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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>Byte Arrays</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="GLib Reference Manual"><link rel="up" href="glib-data-types.html" title="GLib Data Types"><link rel="prev" href="glib-Pointer-Arrays.html" title="Pointer Arrays"><link rel="next" href="glib-Balanced-Binary-Trees.html" title="Balanced Binary Trees"><meta name="generator" content="GTK-Doc V1.9 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="chapter" href="glib.html" title="GLib Overview"><link rel="chapter" href="glib-fundamentals.html" title="GLib Fundamentals"><link rel="chapter" href="glib-core.html" title="GLib Core Application Support"><link rel="chapter" href="glib-utilities.html" title="GLib Utilities"><link rel="chapter" href="glib-data-types.html" title="GLib Data 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href="glib-Pointer-Arrays.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="glib-data-types.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">GLib Reference Manual</th><td><a accesskey="n" href="glib-Balanced-Binary-Trees.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="#id3325435" class="shortcut">Top</a>  |  <a href="#id3325804" class="shortcut">Description</a></nobr></td></tr></table><div class="refentry" lang="en"><a name="glib-Byte-Arrays"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><a name="id3325435"></a><span class="refentrytitle">Byte Arrays</span></h2><p>Byte Arrays — arrays of bytes, which grow automatically as elements are added</p></td><td valign="top" align="right"></td></tr></table></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">#include <glib.h> <a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>;<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-new">g_byte_array_new</a> (void);<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-sized-new">g_byte_array_sized_new</a> (<a class="link" href="glib-Basic-Types.html#guint">guint</a> reserved_size);<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-append">g_byte_array_append</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, const <a class="link" href="glib-Basic-Types.html#guint8">guint8</a> *data, <a class="link" href="glib-Basic-Types.html#guint">guint</a> len);<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-prepend">g_byte_array_prepend</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, const <a class="link" href="glib-Basic-Types.html#guint8">guint8</a> *data, <a class="link" href="glib-Basic-Types.html#guint">guint</a> len);<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-remove-index">g_byte_array_remove_index</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, <a class="link" href="glib-Basic-Types.html#guint">guint</a> index_);<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-remove-index-fast">g_byte_array_remove_index_fast</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, <a class="link" href="glib-Basic-Types.html#guint">guint</a> index_);<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-remove-range">g_byte_array_remove_range</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, <a class="link" href="glib-Basic-Types.html#guint">guint</a> index_, <a class="link" href="glib-Basic-Types.html#guint">guint</a> length);void <a class="link" href="glib-Byte-Arrays.html#g-byte-array-sort">g_byte_array_sort</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, <a class="link" href="glib-Doubly-Linked-Lists.html#GCompareFunc">GCompareFunc</a> compare_func);void <a class="link" href="glib-Byte-Arrays.html#g-byte-array-sort-with-data">g_byte_array_sort_with_data</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, <a class="link" href="glib-Doubly-Linked-Lists.html#GCompareDataFunc">GCompareDataFunc</a> compare_func, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-set-size">g_byte_array_set_size</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, <a class="link" href="glib-Basic-Types.html#guint">guint</a> length);<a class="link" href="glib-Basic-Types.html#guint8">guint8</a>* <a class="link" href="glib-Byte-Arrays.html#g-byte-array-free">g_byte_array_free</a> (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, <a class="link" href="glib-Basic-Types.html#gboolean">gboolean</a> free_segment);</pre></div><div class="refsect1" lang="en"><a name="id3325804"></a><h2>Description</h2><p><a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> is based on <a class="link" href="glib-Arrays.html#GArray"><span class="type">GArray</span></a>, to provide arrays of bytes which growautomatically as elements are added.</p><p>To create a new <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> use <a class="link" href="glib-Byte-Arrays.html#g-byte-array-new"><code class="function">g_byte_array_new()</code></a>.</p><p>To add elements to a <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>, use <a class="link" href="glib-Byte-Arrays.html#g-byte-array-append"><code class="function">g_byte_array_append()</code></a>, and<a class="link" href="glib-Byte-Arrays.html#g-byte-array-prepend"><code class="function">g_byte_array_prepend()</code></a>.