159 lines
9.2 KiB
HTML
159 lines
9.2 KiB
HTML
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<title>std::basic_streambuf<CharT,Traits>::pubseekoff, std::basic_streambuf<CharT,Traits>::seekoff</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_streambuf_pubseekoff 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_streambuf<CharT,Traits>::</span>pubseekoff, <span style="font-size:0.7em; line-height:130%">std::basic_streambuf<CharT,Traits>::</span>seekoff</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_streambuf.html">basic streambuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">pos_type pubseekoff<span class="br0">(</span> off_type off, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1702">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">seekdir</span></span></a> dir,<br />
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<a href="cpp-io-ios_base-openmode.html"><span class="kw1671">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">openmode</span></span></a> which <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">in</span> <span class="sy3">|</span> ios_base<span class="sy4">::</span><span class="me2">out</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td class="t-dcl-nopad"></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br /></span>
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<p><span class="kw1">virtual</span> pos_type seekoff<span class="br0">(</span> off_type off, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1702">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">seekdir</span></span></a> dir,<br /></p>
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<a href="cpp-io-ios_base-openmode.html"><span class="kw1671">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">openmode</span></span></a> which <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">in</span> <span class="sy3">|</span> ios_base<span class="sy4">::</span><span class="me2">out</span> <span class="br0">)</span><span class="sy4">;</span></div>
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</td>
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<td>(2)</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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<p>相对某其他位置，设置输入和/或输出序列的位置指示器。</p>
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<p>1) 调用最终导出类的 <code>seekoff(off, dir, which)</code></p>
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<p>2) 此函数的基类版本无效果。导出类可覆写此函数以允许位置指示器的相对寻位。</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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<td>off</td>
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<td>-</td>
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<td>要设置位置指示器到的相对位置。</td>
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<tr class="t-par">
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<td>dir</td>
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<td>-</td>
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<td>定义要应用相对偏移到的基位置。它能为下列常量之一：
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<td>常量</td>
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<td>解释</td>
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<td><a href="cpp-io-ios_base-seekdir.html"><tt>beg</tt></a></td>
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<td>流的开始</td>
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<td><a href="cpp-io-ios_base-seekdir.html"><tt>end</tt></a></td>
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<td>流的结尾</td>
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<tr class="t-dsc">
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<td><a href="cpp-io-ios_base-seekdir.html"><tt>cur</tt></a></td>
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<td>流位置指示器的当前位置</td>
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</td>
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<tr class="t-par">
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<td>which</td>
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<td>-</td>
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<td>定义输入和/或输出序列何者有影响。它能为下列常量之一或其组合：
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<td>常量</td>
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<td>解释</td>
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<td><a href="cpp-io-ios_base-openmode.html"><tt>in</tt></a></td>
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<td>影响输入序列</td>
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</tr>
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<td><a href="cpp-io-ios_base-openmode.html"><tt>out</tt></a></td>
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<td>影响输出序列</td>
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</tr>
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</table>
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</td>
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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>并非所有参数组合都可以合法，细节见 <code>seekoff</code> 的导出类版本。</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>1) <code>seekoff(off, dir, which)</code> 的返回值</p>
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<p>2) 位置指示器所定义的结果绝对位置。基类版本返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">pos_type<span class="br0">(</span>off_type<span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span></span></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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<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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<div class="t-dsc-member-div">
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<div><a href="cpp-io-basic_streambuf-pubseekpos.html"><span class="t-lines"><span>pubseekpos</span></span></a></div>
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</div>
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</td>
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<td>调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">seekpos<span class="br0">(</span><span class="br0">)</span></span></span><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">
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<div><a href="cpp-io-basic_filebuf-seekoff.html"><span class="t-lines"><span>seekoff</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>用相对寻址重寻位文件位置<br />
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<span class="t-mark">(<code>std::basic_filebuf<CharT,Traits></code> 的虚受保护成员函数)</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-basic_stringbuf-seekoff.html"><span class="t-lines"><span>seekoff</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>用相对寻址，重定位输入序列、输出序列或两者中的下一位置指针<br />
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<span class="t-mark">(<code>std::basic_stringbuf<CharT,Traits,Allocator></code> 的虚受保护成员函数)</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-strstreambuf-seekoff.html"><span class="t-lines"><span>seekoff</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>用相对寻址重寻位输入序列、输出序列或两者中的下一位置指针<br />
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<span class="t-mark">(<code>std::strstreambuf</code> 的虚受保护成员函数)</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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