80 lines
7.1 KiB
HTML
80 lines
7.1 KiB
HTML
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<title>std::basic_filebuf<CharT,Traits>::close</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_filebuf_close skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_filebuf<CharT,Traits>::</span>close</h1>
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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-basic_filebuf.html">basic filebuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_filebuf.html"><span class="kw1667">std::<span class="me2">basic_filebuf</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> close<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>若放置区存在（即为写入打开文件），则首先调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">overflow<span class="br0">(</span>Traits<span class="sy4">::</span><span class="me2">eof</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> 写入所有未决输出到文件，包含任何反迁移序列。</p>
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<p>若在 <span class="t-lc"><a href="cpp-io-basic_streambuf-underflow.html">underflow()</a></span> 、 <span class="t-lc"><a href="cpp-io-basic_streambuf-overflow.html">overflow()</a></span> 、 <span class="t-lc"><a href="cpp-io-basic_streambuf-pubseekpos.html">seekpos()</a></span> 和 <span class="t-lc"><a href="cpp-io-basic_streambuf-pubseekoff.html">seekoff()</a></span> 之中最近调用的函数是 <span class="t-lc"><a href="cpp-io-basic_streambuf-overflow.html">overflow()</a></span> ，则可能多次调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">codecvt</span><span class="sy4">::</span><span class="me2">unshift</span><span class="br0">(</span><span class="br0">)</span></span></span> 以确定按照感染的本地环境的反迁移序列，并将该序列以 <span class="t-c"><span class="mw-geshi cpp source-cpp">overflow<span class="br0">(</span>Traits<span class="sy4">::</span><span class="me2">eof</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> 写入文件。</p>
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<p>然后，如同用 <span class="t-lc"><a href="cpp-io-c-fclose.html">std::fclose()</a></span> 关闭文件，不考虑任何之前调用成功或失败。</p>
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<p>若作出的任何函数调用，包含对 <span class="t-lc"><a href="cpp-io-c-fclose.html">std::fclose()</a></span> 的调用失败，则返回空指针。若作出的任何函数调用抛出异常，则捕捉该异常并在调用 <span class="t-lc"><a href="cpp-io-c-fclose.html">std::fclose()</a></span> 后重抛。若该文件已关闭，则立即返回空指针。</p>
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<p>任何情况下，都更新 <span class="t-lc"><a href="cpp-io-basic_filebuf-is_open.html">is_open()</a></span> 所访问的私有成员变量。</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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<p>（无）</p>
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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">this</span></span> ，失败时为空指针。</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><code>close()</code> 典型地通过 <span class="t-lc"><a href="cpp-io-basic_filebuf.html">std::basic_filebuf</a></span> 的析构函数调用（继而典型地为 <span class="t-lc"><a href="cpp-io-basic_fstream.html">std::basic_fstream</a></span> 的析构函数所调用）。</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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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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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><a href="cpp-io-basic_filebuf-is_open.html"><span class="t-lines"><span>is_open</span></span></a></div>
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</td>
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<td>检查关联文件是否打开<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-io-basic_filebuf-~basic_filebuf.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>析构 basic_filebuf 对象并且若打开则关闭文件<br />
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<span class="t-mark">(虚公开成员函数)</span></td>
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