</p><p>To set the size of a <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>, use <a class="link" href="glib-Byte-Arrays.html#g-byte-array-set-size"><code class="function">g_byte_array_set_size()</code></a>.</p><p>To free a <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>, use <a class="link" href="glib-Byte-Arrays.html#g-byte-array-free"><code class="function">g_byte_array_free()</code></a>.</p><div class="example"><a name="id3325935"></a><p class="title"><b>Example 22. Using a <span class="structname">GByteArray</span></b></p><div class="example-contents"><pre class="programlisting"> GByteArray *gbarray; gint i; gbarray = g_byte_array_new (); for (i = 0; i < 10000; i++) g_byte_array_append (gbarray, (guint8*) "abcd", 4); for (i = 0; i < 10000; i++) { g_assert (gbarray->data[4*i] == 'a'); g_assert (gbarray->data[4*i+1] == 'b'); g_assert (gbarray->data[4*i+2] == 'c'); g_assert (gbarray->data[4*i+3] == 'd'); } g_byte_array_free (gbarray, TRUE);</pre></div></div><br class="example-break"></div><div class="refsect1" lang="en"><a name="id3325970"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3325980"></a><h3><a name="GByteArray"></a>GByteArray</h3><a class="indexterm" name="id3325992"></a><pre class="programlisting">typedef struct { guint8 *data; guint len;} GByteArray;</pre><p>The <span class="structname">GByteArray</span> struct allows access to the public fields of a <span class="structname">GByteArray</span>.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><a class="link" href="glib-Basic-Types.html#guint8">guint8</a> *<em class="structfield"><code>data</code></em>;</span></p></td><td>a pointer to the element data. The data may be moved as elements areadded to the <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</td></tr><tr><td><p><span class="term"><a class="link" href="glib-Basic-Types.html#guint">guint</a> <em class="structfield"><code>len</code></em>;</span></p></td><td>the number of elements in the <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3326078"></a><h3><a name="g-byte-array-new"></a>g_byte_array_new ()</h3><a class="indexterm" name="id3326090"></a><pre class="programlisting"><a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* g_byte_array_new (void);</pre><p>Creates a new <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td>the new <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3326143"></a><h3><a name="g-byte-array-sized-new"></a>g_byte_array_sized_new ()</h3><a class="indexterm" name="id3326156"></a><pre class="programlisting"><a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* g_byte_array_sized_new (<a class="link" href="glib-Basic-Types.html#guint">guint</a> reserved_size);</pre><p>Creates a new <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> with <em class="parameter"><code>reserved_size</code></em> bytes preallocated. Thisavoids frequent reallocation, if you are going to add many bytes tothe array. Note however that the size of the array is still 0.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>reserved_size</code></em> :</span></p></td><td>number of bytes preallocated.</td></tr><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td>the new <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3326239"></a><h3><a name="g-byte-array-append"></a>g_byte_array_append ()</h3><a class="indexterm" name="id3326252"></a><pre class="programlisting"><a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* g_byte_array_append (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, const <a class="link" href="glib-Basic-Types.html#guint8">guint8</a> *data, <a class="link" href="glib-Basic-Types.html#guint">guint</a> len);</pre><p>Adds the given bytes to the end of the <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.The array will grow in size automatically if necessary.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>array</code></em> :</span></p></td><td>a <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</td></tr><tr><td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td><td>the byte data to be added.</td></tr><tr><td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td><td>the number of bytes to add.</td></tr><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td>the <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3326377"></a><h3><a name="g-byte-array-prepend"></a>g_byte_array_prepend ()</h3><a class="indexterm" name="id3326390"></a><pre class="programlisting"><a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a>* g_byte_array_prepend (<a class="link" href="glib-Byte-Arrays.html#GByteArray">GByteArray</a> *array, const <a class="link" href="glib-Basic-Types.html#guint8">guint8</a> *data, <a class="link" href="glib-Basic-Types.html#guint">guint</a> len);</pre><p>Adds the given data to the start of the <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.The array will grow in size automatically if necessary.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>array</code></em> :</span></p></td><td>a <a class="link" href="glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</td></tr><tr><td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td><td>the byte data to be added.</td>⌨️ 快捷键说明
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