229 lines
13 KiB
HTML
229 lines
13 KiB
HTML
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<title>std::wstring_convert</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_locale_wstring_convert 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>wstring_convert</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-locale.html">locale</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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<div>定义于头文件 <code><a href="cpp-header-locale.html"><locale></a></code></div>
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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Codecvt,<br /></span>
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<p> <span class="kw1">class</span> Elem <span class="sy1">=</span> <span class="kw4">wchar_t</span>,<br />
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<span class="kw1">class</span> Wide_alloc <span class="sy1">=</span> <a href="cpp-memory-allocator.html"><span class="kw700">std::<span class="me2">allocator</span></span></a><span class="sy1"><</span>Elem<span class="sy1">></span>,<br />
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<span class="kw1">class</span> Byte_alloc <span class="sy1">=</span> <a href="cpp-memory-allocator.html"><span class="kw700">std::<span class="me2">allocator</span></span></a><span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> <span class="sy1">></span><br /></p>
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<span class="kw1">class</span> wstring_convert<span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark">(C++17 中弃用)</span></td>
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<td></td>
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<p>类模板 <code>std::wstring_convert</code> 用单独的编码转换平面 <code>Codecvt</code> ，进行字节字符串 <span class="t-lc"><a href="cpp-string-basic_string.html">std::string</a></span> 和宽字符串 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1"><</span>Elem<span class="sy1">></span></span></span> 间的转换。 <code>std::wstring_convert</code> 假定拥有转换平面的所有权，而不能使用 locale 所管理的平面。适用于 <code>std::wstring_convert</code> 的标准平面对于 UTF-8/UCS2 和 UTF-8/UCS4 转换是 <span class="t-lc"><a href="cpp-locale-codecvt_utf8.html">std::codecvt_utf8</a></span> ，而对于 UTF-8/UTF-16 转换是 <span class="t-lc"><a href="cpp-locale-codecvt_utf8_utf16.html">std::codecvt_utf8_utf16</a></span> 。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<table class="t-dsc-begin">
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<td>成员类型</td>
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<td>定义</td>
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<tr class="t-dsc">
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<td><code>byte_string</code></td>
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<td><code>std::basic_string<char, char_traits<char>, Byte_alloc></code></td>
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<tr class="t-dsc">
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<td><code>wide_string</code></td>
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<td><code>std::basic_string<Elem, char_traits<Elem>, Wide_alloc></code></td>
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<tr class="t-dsc">
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<td><code>state_type</code></td>
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<td><code>Codecvt::state_type</code></td>
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<tr class="t-dsc">
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<td><code>int_type</code></td>
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<td><code>wide_string::traits_type::int_type</code></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-locale-wstring_convert-wstring_convert.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造新的 wstring_convert<br />
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<span class="t-mark">(公开成员函数)</span></td>
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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><span class="t-lines"><span>operator=</span></span></div>
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</div>
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</td>
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<td>复制赋值运算符被删除<br />
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<span class="t-mark">(公开成员函数)</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 t-dsc-member-nobold-div">
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<div><a href="cpp-locale-wstring_convert-~wstring_convert.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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</div>
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</td>
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<td>析构 wstring_convert 及其转换平面<br />
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<span class="t-mark">(公开成员函数)</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="cpp-locale-wstring_convert-from_bytes.html"><span class="t-lines"><span>from_bytes</span></span></a></div>
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</div>
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</td>
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<td>转换字节字符串为宽字符串<br />
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<span class="t-mark">(公开成员函数)</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="cpp-locale-wstring_convert-to_bytes.html"><span class="t-lines"><span>to_bytes</span></span></a></div>
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</div>
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</td>
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<td>转换宽字符串为字符串<br />
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<span class="t-mark">(公开成员函数)</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="cpp-locale-wstring_convert-converted.html"><span class="t-lines"><span>converted</span></span></a></div>
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</div>
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</td>
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<td>返回成功转换的字符数<br />
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<span class="t-mark">(公开成员函数)</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="cpp-locale-wstring_convert-state.html"><span class="t-lines"><span>state</span></span></a></div>
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</div>
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</td>
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<td>返回当前转换状态<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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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="wikitable" style="font-size:85%; text-align:center;">
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<th>字符转换</th>
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<th>本地环境定义多字节<br />
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(UTF-8, GB18030)</th>
