klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
196e706fe41f737f31d8617ead8fe566aa616329
hustoj/web/cppreference-zh/chmhelp/c-string-wide-wmemcpy.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

206 lines
14 KiB
HTML
Raw Blame History

<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>wmemcpy, wmemcpy_s</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_string_wide_wmemcpy skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading">wmemcpy, wmemcpy_s</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-string.html">string</a>&lrm; | <a href="c-string-wide.html">wide</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody>
<tr class="t-dsc-header">
<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;wchar.h&gt;</code></div>
</td>
<td></td>
<td></td>
</tr>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-c95 t-until-c99">
<td>
<div><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span><span class="sy2">*</span> wmemcpy<span class="br0">(</span> <span class="kw4">wchar_t</span><span class="sy2">*</span> dest, <span class="kw4">const</span> <span class="kw4">wchar_t</span><span class="sy2">*</span> src, <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>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-c95">(C95 &#36215;)</span><br />
<span class="t-mark-rev t-until-c99">(C99 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-c99">
<td>
<div><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span> <span class="sy2">*</span>wmemcpy<span class="br0">(</span><span class="kw4">wchar_t</span> <span class="sy2">*</span><span class="kw4">restrict</span> dest, <span class="kw4">const</span> <span class="kw4">wchar_t</span> <span class="sy2">*</span><span class="kw4">restrict</span> src,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<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>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
</tr>
</tbody>
<tbody>
<tr class="t-dcl t-since-c11">
<td>
<div><span class="mw-geshi c source-c">errno_t wmemcpy_s<span class="br0">(</span> <span class="kw4">wchar_t</span> <span class="sy2">*</span><span class="kw4">restrict</span> dest, rsize_t destsz,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <span class="kw4">wchar_t</span> <span class="sy2">*</span><span class="kw4">restrict</span> src, rsize_t count <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(2)</td>
<td><span class="t-mark-rev t-since-c11">(C11 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<div class="t-li1"><span class="t-li">1)</span> &#20174; <code>src</code> &#25152;&#25351;&#21521;&#30340;&#23485;&#23383;&#31526;&#25968;&#32452;&#20934;&#30830;&#22797;&#21046; <code>count</code> &#20010;&#30456;&#32487;&#30340;&#23485;&#23383;&#31526;&#21040; <code>dest</code> &#25152;&#25351;&#21521;&#30340;&#23485;&#23383;&#31526;&#25968;&#32452;&#12290;&#33509;&#23545;&#35937;&#37325;&#21472;&#65292;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;&#33509; <code>count</code> &#20026;&#38646;&#65292;&#21017;&#20989;&#25968;&#19981;&#20570;&#20219;&#20309;&#20107;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#38500;&#20102;&#22312;&#36816;&#34892;&#26102;&#26816;&#27979;&#19979;&#21015;&#38169;&#35823;&#65292;&#24182;&#35843;&#29992;&#24403;&#21069;&#23433;&#35013;&#30340;<a href="c-error-set_constraint_handler_s.html">&#21046;&#32422;&#22788;&#29702;</a>&#20989;&#25968;&#65306;
<dl>
<dd>
<ul>
<li><code>src</code> &#25110; <code>dest</code> &#26159;&#31354;&#25351;&#38024;</li>
<li><code>destsz</code> &#25110; <code>count</code> &#22823;&#20110; <span class="t-c"><span class="mw-geshi c source-c">RSIZE_MAX<span class="sy2">/</span><span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">wchar_t</span><span class="br0">)</span></span></span></li>
<li><code>count</code> &#22823;&#20110; <code>destsz</code> &#65288;&#20250;&#21457;&#29983;&#28322;&#20986;&#65289;</li>
<li>&#28304;&#21644;&#30446;&#26631;&#25968;&#32452;&#38388;&#20250;&#21457;&#29983;&#37325;&#21472;</li>
</ul>
</dd>
<dd></dd>
<dd>&#21516;&#25152;&#26377;&#36793;&#30028;&#26816;&#26597;&#20989;&#25968;&#65292; <code>wmemcpy_s</code> &#20165;&#33509;&#23454;&#29616;&#23450;&#20041;&#20102; <span class="t-c"><span class="mw-geshi c source-c">__STDC_LIB_EXT1__</span></span> &#65292;&#19988;&#29992;&#25143;&#22312;&#21253;&#21547; <code>wchar.h</code> &#21069;&#23450;&#20041; <span class="t-c"><span class="mw-geshi c source-c">__STDC_WANT_LIB_EXT1__</span></span> &#20026;&#25972;&#25968;&#24120;&#37327; <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">1</span></span></span> &#25165;&#20445;&#35777;&#21487;&#29992;&#12290;</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>dest</td>
<td>-</td>
<td>&#25351;&#21521;&#22797;&#21046;&#30446;&#26631;&#23485;&#23383;&#31526;&#25968;&#32452;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>src</td>
<td>-</td>
<td>&#25351;&#21521;&#22797;&#21046;&#26469;&#28304;&#23485;&#23383;&#31526;&#25968;&#32452;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>count</td>
<td>-</td>
<td>&#35201;&#22797;&#21046;&#30340;&#23485;&#23383;&#31526;&#25968;</td>
</tr>
<tr class="t-par">
<td>destsz</td>
<td>-</td>
<td>&#35201;&#20889;&#20837;&#30340;&#26368;&#22823;&#23485;&#23383;&#31526;&#25968;&#65288;&#30446;&#26631;&#32531;&#20914;&#21306;&#30340;&#22823;&#23567;&#65289;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#36820;&#22238; <code>dest</code> &#30340;&#21103;&#26412;</div>
