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klarkxy
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<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>fwide</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_io_fwide skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading">fwide</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-io.html">io</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody>
<tr class="t-dsc-header">
<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;wchar.h&gt;</code></div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-c95">
<td>
<div><span class="mw-geshi c source-c"><span class="kw4">int</span> fwide<span class="br0">(</span> <a href="c-io.html"><span class="kw884">FILE</span></a> <span class="sy2">*</span>stream, <span class="kw4">int</span> mode <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-c95">(C95 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#33509; <code>mode &gt; 0</code> &#65292;&#21017;&#35797;&#22270;&#20196; <code>stream</code> &#20026;&#23485;&#38754;&#21521;&#12290;&#33509; <code>mode &lt; 0</code> &#65292;&#21017;&#35797;&#22270;&#20196; <code>stream</code> &#20026;&#23383;&#33410;&#38754;&#21521;&#12290;&#33509; <span class="t-c"><span class="mw-geshi c source-c">mode<span class="sy1">==</span><span class="nu0">0</span></span></span> &#65292;&#21017;&#21482;&#26597;&#35810;&#27969;&#30340;&#24403;&#21069;&#38754;&#21521;&#12290;</p>
<p>&#33509;&#27969;&#30340;&#24403;&#21069;&#38754;&#21521;&#24050;&#20915;&#23450;&#65288;&#36890;&#36807;&#25191;&#34892;&#36755;&#20986;&#25110;&#36890;&#36807;&#20043;&#21069;&#35843;&#29992; fwide &#65289;&#65292;&#21017;&#27492;&#20989;&#25968;&#19981;&#20570;&#20219;&#20309;&#20107;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>stream</td>
<td>-</td>
<td>&#25351;&#21521;&#20462;&#25913;&#25110;&#26597;&#35810;&#30340; C I/O &#27969;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>mode</td>
<td>-</td>
<td>&#22823;&#20110;&#38646;&#30340;&#25972;&#25968;&#20540;&#35774;&#32622;&#27969;&#20026;&#23485;&#65292;&#23567;&#20110;&#38646;&#30340;&#25972;&#25968;&#20540;&#35774;&#32622;&#27969;&#20026;&#31364;&#65292;&#38646;&#20026;&#20165;&#26597;&#35810;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509;&#27969;&#22312;&#27492;&#35843;&#29992;&#21518;&#20026;&#38754;&#21521;&#23485;&#65292;&#21017;&#20026;&#22823;&#20110;&#38646;&#30340;&#25972;&#25968;&#65292;&#33509;&#27969;&#22312;&#27492;&#35843;&#29992;&#21518;&#20026;&#38754;&#21521;&#23383;&#33410;&#65292;&#21017;&#20026;&#23567;&#20110;&#38646;&#30340;&#25972;&#25968;&#65292;&#33509;&#27969;&#26080;&#38754;&#21521;&#65292;&#21017;&#20026;&#38646;&#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;&#20195;&#30721;&#35774;&#32622;&#24182;&#37325;&#32622;&#27969;&#38754;&#21521;&#12290;</p>
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="c source-c">
<pre class="de1"><span class="co2">#include &lt;wchar.h&gt;</span>
<span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;stdlib.h&gt;</span>
<span class="kw4">void</span> try_read<span class="br0">(</span><a href="c-io.html"><span class="kw884">FILE</span></a><span class="sy2">*</span> fp<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">int</span> c <span class="sy1">=</span> <a href="c-io-fgetc.html"><span class="kw827">fgetc</span></a><span class="br0">(</span>fp<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>c <span class="sy1">==</span> <a href="c-io.html"><span class="kw889">EOF</span></a><span class="br0">)</span> <a href="c-io-puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">&quot;narrow character read failed&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span> <a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;narrow character read &#39;%c&#39;<span class="es1">\n</span>&quot;</span>, c<span class="br0">)</span><span class="sy4">;</span>
