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<html xmlns:cf="http://docbook.sourceforge.net/xmlns/chunkfast/1.0"><head><meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"><title>Strings</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.0"><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-Hash-Tables.html" title="Hash Tables"><link rel="next" href="glib-String-Chunks.html" title="String Chunks"><meta name="generator" content="GTK-Doc V1.4 (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 Types"><link rel="chapter" href="tools.html" title="GLib Tools"><link rel="index" href="ix01.html" title="Index"><link rel="index" href="ix02.html" title="Index of deprecated symbols"><link rel="index" href="ix03.html" title="Index of new symbols in 2.2"><link rel="index" href="ix04.html" title="Index of new symbols in 2.4"><link rel="index" href="ix05.html" title="Index of new symbols in 2.6"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"><td><a accesskey="p" href="glib-Hash-Tables.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-String-Chunks.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr></table><div class="refentry" lang="en"><a name="glib-Strings"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><span class="refentrytitle">Strings</span></h2><p>Strings — text buffers which grow automatically as text is 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 href="glib-Strings.html#GString">GString</a>;<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-new">g_string_new</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *init);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-new-len">g_string_new_len</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *init, <a href="glib-Basic-Types.html#gssize">gssize</a> len);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-sized-new">g_string_sized_new</a> (<a href="glib-Basic-Types.html#gsize">gsize</a> dfl_size);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-assign">g_string_assign</a> (<a href="glib-Strings.html#GString">GString</a> *string, const <a href="glib-Basic-Types.html#gchar">gchar</a> *rval);#define <a href="glib-Strings.html#g-string-sprintf">g_string_sprintf</a>#define <a href="glib-Strings.html#g-string-sprintfa">g_string_sprintfa</a>void <a href="glib-Strings.html#g-string-printf">g_string_printf</a> (<a href="glib-Strings.html#GString">GString</a> *string, const <a href="glib-Basic-Types.html#gchar">gchar</a> *format, ...);void <a href="glib-Strings.html#g-string-append-printf">g_string_append_printf</a> (<a href="glib-Strings.html#GString">GString</a> *string, const <a href="glib-Basic-Types.html#gchar">gchar</a> *format, ...);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-append">g_string_append</a> (<a href="glib-Strings.html#GString">GString</a> *string, const <a href="glib-Basic-Types.html#gchar">gchar</a> *val);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-append-c">g_string_append_c</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gchar">gchar</a> c);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-append-unichar">g_string_append_unichar</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Unicode-Manipulation.html#gunichar">gunichar</a> wc);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-append-len">g_string_append_len</a> (<a href="glib-Strings.html#GString">GString</a> *string, const <a href="glib-Basic-Types.html#gchar">gchar</a> *val, <a href="glib-Basic-Types.html#gssize">gssize</a> len);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-prepend">g_string_prepend</a> (<a href="glib-Strings.html#GString">GString</a> *string, const <a href="glib-Basic-Types.html#gchar">gchar</a> *val);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-prepend-c">g_string_prepend_c</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gchar">gchar</a> c);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-prepend-unichar">g_string_prepend_unichar</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Unicode-Manipulation.html#gunichar">gunichar</a> wc);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-prepend-len">g_string_prepend_len</a> (<a href="glib-Strings.html#GString">GString</a> *string, const <a href="glib-Basic-Types.html#gchar">gchar</a> *val, <a href="glib-Basic-Types.html#gssize">gssize</a> len);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-insert">g_string_insert</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gssize">gssize</a> pos, const <a href="glib-Basic-Types.html#gchar">gchar</a> *val);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-insert-c">g_string_insert_c</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gssize">gssize</a> pos, <a href="glib-Basic-Types.html#gchar">gchar</a> c);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-insert-unichar">g_string_insert_unichar</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gssize">gssize</a> pos, <a href="glib-Unicode-Manipulation.html#gunichar">gunichar</a> wc);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-insert-len">g_string_insert_len</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gssize">gssize</a> pos, const <a href="glib-Basic-Types.html#gchar">gchar</a> *val, <a href="glib-Basic-Types.html#gssize">gssize</a> len);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-erase">g_string_erase</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gssize">gssize</a> pos, <a href="glib-Basic-Types.html#gssize">gssize</a> len);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-truncate">g_string_truncate</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gsize">gsize</a> len);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-set-size">g_string_set_size</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gsize">gsize</a> len);<a href="glib-Basic-Types.html#gchar">gchar</a>* <a href="glib-Strings.html#g-string-free">g_string_free</a> (<a href="glib-Strings.html#GString">GString</a> *string, <a href="glib-Basic-Types.html#gboolean">gboolean</a> free_segment);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-up">g_string_up</a> (<a href="glib-Strings.html#GString">GString</a> *string);<a href="glib-Strings.html#GString">GString</a>* <a href="glib-Strings.html#g-string-down">g_string_down</a> (<a href="glib-Strings.html#GString">GString</a> *string);<a href="glib-Basic-Types.html#guint">guint</a> <a href="glib-Strings.html#g-string-hash">g_string_hash</a> (const <a href="glib-Strings.html#GString">GString</a> *str);<a href="glib-Basic-Types.html#gboolean">gboolean</a> <a href="glib-Strings.html#g-string-equal">g_string_equal</a> (const <a href="glib-Strings.html#GString">GString</a> *v, const <a href="glib-Strings.html#GString">GString</a> *v2);</pre></div><div class="refsect1" lang="en"><a name="id3146649"></a><h2>Description</h2><p>A <a href="glib-Strings.html#GString"><span class="type">GString</span></a> is similar to a standard C string, except that it grows automaticallyas text is appended or inserted. Also, it stores the length of the string, socan be used for binary data with embedded nul bytes.