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<!DOCTYPE html>
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<title>std::codecvt_mode</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>codecvt_mode</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-locale.html">locale</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-codecvt.html">&lt;codecvt&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw2">enum</span> codecvt_mode <span class="br0">{</span><br /></span>
<p>&nbsp; &nbsp; consume_header <span class="sy1">=</span> <span class="nu0">4</span>,<br />
&nbsp; &nbsp; generate_header <span class="sy1">=</span> <span class="nu0">2</span>,<br />
&nbsp; &nbsp; little_endian <span class="sy1">=</span> <span class="nu0">1</span><br /></p>
<span class="br0">}</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark">(C++17 &#20013;&#24323;&#29992;)</span></td>
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<p>&#24179;&#38754; <span class="t-lc"><a href="cpp-locale-codecvt_utf8.html">std::codecvt_utf8</a></span> &#12289; <span class="t-lc"><a href="cpp-locale-codecvt_utf16.html">std::codecvt_utf16</a></span> &#21644; <span class="t-lc"><a href="cpp-locale-codecvt_utf8_utf16.html">std::codecvt_utf8_utf16</a></span> &#25509;&#21463;&#21487;&#36873;&#30340; <span class="t-lc"><strong class="selflink">std::codecvt_mode</strong></span> &#31867;&#22411;&#20540;&#20026;&#27169;&#26495;&#23454;&#21442;&#65292;&#36825;&#20250;&#25351;&#23450; unicode &#23383;&#31526;&#20018;&#36716;&#25442;&#30340;&#21487;&#36873;&#29305;&#24615;&#12290;</p>
<h3><span class="mw-headline" id=".E5.B8.B8.E9.87.8F">&#24120;&#37327;</span></h3>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-locale.html">&lt;locale&gt;</a></code></div>
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<td>&#20540;</td>
<td>&#21547;&#20041;</td>
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<td><code>little_endian</code></td>
<td>&#20551;&#35774;&#36755;&#20837;&#26159;&#23567;&#31471;&#24207;&#65288;&#20165;&#24212;&#29992;&#20110; UTF-16 &#65292;&#40664;&#35748;&#20026;&#22823;&#31471;&#24207;&#65289;</td>
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<td><code>consume_header</code></td>
<td>&#33509;&#36755;&#20837;&#24207;&#21015;&#30340;&#24320;&#22987;&#23384;&#22312;&#23383;&#33410;&#24207;&#26631;&#35760;&#65292;&#21017;&#28040;&#32791;&#23427;&#65292;&#32780;&#19988;&#65288;&#22312; UTF-16 &#30340;&#24773;&#20917;&#19979;&#65289;&#20381;&#36182;&#20110;&#20026;&#35299;&#30721;&#21097;&#19979;&#36755;&#20837;&#32780;&#25351;&#23450;&#30340;&#23383;&#33410;&#24207;</td>
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<td><code>generate_header</code></td>
<td>&#22312;&#36755;&#20986;&#24207;&#21015;&#30340;&#24320;&#22987;&#36755;&#20986;&#23383;&#33410;&#24207;&#26631;&#35760;</td>
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<p>&#21463;&#21040;&#36776;&#35748;&#30340;&#23383;&#33410;&#24207;&#26631;&#35760;&#20026;&#65306;</p>
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<td><code>0xfe 0xff</code></td>
<td>UTF-16 &#22823;&#31471;</td>
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<td><code>0xff 0xfe</code></td>
<td>UTF-16 &#23567;&#31471;</td>
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<td><code>0xef 0xbb 0xbf</code></td>
<td>UTF-8 &#65288;&#31471;&#24207;&#26080;&#24433;&#21709;&#65289;</td>
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<p>&#33509;&#22312;&#35835;&#20197;&#23383;&#33410;&#24207;&#26631;&#35760;&#24320;&#22987;&#30340;&#25991;&#20214;&#26102;&#26410;&#25351;&#23450; <span class="t-lc"><strong class="selflink">std::consume_header</strong></span> &#65292;&#21017;&#23558; Unicode &#23383;&#31526; U+FEFF &#65288;&#38646;&#23485;&#26080;&#20013;&#26029;&#31354;&#26684;&#65289;&#35835;&#20316;&#23383;&#31526;&#20018;&#20869;&#23481;&#30340;&#39318;&#23383;&#31526;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<p>&#19979;&#21015;&#31034;&#20363;&#28436;&#31034;&#28040;&#32791; UTF-8 BOM</p>
<div class="t-example-live-link"></div>
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;fstream&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;locale&gt;</span>
<span class="co2">#include &lt;codecvt&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#24102; BOM &#30340; UTF-8 &#25968;&#25454;</span>
<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a><span class="br0">(</span><span class="st0">&quot;text.txt&quot;</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> u8<span class="st0">&quot;<span class="es3">\ufeff</span>z<span class="es3">\u6c34</span><span class="es4">\U0001d10b</span>&quot;</span><span class="sy4">;</span>
<span class="co1">// &#35835; UTF8 &#25991;&#20214;&#65292;&#36339;&#36807; BOM</span>
<a href="cpp-io-basic_ifstream.html"><span class="kw1746">std::<span class="me2">wifstream</span></span></a> fin<span class="br0">(</span><span class="st0">&quot;text.txt&quot;</span><span class="br0">)</span><span class="sy4">;</span>
fin.<span class="me1">imbue</span><span class="br0">(</span><a href="cpp-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a><span class="br0">(</span>fin.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span>,
new <a href="cpp-locale-codecvt_utf8.html"><span class="kw1983">std::<span class="me2">codecvt_utf8</span></span></a><span class="sy1">&lt;</span><span class="kw4">wchar_t</span>, <span class="nu12">0x10ffff</span>, std<span class="sy4">::</span><span class="me2">consume_header</span><span class="sy1">&gt;</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">wchar_t</span> c<span class="sy4">;</span> fin.<span class="me1">get</span><span class="br0">(</span>c<span class="br0">)</span><span class="sy4">;</span> <span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-hex.html"><span class="kw1782">std::<span class="me2">hex</span></span></a> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-showbase.html"><span class="kw1766">std::<span class="me2">showbase</span></span></a> <span class="sy1">&lt;&lt;</span> c <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">0x7a
0x6c34
0x1d10b</pre></div>
</div>
</div>
<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-locale-codecvt.html"><span class="t-lines"><span>codecvt</span></span></a></div>
</div>
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<td>&#22312;&#23383;&#31526;&#32534;&#30721;&#38388;&#36716;&#25442;&#65292;&#21253;&#25324; UTF-8&#12289;UTF-16&#12289;UTF-32<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-locale-codecvt_utf8.html"><span class="t-lines"><span>codecvt_utf8</span></span></a></div>
<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 &#20013;&#24323;&#29992;)</span></span></span></div>
</div>
</td>
<td>&#22312; UTF-8 &#19982; UCS2/UCS4 &#38388;&#36716;&#25442;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-locale-codecvt_utf16.html"><span class="t-lines"><span>codecvt_utf16</span></span></a></div>
<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 &#20013;&#24323;&#29992;)</span></span></span></div>
</div>
</td>
<td>&#22312; UTF-16 &#19982; UCS2/UCS4 &#38388;&#36716;&#25442;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-locale-codecvt_utf8_utf16.html"><span class="t-lines"><span>codecvt_utf8_utf16</span></span></a></div>
<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 &#20013;&#24323;&#29992;)</span></span></span></div>
</div>
</td>
<td>&#22312; UTF-8 &#19982; UTF-16 &#38388;&#36716;&#25442;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
</tr>
</table>
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<div class="visualClear"></div>
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