⚝
One Hat Cyber Team
⚝
Your IP:
216.73.216.10
Server IP:
157.245.101.34
Server:
Linux skvinfotech-website 5.4.0-131-generic #147-Ubuntu SMP Fri Oct 14 17:07:22 UTC 2022 x86_64
Server Software:
Apache/2.4.41 (Ubuntu)
PHP Version:
7.4.33
Buat File
|
Buat Folder
Eksekusi
Dir :
~
/
proc
/
self
/
root
/
usr
/
share
/
gtk-doc
/
html
/
gio
/
View File Name :
GSeekable.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>GSeekable: 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="streaming.html" title="Streaming I/O"> <link rel="next" href="GInputStream.html" title="GInputStream"> <meta name="generator" content="GTK-Doc V1.32 (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="#GSeekable.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> <a href="#GSeekable.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_prerequisites"> <span class="dim">|</span> <a href="#GSeekable.prerequisites" class="shortcut">Prerequisites</a></span><span id="nav_implementations"> <span class="dim">|</span> <a href="#GSeekable.implementations" class="shortcut">Known Implementations</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="streaming.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="GInputStream.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="GSeekable"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="GSeekable.top_of_page"></a>GSeekable</span></h2> <p>GSeekable — Stream seeking interface</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="GSeekable.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="function_type"> <span class="returnvalue">goffset</span> </td> <td class="function_name"> <a class="link" href="GSeekable.html#g-seekable-tell" title="g_seekable_tell ()">g_seekable_tell</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">gboolean</span> </td> <td class="function_name"> <a class="link" href="GSeekable.html#g-seekable-can-seek" title="g_seekable_can_seek ()">g_seekable_can_seek</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">gboolean</span> </td> <td class="function_name"> <a class="link" href="GSeekable.html#g-seekable-seek" title="g_seekable_seek ()">g_seekable_seek</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">gboolean</span> </td> <td class="function_name"> <a class="link" href="GSeekable.html#g-seekable-can-truncate" title="g_seekable_can_truncate ()">g_seekable_can_truncate</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">gboolean</span> </td> <td class="function_name"> <a class="link" href="GSeekable.html#g-seekable-truncate" title="g_seekable_truncate ()">g_seekable_truncate</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="GSeekable.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody> <tr> <td class="datatype_keyword"> </td> <td class="function_name"><a class="link" href="GSeekable.html#GSeekable-struct" title="GSeekable">GSeekable</a></td> </tr> <tr> <td class="datatype_keyword">struct</td> <td class="function_name"><a class="link" href="GSeekable.html#GSeekableIface" title="struct GSeekableIface">GSeekableIface</a></td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="GSeekable.object-hierarchy"></a><h2>Object Hierarchy</h2> <pre class="screen"> GInterface <span class="lineart">╰──</span> GSeekable </pre> </div> <div class="refsect1"> <a name="GSeekable.prerequisites"></a><h2>Prerequisites</h2> <p> GSeekable requires GObject.</p> </div> <div class="refsect1"> <a name="GSeekable.implementations"></a><h2>Known Implementations</h2> <p> GSeekable is implemented by <a class="link" href="GBufferedInputStream.html" title="GBufferedInputStream">GBufferedInputStream</a>, <a class="link" href="GBufferedOutputStream.html" title="GBufferedOutputStream">GBufferedOutputStream</a>, <a class="link" href="GDataInputStream.html" title="GDataInputStream">GDataInputStream</a>, <a class="link" href="GDataOutputStream.html" title="GDataOutputStream">GDataOutputStream</a>, <a class="link" href="GFileIOStream.html" title="GFileIOStream">GFileIOStream</a>, <a class="link" href="GFileInputStream.html" title="GFileInputStream">GFileInputStream</a>, <a class="link" href="GFileOutputStream.html" title="GFileOutputStream">GFileOutputStream</a>, <a class="link" href="GMemoryInputStream.html" title="GMemoryInputStream">GMemoryInputStream</a> and <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream">GMemoryOutputStream</a>.</p> </div> <div class="refsect1"> <a name="GSeekable.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gio/gio.h> </pre> </div> <div class="refsect1"> <a name="GSeekable.description"></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>Seekable streams largely fall into two categories: resizable and fixed-size.</p> <p><a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> on fixed-sized streams is approximately the same as POSIX <code class="function">lseek()</code> on a block device (for example: attempting to seek past the end of the device is an error). Fixed streams typically cannot be truncated.