146 lines
7.8 KiB
HTML
146 lines
7.8 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>wmemset</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_wmemset 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">wmemset</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">
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<td>
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<div><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span> <span class="sy2">*</span>wmemset<span class="br0">(</span> <span class="kw4">wchar_t</span> <span class="sy2">*</span>dest, <span class="kw4">wchar_t</span> ch, <a href="c-types-size_t.html"><span class="kw100">size_t</span></a> count <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>复制宽字符 <code>ch</code> 到 <code>dest</code> 所指向的宽字符数组（或兼容类型的整数数组）的首 <code>count</code> 个宽字符。</p>
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<p>若出现溢出，则行为未定义。</p>
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<p>若 <code>count</code> 为零，则函数不做任何事。</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>dest</td>
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<td>-</td>
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<td>指向要填充的宽字符数组的指针</td>
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</tr>
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<tr class="t-par">
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<td>ch</td>
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<td>-</td>
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<td>填充的宽字符</td>
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</tr>
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<tr class="t-par">
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<td>count</td>
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<td>-</td>
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<td>要填充的宽字符数</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>返回 <code>dest</code> 的副本</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>此函数不受本地环境影响，且不注意其写入的 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span></span></span> 对象的值：亦写入空字符还有非法宽字符。</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">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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<span class="kw4">wchar_t</span> ar<span class="br0">[</span><span class="nu0">10</span><span class="br0">]</span> <span class="sy1">=</span> L<span class="st0">"1234567890"</span><span class="sy4">;</span> <span class="co1">// 数组中无尾随空字符</span>
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wmemset<span class="br0">(</span>ar, L<span class="st0">'<span class="es4">\U0001f34c</span>'</span>, <span class="nu0">5</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 以 🍌 替换 [12345]</span>
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wmemset<span class="br0">(</span>ar<span class="sy2">+</span><span class="nu0">5</span>, L<span class="st0">'蕉'</span>, <span class="nu0">5</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 以 蕉 替换 [67890]</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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<span class="kw1">for</span><span class="br0">(</span><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1"><</span> <span class="kw4">sizeof</span> ar<span class="sy2">/</span><span class="kw4">sizeof</span> <span class="sy2">*</span>ar<span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span>
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<a href="c-io-putwchar.html"><span class="kw842">putwchar</span></a><span class="br0">(</span>ar<span class="br0">[</span>n<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-putwchar.html"><span class="kw842">putwchar</span></a><span class="br0">(</span>L<span class="st0">'<span class="es1">\n</span>'</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>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">🍌🍌🍌🍌🍌蕉蕉蕉蕉蕉</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>7.29.4.6.2 The wmemset function (p: 439)</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>7.24.4.6.2 The wmemset function (p: 385)</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-memset.html"><span class="t-lines"><span>memset</span><span>memset_s</span></span></a></div>
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<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
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</div>
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</td>
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<td>以字符填充缓冲区<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-wmemcpy.html"><span class="t-lines"><span>wmemcpy</span><span>wmemcpy_s</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><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
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</div>
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</td>
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<td>在两个不重叠的数组间复制一定数量的宽字符<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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