82 lines
4.8 KiB
HTML
82 lines
4.8 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::fflush</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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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_c_fflush 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>fflush</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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<div>定义于头文件 <code><a href="cpp-header-cstdio.html"><cstdio></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> fflush<span class="br0">(</span> <a href="cpp-io-c.html"><span class="kw1876">std::<span class="me2">FILE</span></span></a><span class="sy2">*</span> stream <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td></td>
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<p>对于输出流（和最近操作为输出的更新流），将来自 <code>stream</code> 缓冲区的未写入数据写入关联的输出设备。</p>
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<p>对于输入流（和最近操作为输入的更新流），行为未定义。</p>
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<p>若 <code>stream</code> 为空指针，则冲入所有打开的输出流，包含在库包内操作，或其他情况下程序不能直接访问的流。</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>要写入的文件流</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>成功时返回零。否则返回 <span class="t-lc"><a href="cpp-io-c.html">EOF</a></span> 并设置文件流的错误指示器。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>POSIX 通过定义其在输入流上的效果<a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/fflush.html">扩展 fflush 的规定</a>，只要该流表示文件或另一可寻位设备：该情况下重定位 POSIX 文件指针以匹配 C 流指针（等效地撤销任何读缓冲）并舍弃任何未从流回读的 <span class="t-lc"><a href="cpp-io-c-ungetc.html">std::ungetc</a></span> 或 <span class="t-lc"><a href="cpp-io-c-ungetwc.html">std::ungetwc</a></span> 的效果。</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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<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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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-c-fclose.html"><span class="t-lines"><span>fclose</span></span></a></div>
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</div>
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</td>
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<td>关闭文件<br />
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<span class="t-mark">(函数)</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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