</p> <p><a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> on resizable streams is approximately the same as POSIX <code class="function">lseek()</code> on a normal file. Seeking past the end and writing data will usually cause the stream to resize by introducing zero bytes.</p> </div> <div class="refsect1"> <a name="GSeekable.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="g-seekable-tell"></a><h3>g_seekable_tell ()</h3> <pre class="programlisting"><span class="returnvalue">goffset</span> g_seekable_tell (<em class="parameter"><code><a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> *seekable</code></em>);</pre> <p>Tells the current position within the stream.</p> <div class="refsect3"> <a name="g-seekable-tell.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>seekable</p></td> <td class="parameter_description"><p>a <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-seekable-tell.returns"></a><h4>Returns</h4> <p> the offset from the beginning of the buffer.</p> </div> </div> <hr> <div class="refsect2"> <a name="g-seekable-can-seek"></a><h3>g_seekable_can_seek ()</h3> <pre class="programlisting"><span class="returnvalue">gboolean</span> g_seekable_can_seek (<em class="parameter"><code><a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> *seekable</code></em>);</pre> <p>Tests if the stream supports the <a class="link" href="GSeekable.html#GSeekableIface" title="struct GSeekableIface"><span class="type">GSeekableIface</span></a>.</p> <div class="refsect3"> <a name="g-seekable-can-seek.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>seekable</p></td> <td class="parameter_description"><p>a <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-seekable-can-seek.returns"></a><h4>Returns</h4> <p> <code class="literal">TRUE</code> if <em class="parameter"><code>seekable</code></em> can be seeked. <code class="literal">FALSE</code> otherwise.</p> </div> </div> <hr> <div class="refsect2"> <a name="g-seekable-seek"></a><h3>g_seekable_seek ()</h3> <pre class="programlisting"><span class="returnvalue">gboolean</span> g_seekable_seek (<em class="parameter"><code><a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> *seekable</code></em>, <em class="parameter"><code><span class="type">goffset</span> offset</code></em>, <em class="parameter"><code><span class="type">GSeekType</span> type</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><span class="type">GError</span> **error</code></em>);</pre> <p>Seeks in the stream by the given <em class="parameter"><code>offset</code></em> , modified by <em class="parameter"><code>type</code></em> .</p> <p>Attempting to seek past the end of the stream will have different results depending on if the stream is fixed-sized or resizable. If the stream is resizable then seeking past the end and then writing will result in zeros filling the empty space. Seeking past the end of a resizable stream and reading will result in EOF. Seeking past the end of a fixed-sized stream will fail.</p> <p>Any operation that would result in a negative offset will fail.</p> <p>If <em class="parameter"><code>cancellable</code></em> is not <code class="literal">NULL</code>, 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 returned.</p> <div class="refsect3"> <a name="g-seekable-seek.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>seekable</p></td> <td class="parameter_description"><p>a <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>offset</p></td> <td class="parameter_description"><p>a <span class="type">goffset</span>.</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <span class="type">GSeekType</span>.</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, <code class="literal">NULL</code> to ignore. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td> </tr> <tr> <td class="parameter_name"><p>error</p></td> <td class="parameter_description"><p>a <span class="type">GError</span> location to store the error occurring, or <code class="literal">NULL</code> to ignore.</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-seekable-seek.returns"></a><h4>Returns</h4> <p> <code class="literal">TRUE</code> if successful. If an error has occurred, this function will return <code class="literal">FALSE</code> and set <em class="parameter"><code>error</code></em> appropriately if present.</p> </div> </div> <hr> <div class="refsect2"> <a name="g-seekable-can-truncate"></a><h3>g_seekable_can_truncate ()</h3> <pre class="programlisting"><span class="returnvalue">gboolean</span> g_seekable_can_truncate (<em class="parameter"><code><a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> *seekable</code></em>);</pre> <p>Tests if the length of the stream can be adjusted with <a class="link" href="GSeekable.html#g-seekable-truncate" title="g_seekable_truncate ()"><code class="function">g_seekable_truncate()</code></a>.</p> <div class="refsect3"> <a name="g-seekable-can-truncate.