75 lines
3.9 KiB
HTML
75 lines
3.9 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::fwide</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_c_fwide skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>fwide</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-io.html">io</a>‎ | <a href="cpp-io-c.html">c</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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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dsc-header">
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<td>
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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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</td>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> fwide<span class="br0">(</span> <a href="cpp-io-c.html"><span class="kw1877">std::<span class="me2">FILE</span></span></a><span class="sy2">*</span> stream, <span class="kw4">int</span> mode <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td class="t-dcl-nopad"></td>
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<td></td>
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<td></td>
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<p>若 <code>mode > 0</code> ，则试图令 <code>stream</code> 为宽面向。若 <code>mode < 0</code> ，则试图令 <code>stream</code> 为字节面向。若 <span class="t-c"><span class="mw-geshi cpp source-cpp">mode<span class="sy1">==</span><span class="nu0">0</span></span></span> ，则只查询流的当前面向。</p>
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<p>若流的当前面向已决定（通过执行输出或通过之前调用 fwide ），则此函数不做任何事。</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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<tr class="t-par">
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<td>stream</td>
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<td>-</td>
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<td>指向要修改或查询的 C I/O 流的指针</td>
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</tr>
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<tr class="t-par">
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<td>mode</td>
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<td>-</td>
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<td>大于零的整数值设置流为宽，小于零者设置流为窄，零值仅查询</td>
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</tr>
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</table>
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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>若此调用后流为宽面向则为大于零的整数，若此调用后流为字节面向则为小于零的整数，若流无面向则为零。</p>
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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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<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-io-c-fopen.html"><span class="t-lines"><span>fopen</span></span></a></div>
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</div>
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</td>
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<td>打开文件<br />
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<span class="t-mark">(函数)</span></td>
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</table>
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</div>
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