115 lines
5.5 KiB
HTML
115 lines
5.5 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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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::ftell</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_c_ftell skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>ftell</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-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">long</span> ftell<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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</table>
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<p>返回文件流 <code>stream</code> 的文件位置指示器的当前值。</p>
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<p>若流以二进制模式打开，则此函数获得的值是距文件起始的字节数。</p>
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<p>若流以文本模式打开，则此函数的返回值是未指定的，而且仅若作为 <span class="t-lc"><a href="cpp-io-c-fseek.html">std::fseek</a></span> 的输入才有意义。</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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<td>stream</td>
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<td>-</td>
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<td>要检验的文件流</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>成功时为文件位置指示器，若失败出现则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span><span class="nu0">1L</span></span></span> 。失败时亦设置 <span class="t-lc"><a href="cpp-error-errno.html">errno</a></span> 。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0_2">参数</span></h3>
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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<td class="mbox-empty-cell"></td>
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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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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-c-fgetpos.html"><span class="t-lines"><span>fgetpos</span></span></a></div>
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</div>
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</td>
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<td>获取文件位置指示器<br />
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<span class="t-mark">(函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-c-fseek.html"><span class="t-lines"><span>fseek</span></span></a></div>
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</div>
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</td>
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<td>移动文件位置指示器到文件中的指定位置<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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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-c-fsetpos.html"><span class="t-lines"><span>fsetpos</span></span></a></div>
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</div>
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</td>
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<td>移动文件位置指示器到文件中的指定位置<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_istream-tellg.html"><span class="t-lines"><span>tellg</span></span></a></div>
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</div>
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</td>
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<td>返回输入位置指示器<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></code> 的公开成员函数)</span></td>
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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_ostream-tellp.html"><span class="t-lines"><span>tellp</span></span></a></div>
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</div>
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</td>
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<td>返回输出位置指示器<br />
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<span class="t-mark">(<code>std::basic_ostream<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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