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>seekable</p></td> <td class="parameter_description"><p>a <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-seekable-can-truncate.returns"></a><h4>Returns</h4> <p> <code class="literal">TRUE</code> if the stream can be truncated, <code class="literal">FALSE</code> otherwise.</p> </div> </div> <hr> <div class="refsect2"> <a name="g-seekable-truncate"></a><h3>g_seekable_truncate ()</h3> <pre class="programlisting"><span class="returnvalue">gboolean</span> g_seekable_truncate (<em class="parameter"><code><a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a> *seekable</code></em>, <em class="parameter"><code><span class="type">goffset</span> offset</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><span class="type">GError</span> **error</code></em>);</pre> <p>Sets the length of the stream to <em class="parameter"><code>offset</code></em> . If the stream was previously larger than <em class="parameter"><code>offset</code></em> , the extra data is discarded. If the stream was previouly shorter than <em class="parameter"><code>offset</code></em> , it is extended with NUL ('\0') bytes.</p> <p>If <em class="parameter"><code>cancellable</code></em> is not <code class="literal">NULL</code>, 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 returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.</p> <p><span class="annotation">[<acronym title="This is the invoker for a virtual method."><span class="acronym">virtual</span></acronym> truncate_fn]</span></p> <div class="refsect3"> <a name="g-seekable-truncate.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>seekable</p></td> <td class="parameter_description"><p>a <a class="link" href="GSeekable.html" title="GSeekable"><span class="type">GSeekable</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>offset</p></td> <td class="parameter_description"><p>new length for <em class="parameter"><code>seekable</code></em> , in bytes.</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, <code class="literal">NULL</code> to ignore. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td> </tr> <tr> <td class="parameter_name"><p>error</p></td> <td class="parameter_description"><p>a <span class="type">GError</span> location to store the error occurring, or <code class="literal">NULL</code> to ignore.</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-seekable-truncate.returns"></a><h4>Returns</h4> <p> <code class="literal">TRUE</code> if successful. If an error has occurred, this function will return <code class="literal">FALSE</code> and set <em class="parameter"><code>error</code></em> appropriately if present. </p> </div> </div> </div> <div class="refsect1"> <a name="GSeekable.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GSeekable-struct"></a><h3>GSeekable</h3> <pre class="programlisting">typedef struct _GSeekable GSeekable;</pre> <p>Seek object for streaming operations.</p> </div> <hr> <div class="refsect2"> <a name="GSeekableIface"></a><h3>struct GSeekableIface</h3> <pre class="programlisting">struct GSeekableIface { 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 */ }; </pre> <p>Provides an interface for implementing seekable functionality on I/O Streams.</p> <div class="refsect3"> <a name="GSeekableIface.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="300px" class="struct_members_name"> <col class="struct_members_description"> <col width="200px" class="struct_members_annotations"> </colgroup> <tbody> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GSeekableIface.tell"></a>tell</code></em> ()</p></td> <td class="struct_member_description"><p>Tells the current location within a stream.</p></td> <td class="struct_member_annotations"> </td> </tr> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GSeekableIface.can-seek"></a>can_seek</code></em> ()</p></td> <td class="struct_member_description"><p>Checks if seeking is supported by the stream.</p></td> <td class="struct_member_annotations"> </td> </tr> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GSeekableIface.seek"></a>seek</code></em> ()</p></td> <td class="struct_member_description"><p>Seeks to a location within a stream.</p></td> <td class="struct_member_annotations"> </td> </tr> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GSeekableIface.can-truncate"></a>can_truncate</code></em> ()</p></td> <td class="struct_member_description"><p>Checks if truncation is supported by the stream.</p></td> <td class="struct_member_annotations"> </td> </tr> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GSeekableIface.truncate-fn"></a>truncate_fn</code></em> ()</p></td> <td class="struct_member_description"><p>Truncates a stream.</p></td> <td class="struct_member_annotations"> </td> </tr> </tbody> </table></div> </div> </div> </div> <div class="refsect1"> <a name="GSeekable.see-also"></a><h2>See Also</h2> <p><a class="link" href="GInputStream.html" title="GInputStream"><span class="type">GInputStream</span></a>, <a class="link" href="GOutputStream.html" title="GOutputStream"><span class="type">GOutputStream</span></a></p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>