</p></div><div class="refsect1" lang="en"><a name="id3146670"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3146676"></a><h3><a name="GString"></a>GString</h3><a class="indexterm" name="id3146686"></a><pre class="programlisting">typedef struct { gchar *str; gsize len; gsize allocated_len;} GString;</pre><p>The <a href="glib-Strings.html#GString"><span class="type">GString</span></a> struct contains the public fields of a <a href="glib-Strings.html#GString"><span class="type">GString</span></a>.The <em class="structfield"><code>str</code></em> field points to the character data.It may move as text is added.The <em class="structfield"><code>len</code></em> field contains the length of the string,not including the terminating nul character.</p><p>The <em class="structfield"><code>str</code></em> field is nul-terminated and so can be used as an ordinary Cstring. But it may be moved when text is appended or inserted into thestring.</p></div><hr><div class="refsect2" lang="en"><a name="id3146738"></a><h3><a name="g-string-new"></a>g_string_new ()</h3><a class="indexterm" name="id3146748"></a><pre class="programlisting"><a href="glib-Strings.html#GString">GString</a>* g_string_new (const <a href="glib-Basic-Types.html#gchar">gchar</a> *init);</pre><p>Creates a new <a href="glib-Strings.html#GString"><span class="type">GString</span></a>, initialized with the given string.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><em class="parameter"><code>init</code></em> :</span></td><td>the initial text to copy into the string.</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the new <a href="glib-Strings.html#GString"><span class="type">GString</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3146822"></a><h3><a name="g-string-new-len"></a>g_string_new_len ()</h3><a class="indexterm" name="id3146832"></a><pre class="programlisting"><a href="glib-Strings.html#GString">GString</a>* g_string_new_len (const <a href="glib-Basic-Types.html#gchar">gchar</a> *init, <a href="glib-Basic-Types.html#gssize">gssize</a> len);</pre><p>Creates a new <a href="glib-Strings.html#GString"><span class="type">GString</span></a> with <em class="parameter"><code>len</code></em> bytes of the <em class="parameter"><code>init</code></em> buffer. Because a length isprovided, <em class="parameter"><code>init</code></em> need not be nul-terminated, and can contain embedded nul bytes.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><em class="parameter"><code>init</code></em> :</span></td><td>initial contents of string.</td></tr><tr><td><span class="term"><em class="parameter"><code>len</code></em> :</span></td><td>length of <em class="parameter"><code>init</code></em> to use.</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>a new <a href="glib-Strings.html#GString"><span class="type">GString</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3146952"></a><h3><a name="g-string-sized-new"></a>g_string_sized_new ()</h3><a class="indexterm" name="id3146963"></a><pre class="programlisting"><a href="glib-Strings.html#GString">GString</a>* g_string_sized_new (<a href="glib-Basic-Types.html#gsize">gsize</a> dfl_size);</pre><p>Creates a new <a href="glib-Strings.html#GString"><span class="type">GString</span></a>, with enough space for <em class="parameter"><code>dfl_size</code></em> characters.This is useful if you are going to add a lot of text to the string anddon't want it to be reallocated too often.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><em class="parameter"><code>dfl_size</code></em> :</span></td><td>the default size of the space allocated to hold the string.</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the new <a href="glib-Strings.html#GString"><span class="type">GString</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3147044"></a><h3><a name="g-string-assign"></a>g_string_assign ()</h3><a class="indexterm" name="id3147055"></a><pre class="programlisting"><a href="glib-Strings.html#GString">GString</a>* g_string_assign (<a href="glib-Strings.html#GString">GString</a> *string, const <a href="glib-Basic-Types.html#gchar">gchar</a> *rval);</pre><p>Copies the characters from a string into a <a href="glib-Strings.html#GString"><span class="type">GString</span></a>, destroying any previouscontents. It is rather like the standard <code class="function"><code class="function">strcpy()</code></code> function, except thatyou do not have to worry about having enough space to copy the string.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><em class="parameter"><code>string</code></em> :</span></td><td>the destination <a href="glib-Strings.html#GString"><span class="type">GString</span></a>. Its current contents are destroyed.</td></tr><tr><td><span class="term"><em class="parameter"><code>rval</code></em> :</span></td><td></td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the destination <a href="glib-Strings.html#GString"><span class="type">GString</span></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3147174"></a><h3><a name="g-string-sprintf"></a>g_string_sprintf</h3><a class="indexterm" name="id3147185"></a><pre class="programlisting">#define g_string_sprintf</pre><div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Warning</h3><p><code class="literal">g_string_sprintf</code> is deprecated and should not be used in newly-written code. This function has been renamed to <a href="glib-Strings.html#g-string-printf"><code class="function">g_string_printf()</code></a>.</p></div><p>Writes a formatted string into a <a href="glib-Strings.html#GString"><span class="type">GString</span></a>.This is similar to the standard <code class="function"><code class="function">sprintf()</code></code> function,except that the <a href="glib-Strings.html#GString"><span class="type">GString</span></a> buffer automatically expands to contain the results.The previous contents of the <a href="glib-Strings.html#GString"><span class="type">GString</span></a> are destroyed. </p></div>⌨️ 快捷键说明
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