><h2>Known Implementations</h2><p>GSeekable is implemented by <a class="link" href="GFileOutputStream.html" title="GFileOutputStream">GFileOutputStream</a>, <a class="link" href="GMemoryInputStream.html" title="GMemoryInputStream">GMemoryInputStream</a>, <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream">GMemoryOutputStream</a> and <a class="link" href="GFileInputStream.html" title="GFileInputStream">GFileInputStream</a>.</p></div><div class="refsect1" lang="en"><a name="id3086977"></a><h2>Description</h2><p><a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> is implemented by streams (implementations of <a class="link" href="GInputStream.html" title="GInputStream"><span class="type">GInputStream</span></a> or <a class="link" href="GOutputStream.html" title="GOutputStream"><span class="type">GOutputStream</span></a>) that support seeking.</p><p></p></div><div class="refsect1" lang="en"><a name="id3087018"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3087029"></a><h3><a name="GSeekable-struct"></a>GSeekable</h3><a class="indexterm" name="id3087042"></a><pre class="programlisting">typedef struct _GSeekable GSeekable;</pre><p>Seek object for streaming operations.</p><p></p></div><hr><div class="refsect2" lang="en"><a name="id3087060"></a><h3><a name="GSeekableIface"></a>GSeekableIface</h3><a class="indexterm" name="id3087073"></a><pre class="programlisting">typedef struct { GTypeInterface g_iface; /* Virtual Table */ goffset (* tell) (GSeekable *seekable); gboolean (* can_seek) (GSeekable *seekable); gboolean (* seek) (GSeekable *seekable, goffset offset, GSeekType type, GCancellable *cancellable, GError **error); gboolean (* can_truncate) (GSeekable *seekable); gboolean (* truncate_fn) (GSeekable *seekable, goffset offset, GCancellable *cancellable, GError **error); /* TODO: Async seek/truncate */} GSeekableIface;</pre><p>Provides an interface for implementing seekable functionality on I/O Streams.</p><p></p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><ahref="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GTypeInterface">GTypeInterface</a> <em class="structfield"><code>g_iface</code></em>;</span></p></td><td> The parent interface.</td></tr><tr><td><p><span class="term"><em class="structfield"><code>tell</code></em> ()</span></p></td><td> Tells the current location within a stream.</td></tr><tr><td><p><span class="term"><em class="structfield"><code>can_seek</code></em> ()</span></p></td><td> Checks if seeking is supported by the stream.</td></tr><tr><td><p><span class="term"><em class="structfield"><code>seek</code></em> ()</span></p></td><td> Seeks to a location within a stream.</td></tr><tr><td><p><span class="term"><em class="structfield"><code>can_truncate</code></em> ()</span></p></td><td> Chekcs if truncation is suppored by the stream.</td></tr><tr><td><p><span class="term"><em class="structfield"><code>truncate_fn</code></em> ()</span></p></td><td> Truncates a stream.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3180162"></a><h3><a name="g-seekable-tell"></a>g_seekable_tell ()</h3><a class="indexterm" name="id3180175"></a><pre class="programlisting"><ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#goffset">goffset</a> g_seekable_tell (<a class="link" href="GSeekable.html" title="GSeekable">GSeekable</a> *seekable);</pre><p>Tells the current position within the stream.</p><p></p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>seekable</code></em> :</span></p></td><td> a <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a>.</td></tr><tr>⌨️ 快捷键说明
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