wint_t wc <span class="sy1">=</span> <a href="c-io-fgetwc.html"><span class="kw838">fgetwc</span></a><span class="br0">(</span>fp<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>wc <span class="sy1">==</span> WEOF<span class="br0">)</span> <a href="c-io-puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">&quot;wide character read failed&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span> <a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;wide character read &#39;%lc&#39;<span class="es1">\n</span>&quot;</span>, wc<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">void</span> show<span class="br0">(</span><span class="kw4">int</span> n<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">if</span><span class="br0">(</span>n <span class="sy1">==</span> <span class="nu0">0</span><span class="br0">)</span> <a href="c-io-puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">&quot;no orientation&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span> <span class="kw1">if</span> <span class="br0">(</span>n <span class="sy1">&lt;</span> <span class="nu0">0</span><span class="br0">)</span> <a href="c-io-puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">&quot;narrow orientation&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span> <a href="c-io-puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">&quot;wide orientation&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="c-io.html"><span class="kw884">FILE</span></a><span class="sy2">*</span> fp <span class="sy1">=</span> <a href="c-io-fopen.html"><span class="kw819">fopen</span></a><span class="br0">(</span><span class="st0">&quot;main.cpp&quot;</span>,<span class="st0">&quot;r&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span>fp<span class="br0">)</span> <span class="br0">{</span>
<a href="c-io-perror.html"><span class="kw879">perror</span></a><span class="br0">(</span><span class="st0">&quot;fopen() failed&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> <a href="c-program-EXIT_status.html"><span class="kw494">EXIT_FAILURE</span></a><span class="sy4">;</span>
<span class="br0">}</span>
<span class="co1">// &#26032;&#24320;&#30340;&#27969;&#26080;&#38754;&#21521;&#12290;</span>
show<span class="br0">(</span>fwide<span class="br0">(</span>fp, <span class="nu0">0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#24314;&#31435;&#38754;&#21521;&#23383;&#33410;&#12290;</span>
show<span class="br0">(</span>fwide<span class="br0">(</span>fp, <span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
try_read<span class="br0">(</span>fp<span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#21482;&#26377;freopen()&#33021;&#37325;&#32622;&#27969;&#38754;&#21521;&#12290;</span>
<span class="kw1">if</span> <span class="br0">(</span><a href="c-io-freopen.html"><span class="kw820">freopen</span></a><span class="br0">(</span><span class="st0">&quot;main.cpp&quot;</span>,<span class="st0">&quot;r&quot;</span>,fp<span class="br0">)</span> <span class="sy1">==</span> <a href="c-types-NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span>
<span class="br0">{</span>
<a href="c-io-perror.html"><span class="kw879">perror</span></a><span class="br0">(</span><span class="st0">&quot;freopen() failed&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> <a href="c-program-EXIT_status.html"><span class="kw494">EXIT_FAILURE</span></a><span class="sy4">;</span>
<span class="br0">}</span>
<span class="co1">// &#37325;&#24320;&#30340;&#27969;&#26080;&#38754;&#21521;&#12290;</span>
show<span class="br0">(</span>fwide<span class="br0">(</span>fp, <span class="nu0">0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#24314;&#31435;&#38754;&#21521;&#23485;&#12290;</span>
show<span class="br0">(</span>fwide<span class="br0">(</span>fp, <span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
try_read<span class="br0">(</span>fp<span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fclose.html"><span class="kw822">fclose</span></a><span class="br0">(</span>fp<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">no orientation
narrow orientation
narrow character read &#39;#&#39;
wide character read failed
no orientation
wide orientation
narrow character read failed
wide character read &#39;#&#39;</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-11">
<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.29.3.5 The fwide function (p: 423)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.24.3.5 The fwide function (p: 369)</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-io-fopen.html"><span class="t-lines"><span>fopen</span><span>fopen_s</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
</div>
</td>
<td>&#25171;&#24320;&#25991;&#20214;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>