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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>Strings</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-Hash-Tables.html" title="Hash Tables"><link rel="next" href="glib-String-Chunks.html" title="String Chunks"><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 Types"><link rel="chapter" 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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><tr><td colspan="5" class="shortcuts"><nobr><a href="#id3300362" class="shortcut">Top</a>  |  <a href="#id3301435" class="shortcut">Description</a></nobr></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><a name="id3300362"></a><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 class="link" href="glib-Strings.html#GString">GString</a>;<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-new">g_string_new</a> (const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *init);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-new-len">g_string_new_len</a> (const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *init, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> len);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-sized-new">g_string_sized_new</a> (<a class="link" href="glib-Basic-Types.html#gsize">gsize</a> dfl_size);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-assign">g_string_assign</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *rval);#define <a class="link" href="glib-Strings.html#g-string-sprintf">g_string_sprintf</a>#define <a class="link" href="glib-Strings.html#g-string-sprintfa">g_string_sprintfa</a>void <a class="link" href="glib-Strings.html#g-string-vprintf">g_string_vprintf</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *format, va_list args);void <a class="link" href="glib-Strings.html#g-string-append-vprintf">g_string_append_vprintf</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *format, va_list args);void <a class="link" href="glib-Strings.html#g-string-printf">g_string_printf</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *format, ...);void <a class="link" href="glib-Strings.html#g-string-append-printf">g_string_append_printf</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *format, ...);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-append">g_string_append</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *val);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-append-c">g_string_append_c</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> c);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-append-unichar">g_string_append_unichar</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Unicode-Manipulation.html#gunichar">gunichar</a> wc);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-append-len">g_string_append_len</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *val, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> len);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-append-uri-escaped">g_string_append_uri_escaped</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const char *unescaped, const char *reserved_chars_allowed, <a class="link" href="glib-Basic-Types.html#gboolean">gboolean</a> allow_utf8);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-prepend">g_string_prepend</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *val);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-prepend-c">g_string_prepend_c</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> c);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-prepend-unichar">g_string_prepend_unichar</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Unicode-Manipulation.html#gunichar">gunichar</a> wc);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-prepend-len">g_string_prepend_len</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *val, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> len);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-insert">g_string_insert</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> pos, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *val);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-insert-c">g_string_insert_c</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> pos, <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> c);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-insert-unichar">g_string_insert_unichar</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> pos, <a class="link" href="glib-Unicode-Manipulation.html#gunichar">gunichar</a> wc);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-insert-len">g_string_insert_len</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> pos, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *val, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> len);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-overwrite">g_string_overwrite</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gsize">gsize</a> pos, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *val);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-overwrite-len">g_string_overwrite_len</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gsize">gsize</a> pos, const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *val, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> len);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-erase">g_string_erase</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> pos, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> len);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-truncate">g_string_truncate</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gsize">gsize</a> len);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-set-size">g_string_set_size</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gsize">gsize</a> len);<a class="link" href="glib-Basic-Types.html#gchar">gchar</a>* <a class="link" href="glib-Strings.html#g-string-free">g_string_free</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string, <a class="link" href="glib-Basic-Types.html#gboolean">gboolean</a> free_segment);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-up">g_string_up</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string);<a class="link" href="glib-Strings.html#GString">GString</a>* <a class="link" href="glib-Strings.html#g-string-down">g_string_down</a> (<a class="link" href="glib-Strings.html#GString">GString</a> *string);<a class="link" href="glib-Basic-Types.html#guint">guint</a> <a class="link" href="glib-Strings.html#g-string-hash">g_string_hash</a> (const <a class="link" href="glib-Strings.html#GString">GString</a> *str);<a class="link" href="glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="glib-Strings.html#g-string-equal">g_string_equal</a> (const <a class="link" href="glib-Strings.html#GString">GString</a> *v, const <a class="link" href="glib-Strings.html#GString">GString</a> *v2);</pre></div><div class="refsect1" lang="en"><a name="id3301435"></a><h2>Description</h2><p>A <a class="link" href="glib-Strings.html#GString"><span class="type">GString</span></a> is similar to a standard C string, except that it grows automatically as text is appended or inserted. Also, it stores the length of the string, so can be used for binary data with embedded nul bytes.</p></div><div class="refsect1" lang="en"><a name="id3301461"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3301471"></a><h3><a name="GString"></a>GString</h3><a class="indexterm" name="id3301484"></a><pre class="programlisting">typedef struct { gchar *str; gsize len; gsize allocated_len;} GString;</pre><p>The <a class="link" href="glib-Strings.html#GString"><span class="type">GString</span></a> struct contains the public fields of a <a class="link" href="glib-Strings.html#GString"><span class="type">GString</span></a>.</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#gchar">gchar</a> *<em class="structfield"><code>str</code></em>;</span></p></td><td>points to the character data. It may move as text is added. The <em class="structfield"><code>str</code></em> field is nul-terminated and so can be used as an ordinary C string.</td></tr><tr><td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gsize">gsize</a> <em class="structfield"><code>len</code></em>;</span></p></td><td>contains the length of the string, not including the terminating nul byte.</td></tr><tr><td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gsize">gsize</a> <em class="structfield"><code>allocated_len</code></em>;</span></p></td><td>the number of bytes that can be stored in the string before it needs to be reallocated. May be larger than <em class="parameter"><code>len</code></em>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3301595"></a><h3><a name="g-string-new"></a>g_string_new ()</h3><a class="indexterm" name="id3301608"></a><pre class="programlisting"><a class="link" href="glib-Strings.html#GString">GString</a>* g_string_new (const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *init);</pre><p>Creates a new <a class="link" href="glib-Strings.html#GString"><span class="type">GString</span></a>, initialized with the given string.</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>init</code></em> :</span></p></td><td> the initial text to copy into the string</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-Strings.html#GString"><span class="type">GString</span></a></td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3301685"></a><h3><a name="g-string-new-len"></a>g_string_new_len ()</h3><a class="indexterm" name="id3301697"></a><pre class="programlisting"><a class="link" href="glib-Strings.html#GString">GString</a>* g_string_new_len (const <a class="link" href="glib-Basic-Types.html#gchar">gchar</a> *init, <a class="link" href="glib-Basic-Types.html#gssize">gssize</a> len);</pre><p>Creates a new <a class="link" 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 is provided, <em class="parameter"><code>init</code></em> need not be nul-terminated,and can contain embedded nul bytes.</p><p>Since this function does not stop at nul bytes, it is the caller'sresponsibility to ensure that <em class="parameter"><code>init</code></em> has at least <em class="parameter"><code>len</code></em> addressable bytes.</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>init</code></em> :</span></p></td><td> initial contents of the string</td></tr><tr><td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td><td> length of <em class="parameter"><code>init</code></em> to use</td></tr><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td> a new <a class="link" 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="id3301837"></a><h3>⌨️ 快捷键说明
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