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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>to_wstring</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-string.html">string</a>&lrm; | <a href="cpp-string-basic_string.html">basic string</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-string.html">&lt;string&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">int</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">long</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">long</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">unsigned</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">unsigned</span> <span class="kw4">long</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(6)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">float</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(7)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">double</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(8)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> to_wstring<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">double</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(9)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<p>&#36716;&#25442;&#25968;&#20540;&#20026; <span class="t-lc"><a href="cpp-string-basic_string.html">std::wstring</a></span> &#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#36716;&#25442;&#26377;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#20026;&#23485;&#23383;&#31526;&#20018;&#65292;&#20854;&#20869;&#23481;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fwprintf.html"><span class="kw1860">std::<span class="me2">swprintf</span></span></a><span class="br0">(</span>buf, sz, L<span class="st0">&quot;%d&quot;</span>, value<span class="br0">)</span></span></span> &#23545;&#20110;&#20805;&#20998;&#22823;&#30340; <code>buf</code> &#23558;&#20250;&#29983;&#25104;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#36716;&#25442;&#26377;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#20026;&#23485;&#23383;&#31526;&#20018;&#65292;&#20854;&#20869;&#23481;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fwprintf.html"><span class="kw1860">std::<span class="me2">swprintf</span></span></a><span class="br0">(</span>buf, sz, L<span class="st0">&quot;%ld&quot;</span>, value<span class="br0">)</span></span></span> &#23545;&#20110;&#20805;&#20998;&#22823;&#30340; <code>buf</code> &#23558;&#20250;&#29983;&#25104;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#36716;&#25442;&#26377;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#20026;&#23485;&#23383;&#31526;&#20018;&#65292;&#20854;&#20869;&#23481;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fwprintf.html"><span class="kw1860">std::<span class="me2">swprintf</span></span></a><span class="br0">(</span>buf, sz, L<span class="st0">&quot;%lld&quot;</span>, value<span class="br0">)</span></span></span> &#23545;&#20110;&#20805;&#20998;&#22823;&#30340; <code>buf</code> &#23558;&#20250;&#29983;&#25104;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#36716;&#25442;&#26080;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#20026;&#23485;&#23383;&#31526;&#20018;&#65292;&#20854;&#20869;&#23481;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fwprintf.html"><span class="kw1860">std::<span class="me2">swprintf</span></span></a><span class="br0">(</span>buf, sz, L<span class="st0">&quot;%u&quot;</span>, value<span class="br0">)</span></span></span> &#23545;&#20110;&#20805;&#20998;&#22823;&#30340; <code>buf</code> &#23558;&#20250;&#29983;&#25104;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">5)</span> &#36716;&#25442;&#26080;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#20026;&#23485;&#23383;&#31526;&#20018;&#65292;&#20854;&#20869;&#23481;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fwprintf.html"><span class="kw1860">std::<span class="me2">swprintf</span></span></a><span class="br0">(</span>buf, sz, L<span class="st0">&quot;%lu&quot;</span>, value<span class="br0">)</span></span></span> &#23545;&#20110;&#20805;&#20998;&#22823;&#30340; <code>buf</code> &#23558;&#20250;&#29983;&#25104;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">6)</span> &#36716;&#25442;&#26080;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#20026;&#23485;&#23383;&#31526;&#20018;&#65292;&#20854;&#20869;&#23481;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fwprintf.html"><span class="kw1860">std::<span class="me2">swprintf</span></span></a><span class="br0">(</span>buf, sz, L<span class="st0">&quot;%llu&quot;</span>, value<span class="br0">)</span></span></span> &#23545;&#20110;&#20805;&#20998;&#22823;&#30340; <code>buf</code> &#23558;&#20250;&#29983;&#25104;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">7,8)</span> &#36716;&#25442;&#28014;&#28857;&#20540;&#20026;&#23485;&#23383;&#31526;&#20018;&#65292;&#20854;&#20869;&#23481;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fwprintf.html"><span class="kw1860">std::<span class="me2">swprintf</span></span></a><span class="br0">(</span>buf, sz, L<span class="st0">&quot;%f&quot;</span>, value<span class="br0">)</span></span></span> &#23545;&#20110;&#20805;&#20998;&#22823;&#30340; <code>buf</code> &#23558;&#20250;&#29983;&#25104;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">9)</span> &#36716;&#25442;&#28014;&#28857;&#20540;&#20026;&#23485;&#23383;&#31526;&#20018;&#65292;&#20854;&#20869;&#23481;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fwprintf.html"><span class="kw1860">std::<span class="me2">swprintf</span></span></a><span class="br0">(</span>buf, sz, L<span class="st0">&quot;%Lf&quot;</span>, value<span class="br0">)</span></span></span> &#23545;&#20110;&#20805;&#20998;&#22823;&#30340; <code>buf</code> &#23558;&#20250;&#29983;&#25104;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>value</td>
<td>-</td>
<td>&#35201;&#36716;&#25442;&#30340;&#25968;&#20540;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#20445;&#26377;&#36716;&#25442;&#21518;&#20540;&#30340;&#23485;&#23383;&#31526;&#20018;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#20174; <span class="t-lc"><a href="cpp-string-basic_string.html">std::wstring</a></span> &#30340;&#26500;&#36896;&#20989;&#25968;&#25243;&#20986; <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> &#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>
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw4">double</span> f <span class="sy1">=</span> <span class="nu16">23.43</span><span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1232">std::<span class="me2">wstring</span></span></a> f_str <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_wstring</span><span class="br0">(</span>f<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">wcout</span></span></a> <span class="sy1">&lt;&lt;</span> f_str<span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">23.430000</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-string-basic_string-to_string.html"><span class="t-lines"><span>to_string</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#36716;&#25442;&#25972;&#25968;&#25110;&#28014;&#28857;&#20540;&#20026; <code>string</code><br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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