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<th>UTF-8<br /></th>
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<th>UTF-16<br /></th>
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</tr>
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<tr>
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<th>UTF-16</th>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes"><a href="cpp-string-multibyte-mbrtoc16.html"><tt>mbrtoc16</tt></a> / <a href="cpp-string-multibyte-c16rtomb.html"><tt>c16rtomb</tt></a><span class="t-mark">(有 C11 的 DR488)</span></td>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes"><a href="cpp-locale-codecvt.html"><tt>codecvt</tt></a><char16_t, char, mbstate_t><br />
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<a href="cpp-locale-codecvt_utf8_utf16.html"><tt>codecvt_utf8_utf16</tt></a><char16_t><br />
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<a href="cpp-locale-codecvt_utf8_utf16.html"><tt>codecvt_utf8_utf16</tt></a><char32_t><br />
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<a href="cpp-locale-codecvt_utf8_utf16.html"><tt>codecvt_utf8_utf16</tt></a><wchar_t></td>
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<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"><small>N/A</small></td>
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<th>UCS2</th>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes"><a href="cpp-string-multibyte-c16rtomb.html"><tt>c16rtomb</tt></a><span class="t-mark">(无 C11 的 DR488)</span></td>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes"><a href="cpp-locale-codecvt_utf8.html"><tt>codecvt_utf8</tt></a><char16_t><br />
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<p><a href="cpp-locale-codecvt_utf8.html"><tt>codecvt_utf8</tt></a><wchar_t><span class="t-mark">(Windows)</span></p>
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</td>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes"><a href="cpp-locale-codecvt_utf16.html"><tt>codecvt_utf16</tt></a><char16_t><br />
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<p><a href="cpp-locale-codecvt_utf16.html"><tt>codecvt_utf16</tt></a><wchar_t><span class="t-mark">(Windows)</span></p>
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</td>
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</tr>
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<tr>
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<th>UTF-32</th>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes">
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<p><a href="cpp-string-multibyte-mbrtoc32.html"><tt>mbrtoc32</tt></a> / <a href="cpp-string-multibyte-c32rtomb.html"><tt>c32rtomb</tt></a></p>
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</td>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes">
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<p><a href="cpp-locale-codecvt.html"><tt>codecvt</tt></a><char32_t, char, mbstate_t><br />
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<a href="cpp-locale-codecvt_utf8.html"><tt>codecvt_utf8</tt></a><char32_t><br />
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<a href="cpp-locale-codecvt_utf8.html"><tt>codecvt_utf8</tt></a><wchar_t><span class="t-mark">(非 Windows)</span></p>
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</td>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes">
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<p><a href="cpp-locale-codecvt_utf16.html"><tt>codecvt_utf16</tt></a><char32_t><br />
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<a href="cpp-locale-codecvt_utf16.html"><tt>codecvt_utf16</tt></a><wchar_t><span class="t-mark">(非 Windows)</span></p>
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</td>
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</tr>
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<tr>
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<th>系统宽<br />
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UTF-32<span class="t-mark">(非 Windows)</span><br />
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UCS2<span class="t-mark">(Windows)</span></th>
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<td style="background: #90ff90; color: black; vertical-align: middle; text-align: center;" class="table-yes">
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<p><a href="cpp-string-multibyte-mbsrtowcs.html"><tt>mbsrtowcs</tt></a> / <a href="cpp-string-multibyte-wcsrtombs.html"><tt>wcsrtombs</tt></a><br />
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<a href="cpp-locale-use_facet.html"><tt>use_facet</tt></a><<a href="cpp-locale-codecvt.html"><tt>codecvt</tt></a><br />
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<wchar_t, char, mbstate_t>>(<a href="cpp-locale-locale.html"><tt>locale</tt></a>)</p>
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</td>
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<td style="background:#ff9090; color:black; vertical-align: middle; text-align: center;" class="table-no">无</td>
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<td style="background:#ff9090; color:black; vertical-align: middle; text-align: center;" class="table-no">无</td>
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</tr>
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</table>
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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="cpp-locale-wbuffer_convert.html"><span class="t-lines"><span>wbuffer_convert</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark">(C++17 中弃用)</span></span></span></div>
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</div>
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</td>
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<td>进行字节流缓冲区和宽流缓冲区间的转换<br />
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<span class="t-mark">(类模板)</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="cpp-locale-codecvt_utf8.html"><span class="t-lines"><span>codecvt_utf8</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-deprecated-cxx17">(C++17 中弃用)</span></span></span></div>
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</div>
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</td>
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<td>在 UTF-8 与 UCS2/UCS4 间转换<br />
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<span class="t-mark">(类模板)</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="cpp-locale-codecvt_utf8_utf16.html"><span class="t-lines"><span>codecvt_utf8_utf16</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-deprecated-cxx17">(C++17 中弃用)</span></span></span></div>
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</div>
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</td>
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<td>在 UTF-8 与 UTF-16 间转换<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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