163 lines
11 KiB
HTML
163 lines
11 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>wcscoll</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_string_wide_wcscoll skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">wcscoll</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="c.html">c</a>‎ | <a href="c-string.html">string</a>‎ | <a href="c-string-wide.html">wide</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dsc-header">
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<td>
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<div>定义于头文件 <code><wchar.h></code></div>
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</td>
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<td></td>
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<td></td>
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</tr>
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<tr class="t-dcl t-since-c95">
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<td>
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<div><span class="mw-geshi c source-c"><span class="kw4">int</span> wcscoll<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">wchar_t</span> <span class="sy2">*</span>lhs, <span class="kw4">const</span> <span class="kw4">wchar_t</span> <span class="sy2">*</span>rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-c95">(C95 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>按照 <span class="t-lc"><a href="c-locale-LC_categories.html">LC_COLLATE</a></span> 类别所定义的当前安装的本地环境，比较二个空终止宽字符串。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>lhs, rhs</td>
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<td>-</td>
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<td>指向要比较的空终止宽字符串的指针</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>若 <code>lhs</code> <i>小于</i>（前趋） <code>rhs</code> 则为负值。</p>
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<p>若 <code>lhs</code> <i>等于</i> <code>rhs</code> 则为 <span class="t-c"><span class="mw-geshi c source-c">​<span class="nu0">0</span>​</span></span> 。</p>
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<p>若 <code>lhs</code> <i>大于</i>（后随） <code>rhs</code> 则为负值。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>对照顺序为字典顺序：国家字母表（其<i>等价类</i>）中字母的位置拥有高于其大小写或变体的优先级。在等价类内，小写字符先于其大写等价物对照，而且本地环境限定的顺序可能应用到有发音符号的字符。一些本地环境中，字符组作为单个<i>对照单元</i>比较。例如， <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"ch"</span></span></span> 在捷克语中后随 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"h"</span></span></span> 而前趋 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"i"</span></span></span> ， <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"dzs"</span></span></span> 在匈牙利语中后随 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"dz"</span></span></span> 而前趋 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"g"</span></span></span> 。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="c source-c">
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<pre class="de1"><span class="co2">#include <stdio.h></span>
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<span class="co2">#include <wchar.h></span>
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<span class="co2">#include <locale.h></span>
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<span class="kw4">void</span> try_compare<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">wchar_t</span><span class="sy2">*</span> p1, <span class="kw4">const</span> <span class="kw4">wchar_t</span><span class="sy2">*</span> p2<span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">if</span><span class="br0">(</span>wcscoll<span class="br0">(</span>p1, p2<span class="br0">)</span> <span class="sy1"><</span> <span class="nu0">0</span><span class="br0">)</span>
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<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"%ls before %ls<span class="es1">\n</span>"</span>, p1, p2<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">else</span>
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<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"%ls before %ls<span class="es1">\n</span>"</span>, p2, p1<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="c-locale-setlocale.html"><span class="kw900">setlocale</span></a><span class="br0">(</span><a href="c-locale-LC_categories.html"><span class="kw903">LC_ALL</span></a>, <span class="st0">"en_US.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"In the American locale: "</span><span class="br0">)</span><span class="sy4">;</span>
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try_compare<span class="br0">(</span>L<span class="st0">"hrnec"</span>, L<span class="st0">"chrt"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-locale-setlocale.html"><span class="kw900">setlocale</span></a><span class="br0">(</span><a href="c-locale-LC_categories.html"><span class="kw904">LC_COLLATE</span></a>, <span class="st0">"cs_CZ.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"In the Czech locale: "</span><span class="br0">)</span><span class="sy4">;</span>
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try_compare<span class="br0">(</span>L<span class="st0">"hrnec"</span>, L<span class="st0">"chrt"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-locale-setlocale.html"><span class="kw900">setlocale</span></a><span class="br0">(</span><a href="c-locale-LC_categories.html"><span class="kw904">LC_COLLATE</span></a>, <span class="st0">"en_US.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"In the American locale: "</span><span class="br0">)</span><span class="sy4">;</span>
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try_compare<span class="br0">(</span>L<span class="st0">"år"</span>, L<span class="st0">"ängel"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-locale-setlocale.html"><span class="kw900">setlocale</span></a><span class="br0">(</span><a href="c-locale-LC_categories.html"><span class="kw904">LC_COLLATE</span></a>, <span class="st0">"sv_SE.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"In the Swedish locale: "</span><span class="br0">)</span><span class="sy4">;</span>
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try_compare<span class="br0">(</span>L<span class="st0">"år"</span>, L<span class="st0">"ängel"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>可能的输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">In the American locale: chrt before hrnec
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In the Czech locale: hrnec before chrt
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In the American locale: ängel before år
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In the Swedish locale: år before ängel</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
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<div class="t-ref-std-11">
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<ul>
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<li>C11 标准（ISO/IEC 9899:2011）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.29.4.4.2 The wcscoll function (p: 433-434)</li>
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</ul>
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</dd>
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</dl>
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<div class="t-ref-std-c99">
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<ul>
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<li>C99 标准（ISO/IEC 9899:1999）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.24.4.4.2 The wcscoll function (p: 379-380)</li>
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</ul>
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</dd>
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</dl>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-string-byte-strcoll.html"><span class="t-lines"><span>strcoll</span></span></a></div>
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</div>
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</td>
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<td>比较两个字符串，根据当前本地环境<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-string-wide-wcsxfrm.html"><span class="t-lines"><span>wcsxfrm</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div>
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</div>
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</td>
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<td>变换宽字符串，使得 <code>wcscmp</code> 会产生与 <code>wcscoll</code> 相同的结果<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-string-wide-wcscmp.html"><span class="t-lines"><span>wcscmp</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div>
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</div>
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</td>
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<td>比较两个宽字符串<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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</div>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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