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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>wcsncmp</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-string.html">string</a>&lrm; | <a href="cpp-string-wide.html">wide</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-cwchar.html">&lt;cwchar&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> wcsncmp<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, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#27604;&#36739;&#20108;&#20010;&#31354;&#32456;&#27490;&#23485;&#23383;&#31526;&#20018;&#30340;&#33267;&#22810; <code>count</code> &#20010;&#23383;&#31526;&#12290;&#25353;&#23383;&#20856;&#24207;&#36827;&#34892;&#27604;&#36739;&#12290;</p>
<p>&#32467;&#26524;&#30340;&#31526;&#21495;&#26159;&#34987;&#27604;&#36739;&#30340;&#23383;&#31526;&#20018;&#20013;&#39318;&#23545;&#23485;&#23383;&#31526;&#30340;&#20540;&#38388;&#30340;&#24046;&#30340;&#31526;&#21495;&#12290;</p>
<p>&#33509; <code>lhs</code> &#25110; <code>rhs</code> &#19981;&#26159;&#25351;&#21521;&#31354;&#32456;&#27490;&#23383;&#31526;&#20018;&#30340;&#25351;&#38024;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>lhs, rhs</td>
<td>-</td>
<td>&#25351;&#21521;&#35201;&#27604;&#36739;&#30340;&#31354;&#32456;&#27490;&#23485;&#23383;&#31526;&#20018;&#30340;&#25351;&#38024;</td>
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<td>count</td>
<td>-</td>
<td>&#35201;&#27604;&#36739;&#30340;&#26368;&#22823;&#23383;&#31526;&#25968;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509;&#23383;&#20856;&#24207;&#20013; <code>lhs</code> &#20808;&#20986;&#29616;&#20110; <code>rhs</code> &#21017;&#20026;&#36127;&#20540;&#12290;</p>
<p>&#33509; <code>lhs</code> &#19982; <code>rhs</code> &#27604;&#36739;&#30456;&#31561;&#65292;&#25110;&#33509; count &#20026;&#38646;&#65292;&#21017;&#20026;&#38646;&#12290;</p>
<p>&#33509;&#23383;&#20856;&#24207;&#20013; <code>lhs</code> &#21518;&#20986;&#29616;&#20110; <code>rhs</code> &#21017;&#20026;&#36127;&#20540;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;cwchar&gt;</span>
<span class="co2">#include &lt;clocale&gt;</span>
<span class="co2">#include &lt;locale&gt;</span>
<span class="kw4">void</span> demo<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="kw4">int</span> sz<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">int</span> rc <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">wcsncmp</span><span class="br0">(</span>lhs, rhs, sz<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>rc <span class="sy1">==</span> <span class="nu0">0</span><span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">wcout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;First &quot;</span> <span class="sy1">&lt;&lt;</span> sz <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; characters of [&quot;</span>
<span class="sy1">&lt;&lt;</span> lhs <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;] equal [&quot;</span> <span class="sy1">&lt;&lt;</span> rhs <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;]<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="kw1">else</span> <span class="kw1">if</span><span class="br0">(</span>rc <span class="sy1">&lt;</span> <span class="nu0">0</span><span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">wcout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;First &quot;</span> <span class="sy1">&lt;&lt;</span> sz <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; characters of [&quot;</span>
<span class="sy1">&lt;&lt;</span> lhs <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;] precede [&quot;</span> <span class="sy1">&lt;&lt;</span> rhs <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;]<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="kw1">else</span> <span class="kw1">if</span><span class="br0">(</span>rc <span class="sy1">&gt;</span> <span class="nu0">0</span><span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">wcout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;First &quot;</span> <span class="sy1">&lt;&lt;</span> sz <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; characters of [&quot;</span>
<span class="sy1">&lt;&lt;</span> lhs <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;] follow [&quot;</span> <span class="sy1">&lt;&lt;</span> rhs <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;]<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">const</span> <span class="kw4">wchar_t</span> str1<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> L<span class="st0">&quot;&#50504;&#45397;&#54616;&#49464;&#50836;&quot;</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">wchar_t</span> str2<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> L<span class="st0">&quot;&#50504;&#45397;&#55176; &#44032;&#49901;&#49884;&#50724;&quot;</span><span class="sy4">;</span>
<a href="cpp-locale-setlocale.html"><span class="kw1989">std::<span class="me2">setlocale</span></span></a><span class="br0">(</span><a href="cpp-locale-LC_categories.html"><span class="kw1992">LC_ALL</span></a>, <span class="st0">&quot;en_US.utf8&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">wcout</span></span></a>.<span class="me1">imbue</span><span class="br0">(</span><a href="cpp-locale-locale.html"><span class="kw1893">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="st0">&quot;en_US.utf8&quot;</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
demo<span class="br0">(</span>str1, str2, <span class="nu0">5</span><span class="br0">)</span><span class="sy4">;</span>
demo<span class="br0">(</span>str2, str1, <span class="nu0">8</span><span class="br0">)</span><span class="sy4">;</span>
demo<span class="br0">(</span>str1, str2, <span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">First 5 characters of [&#50504;&#45397;&#54616;&#49464;&#50836;] precede [&#50504;&#45397;&#55176; &#44032;&#49901;&#49884;&#50724;]
First 8 characters of [&#50504;&#45397;&#55176; &#44032;&#49901;&#49884;&#50724;] follow [&#50504;&#45397;&#54616;&#49464;&#50836;]
First 2 characters of [&#50504;&#45397;&#54616;&#49464;&#50836;] equal [&#50504;&#45397;&#55176; &#44032;&#49901;&#49884;&#50724;]</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-string-byte-strncmp.html"><span class="t-lines"><span>strncmp</span></span></a></div>
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<td>&#27604;&#36739;&#20004;&#20010;&#23383;&#31526;&#20018;&#30340;&#19968;&#23450;&#37327;&#23383;&#31526;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-string-wide-wcscmp.html"><span class="t-lines"><span>wcscmp</span></span></a></div>
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<td>&#27604;&#36739;&#20004;&#20010;&#23485;&#23383;&#31526;&#20018;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-string-wide-wmemcmp.html"><span class="t-lines"><span>wmemcmp</span></span></a></div>
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<td>&#27604;&#36739;&#26469;&#33258;&#20004;&#20010;&#25968;&#32452;&#30340;&#19968;&#23450;&#37327;&#23485;&#23383;&#31526;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-string-wide-wcscoll.html"><span class="t-lines"><span>wcscoll</span></span></a></div>
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<td>&#25353;&#29031;&#24403;&#21069;&#26412;&#22320;&#29615;&#22659;&#27604;&#36739;&#20004;&#20010;&#23485;&#23383;&#31526;&#20018;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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