142 lines
9.2 KiB
HTML
142 lines
9.2 KiB
HTML
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>wcsstr</h1>
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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-wide.html">wide</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-cwchar.html"><cwchar></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">wchar_t</span><span class="sy2">*</span> wcsstr<span class="br0">(</span> <span class="kw4">const</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 <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"> <span class="kw4">wchar_t</span><span class="sy2">*</span> wcsstr<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 <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>寻找 <code>dest</code> 所指的空终止宽字符串在 <code>src</code> 所指的空终止宽字符串中的首次出现。不比较空终止字符。</p>
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<p>若 <code>src</code> 或 <code>dest</code> 不是指向空终止字节字符串的指针,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>指向要检验的空终止字节字符串的指针</td>
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<td>src</td>
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<td>-</td>
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<td>指向要搜索的空终止宽字符串的指针</td>
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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>指向于 <code>dest</code> 中找到的子串首字符的指针,或若找不到该子串则为空指针。若 <code>src</code> 指向空字符串,则返回 <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="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <cwchar></span>
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<span class="co2">#include <clocale></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">wchar_t</span> <span class="kw4">const</span><span class="sy2">*</span> origin <span class="sy1">=</span> L<span class="st0">"アルファ, ベータ, ガンマ, アルファ, ベータ, ガンマ."</span><span class="sy4">;</span>
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<span class="kw4">wchar_t</span> <span class="kw4">const</span><span class="sy2">*</span> target <span class="sy1">=</span> L<span class="st0">"ベータ"</span><span class="sy4">;</span>
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<span class="kw4">wchar_t</span> <span class="kw4">const</span><span class="sy2">*</span> result <span class="sy1">=</span> origin<span class="sy4">;</span>
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<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">"en_US.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">wcout</span></span></a> <span class="sy1"><<</span> L<span class="st0">"Substring to find: <span class="es1">\"</span>"</span> <span class="sy1"><<</span> target <span class="sy1"><<</span> L<span class="st0">"<span class="es1">\"</span><span class="es1">\n</span>"</span>
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<span class="sy1"><<</span> L<span class="st0">"String to search: "</span> <span class="sy1"><<</span> origin <span class="sy1"><<</span> L<span class="st0">"<span class="es1">\n</span><span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> <span class="br0">(</span>result <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">wcsstr</span><span class="br0">(</span>result, target<span class="br0">)</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> <a href="cpp-types-NULL.html"><span class="kw103">NULL</span></a><span class="sy4">;</span> <span class="sy2">++</span>result<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">wcout</span></span></a> <span class="sy1"><<</span> L<span class="st0">"found: "</span> <span class="sy1"><<</span> result <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>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">Substring to find: "ベータ"
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String to search: アルファ, ベータ, ガンマ, アルファ, ベータ, ガンマ.
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found: ベータ, ガンマ, アルファ, ベータ, ガンマ.
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found: ベータ, ガンマ.</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-basic_string-find.html"><span class="t-lines"><span>find</span></span></a></div>
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</div>
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</td>
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<td>于字符串中寻找字符<br />
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<span class="t-mark">(<code>std::basic_string<CharT,Traits,Allocator></code> 的公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-byte-strstr.html"><span class="t-lines"><span>strstr</span></span></a></div>
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</div>
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<td>寻找字符子串的首次出现<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-wide-wcschr.html"><span class="t-lines"><span>wcschr</span></span></a></div>
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</div>
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</td>
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<td>寻找宽字符串中宽字符的首次出现<br />
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<span class="t-mark">(函数)</span></td>
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<tr class="t-dsc">
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<div><a href="cpp-string-wide-wcsrchr.html"><span class="t-lines"><span>wcsrchr</span></span></a></div>
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</div>
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</td>
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<td>在宽字符串中寻找宽字符的最后一次出现<br />
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<span class="t-mark">(函数)</span></td>
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