110 lines
6.3 KiB
HTML
110 lines
6.3 KiB
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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<title>std::strcpy</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_byte_strcpy skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>strcpy</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-string.html">string</a>‎ | <a href="cpp-string-byte.html">byte</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-cstring.html"><cstring></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span><span class="sy2">*</span> strcpy<span class="br0">(</span> <span class="kw4">char</span><span class="sy2">*</span> dest, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> src <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>复制 <code>src</code> 所指向的字符串，包含空终止符，到首元素为 <code>dest</code> 所指向的字符数组。</p>
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<p>若 <code>dest</code> 数组不够大则行为未定义。若字符串重叠则行为未定义。</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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<td>dest</td>
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<td>-</td>
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<td>指向要写入的字符数组的指针</td>
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</tr>
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<tr class="t-par">
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<td>src</td>
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<td>-</td>
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<td>指向复制来源的空终止字节字符串的指针</td>
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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><code>dest</code></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="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <cstring></span>
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<span class="co2">#include <memory></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> src <span class="sy1">=</span> <span class="st0">"Take the test."</span><span class="sy4">;</span>
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<span class="co1">// src[0] = 'M'; // 不能修改字符串字面量</span>
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<span class="kw4">auto</span> dst <span class="sy1">=</span> <a href="cpp-memory-unique_ptr-make_unique.html"><span class="kw735">std::<span class="me2">make_unique</span></span></a><span class="sy1"><</span><span class="kw4">char</span><span class="br0">[</span><span class="br0">]</span><span class="sy1">></span><span class="br0">(</span><a href="cpp-string-byte-strlen.html"><span class="kw1144">std::<span class="me2">strlen</span></span></a><span class="br0">(</span>src<span class="br0">)</span><span class="sy2">+</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 为空终止符 +1</span>
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std<span class="sy4">::</span><span class="me2">strcpy</span><span class="br0">(</span>dst.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span>, src<span class="br0">)</span><span class="sy4">;</span>
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dst<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span> <span class="sy1">=</span> <span class="st0">'M'</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> src <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span> <span class="sy1"><<</span> dst.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</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">Take the test.
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Make the test.</pre></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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<div class="t-dsc-member-div">
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<div><a href="cpp-string-byte-strncpy.html"><span class="t-lines"><span>strncpy</span></span></a></div>
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</div>
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</td>
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<td>复制来自一个字符串的一定量字符给另一个<br />
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<span class="t-mark">(函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-byte-memcpy.html"><span class="t-lines"><span>memcpy</span></span></a></div>
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</div>
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</td>
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<td>复制一个缓冲区到另一个<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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