119 lines
7.9 KiB
HTML
119 lines
7.9 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::fclose</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_fclose 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>fclose</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-cstdio.html"><cstdio></a></code></div>
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</td>
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<td></td>
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<td></td>
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<tr class="t-dcl">
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<td class="t-dcl-nopad">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> fclose<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 class="t-dcl-nopad"></td>
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<td class="t-dcl-nopad"></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>关闭给定的文件流。冲入任何未写入的缓冲数据到 OS 。舍弃任何未读取的缓冲数据。</p>
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<p>无论操作是否成功，流都不再关联到文件，且由 <span class="t-lc"><a href="cpp-io-c-setbuf.html">std::setbuf</a></span> 或 <span class="t-lc"><a href="cpp-io-c-setvbuf.html">std::setvbuf</a></span> 分配的缓冲区若存在，则亦被解除关联，并且若使用自动分配则被解分配。</p>
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<p>若在 <code>fclose</code> 返回后使用 <code>stream</code> 的值则行为未定义。</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>要关闭的文件流</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>成功时为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span> ，否则为 <span class="t-lc"><a href="cpp-io-c.html">EOF</a></span> 。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <cstdio></span>
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<span class="co2">#include <cstdlib></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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FILE<span class="sy2">*</span> fp <span class="sy1">=</span> <a href="cpp-io-c-fopen.html"><span class="kw1813">std::<span class="me2">fopen</span></span></a><span class="br0">(</span><span class="st0">"test.txt"</span>, <span class="st0">"r"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">if</span><span class="br0">(</span><span class="sy3">!</span>fp<span class="br0">)</span> <span class="br0">{</span>
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<a href="cpp-io-c-perror.html"><span class="kw1872">std::<span class="me2">perror</span></span></a><span class="br0">(</span><span class="st0">"File opening failed"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">return</span> <a href="cpp-utility-program-EXIT_status.html"><span class="kw973">EXIT_FAILURE</span></a><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">int</span> c<span class="sy4">;</span> <span class="co1">// 注意：是 int 而非 char ，要求处理 EOF</span>
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<span class="kw1">while</span> <span class="br0">(</span><span class="br0">(</span>c <span class="sy1">=</span> <a href="cpp-io-c-fgetc.html"><span class="kw1820">std::<span class="me2">fgetc</span></span></a><span class="br0">(</span>fp<span class="br0">)</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> <a href="cpp-io-c.html"><span class="kw1881">EOF</span></a><span class="br0">)</span> <span class="br0">{</span> <span class="co1">// 标准 C I/O 文件读取循环</span>
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<a href="cpp-io-c-putchar.html"><span class="kw1828">std::<span class="me2">putchar</span></span></a><span class="br0">(</span>c<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">if</span> <span class="br0">(</span><a href="cpp-io-c-ferror.html"><span class="kw1871">std::<span class="me2">ferror</span></span></a><span class="br0">(</span>fp<span class="br0">)</span><span class="br0">)</span>
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<a href="cpp-io-c-puts.html"><span class="kw1829">std::<span class="me2">puts</span></span></a><span class="br0">(</span><span class="st0">"I/O error when reading"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">else</span> <span class="kw1">if</span> <span class="br0">(</span><a href="cpp-io-c-feof.html"><span class="kw1870">std::<span class="me2">feof</span></span></a><span class="br0">(</span>fp<span class="br0">)</span><span class="br0">)</span>
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<a href="cpp-io-c-puts.html"><span class="kw1829">std::<span class="me2">puts</span></span></a><span class="br0">(</span><span class="st0">"End of file reached successfully"</span><span class="br0">)</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">fclose</span><span class="br0">(</span>fp<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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</div>
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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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</tr>
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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-freopen.html"><span class="t-lines"><span>freopen</span></span></a></div>
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</div>
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</td>
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<td>以不同名称打开既存流<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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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-basic_filebuf-close.html"><span class="t-lines"><span>close</span></span></a></div>
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</div>
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</td>
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<td>冲入放置区缓冲区并关闭关联的文件<br />
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<span class="t-mark">(<code>std::basic_filebuf<CharT,Traits></code> 的公开成员函数)</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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</div>
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</div>
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</div>
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</body>
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</html>
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