<div class="t-li1"><span class="t-li">2)</span> &#25104;&#21151;&#26102;&#36820;&#22238;&#38646;&#65292;&#38169;&#35823;&#26102;&#36820;&#22238;&#38750;&#38646;&#12290;&#22312;&#38169;&#35823;&#26102;&#65292;&#20134;&#20197;&#31354;&#23485;&#23383;&#31526; <span class="t-c"><span class="mw-geshi c source-c">L<span class="st0">&#39;<span class="es5">\0</span>&#39;</span></span></span> &#22635;&#20805;&#25972;&#20010; <code>dst</code> &#65292;&#30452;&#21040;&#32780;&#19981;&#21253;&#21547; <span class="t-c"><span class="mw-geshi c source-c">dst<span class="sy2">+</span>dstsz</span></span> &#65288;&#38500;&#38750; <code>dest</code> &#20026;&#31354;&#25110; <code>destsz</code> &#22823;&#20110; <span class="t-c"><span class="mw-geshi c source-c">RSIZE_MAX<span class="sy2">/</span><span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">wchar_t</span><span class="br0">)</span></span></span> &#65289;</div>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p>&#27492;&#20989;&#25968;&#23545;&#23383;&#33410;&#23383;&#31526;&#20018;&#30340;&#31867;&#20284;&#29256;&#26412;&#26159; <span class="t-lc"><a href="c-string-byte-strncpy.html">strncpy</a></span> &#65292;&#32780;&#38750; <span class="t-lc"><a href="c-string-byte-strcpy.html">strcpy</a></span>&#12290;</p>
<p>&#27492;&#20989;&#25968;&#19981;&#32771;&#34385;&#26412;&#22320;&#29615;&#22659;&#65292;&#32780;&#19988;&#19981;&#20851;&#24515;&#20854;&#25152;&#22797;&#21046;&#30340; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span></span></span> &#23545;&#35937;&#30340;&#20540;&#65306;&#20134;&#22797;&#21046;&#31354;&#23383;&#31526;&#36824;&#26377;&#38750;&#27861;&#23383;&#31526;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="c source-c">
<pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;wchar.h&gt;</span>
<span class="co2">#include &lt;locale.h&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">wchar_t</span> from1<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> L<span class="st0">&quot;&#2344;&#2350;&#2360;&#2381;&#2340;&#2375;&quot;</span><span class="sy4">;</span>
<a href="c-types-size_t.html"><span class="kw100">size_t</span></a> sz1 <span class="sy1">=</span> <span class="kw4">sizeof</span> from1 <span class="sy2">/</span> <span class="kw4">sizeof</span> <span class="sy2">*</span>from1<span class="sy4">;</span>
<span class="kw4">wchar_t</span> from2<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> L<span class="st0">&quot;&#1330;&#1377;&#1408;&#1415;&quot;</span><span class="sy4">;</span>
<a href="c-types-size_t.html"><span class="kw100">size_t</span></a> sz2 <span class="sy1">=</span> <span class="kw4">sizeof</span> from2 <span class="sy2">/</span> <span class="kw4">sizeof</span> <span class="sy2">*</span>from2<span class="sy4">;</span>
<span class="kw4">wchar_t</span> to<span class="br0">[</span>sz1 <span class="sy2">+</span> sz2<span class="br0">]</span><span class="sy4">;</span>
wmemcpy<span class="br0">(</span>to, from1, sz1<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#22797;&#21046; from1 &#65292;&#27839;&#30528;&#20854;&#31354;&#32456;&#27490;&#31526;</span>
wmemcpy<span class="br0">(</span>to <span class="sy2">+</span> sz1, from2, sz2<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#21518;&#38468; from2 &#65292;&#27839;&#30528;&#20854;&#31354;&#32456;&#27490;&#31526;</span>
<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">&quot;en_US.utf8&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;Wide array contains: &quot;</span><span class="br0">)</span><span class="sy4">;</span>
<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">&lt;</span> <span class="kw4">sizeof</span> to <span class="sy2">/</span> <span class="kw4">sizeof</span> <span class="sy2">*</span>to<span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span>
<span class="kw1">if</span><span class="br0">(</span>to<span class="br0">[</span>n<span class="br0">]</span><span class="br0">)</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;%lc&quot;</span>, to<span class="br0">[</span>n<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;<span class="es1">\\</span>0&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;<span class="es1">\n</span>&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">Wide array contains: &#2344;&#2350;&#2360;&#2381;&#2340;&#2375;\0&#1330;&#1377;&#1408;&#1415;\0</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-11">
<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.29.4.2.3 The wmemcpy function (p: 431)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>K.3.9.2.1.3 The wmemcpy_s function (p: 641)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.24.4.2.3 The wmemcpy function (p: 377)</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-string-wide-wmemmove.html"><span class="t-lines"><span>wmemmove</span><span>wmemmove_s</span></span></a></div>
<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>
</div>
</td>
<td>&#22312;&#20004;&#20010;&#21487;&#33021;&#37325;&#21472;&#30340;&#25968;&#32452;&#38388;&#22797;&#21046;&#19968;&#23450;&#25968;&#37327;&#30340;&#23485;&#23383;&#31526;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-string-byte-strncpy.html"><span class="t-lines"><span>strncpy</span><span>strncpy_s</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
</div>
</td>
<td>&#20174;&#19968;&#20010;&#23383;&#31526;&#20018;&#22797;&#21046;&#19968;&#23450;&#25968;&#37327;&#30340;&#23383;&#31526;&#21040;&#21478;&#19968;&#20010;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink