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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_filebuf&lt;CharT,Traits&gt;::</span>seekoff</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-io.html">io</a>&lrm; | <a href="cpp-io-basic_filebuf.html">basic filebuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br /></span>
<p><span class="kw1">virtual</span> pos_type seekoff<span class="br0">(</span> off_type off,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <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>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <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> <a href="cpp-io-ios_base-openmode.html"><span class="kw1674">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">in</span></span></a> <span class="sy3">|</span> <a href="cpp-io-ios_base-openmode.html"><span class="kw1675">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">out</span></span></a> <span class="br0">)</span><span class="sy4">;</span></div>
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<p>&#33509;&#21487;&#33021;&#65292;&#21017;&#37325;&#23547;&#20301;&#25991;&#20214;&#25351;&#38024;&#21040;&#36317;&#25991;&#20214;&#36215;&#22987;&#12289;&#32467;&#23614;&#25110;&#24403;&#21069;&#20301;&#32622;&#20934;&#30830; <code>off</code> &#20010;&#23383;&#31526;&#30340;&#20301;&#32622;&#65288;&#21462;&#20915;&#20110; <code>dir</code> &#30340;&#20540;&#65289;&#12290;</p>
<p>&#33509;&#20851;&#32852;&#25991;&#20214;&#26410;&#25171;&#24320;&#65288; <span class="t-c"><span class="mw-geshi cpp source-cpp">is_open<span class="br0">(</span><span class="br0">)</span><span class="sy1">==</span><span class="kw2">false</span></span></span> &#65289;&#65292;&#21017;&#31435;&#21363;&#22833;&#36133;&#12290;</p>
<p>&#33509;&#22810;&#23383;&#33410;&#23383;&#31526;&#32534;&#30721;&#20381;&#36182;&#29366;&#24577;&#65288; <a href="cpp-locale-codecvt-encoding.html"><tt>codecvt::encoding()</tt></a> &#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span><span class="nu0">1</span></span></span> &#65289;&#25110;&#20026;&#21464;&#38271;&#65288; <code>codecvt::encoding()</code> &#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#65289;&#65292;&#32780;&#20559;&#31227; <code>off</code> &#38750; <span class="t-c"><span class="mw-geshi cpp source-cpp">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#65292;&#21017;&#31435;&#21363;&#22833;&#36133;&#65306;&#27492;&#20989;&#25968;&#26080;&#27861;&#30830;&#23450;&#23545;&#24212; <code>off</code> &#20010;&#23383;&#31526;&#30340;&#23383;&#33410;&#25968;&#12290;</p>
<p>&#33509; <code>dir</code> &#19981;&#26159; <span class="t-lc"><a href="cpp-io-ios_base-seekdir.html">std::basic_ios::cur</a></span> &#25110;&#20559;&#31227; <code>off</code> &#38750; <span class="t-c"><span class="mw-geshi cpp source-cpp">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#65292;&#19988;&#27492; filebuf &#23545;&#35937;&#19978;&#26368;&#36817;&#20570;&#30340;&#25805;&#20316;&#26159;&#36755;&#20986;&#65288;&#21363;&#25918;&#32622;&#32531;&#20914;&#21306;&#38750;&#31354;&#65292;&#25110;&#26368;&#36817;&#35843;&#29992;&#30340;&#20989;&#25968;&#26159; <span class="t-lc"><a href="cpp-io-basic_streambuf-overflow.html">overflow()</a></span> &#65289;&#65292;&#21017;&#35843;&#29992; <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></span> &#30830;&#23450;&#38656;&#35201;&#30340;&#21453;&#36801;&#31227;&#24207;&#21015;&#65292;&#24182;&#36890;&#36807;&#35843;&#29992; <span class="t-lc"><a href="cpp-io-basic_streambuf-overflow.html">overflow()</a></span> &#20889;&#20837;&#35813;&#24207;&#21015;&#21040;&#25991;&#20214;&#12290;</p>
<p>&#28982;&#21518;&#36716;&#25442;&#21442;&#25968; <code>dir</code> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span></span></span> &#31867;&#22411;&#20540; <code>whence</code> &#22914;&#19979;&#65306;</p>
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td><code>dir</code> &#30340;&#20540;</td>
<td><code>whence</code> &#30340;&#20540;</td>
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<tr class="t-dsc">
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ios</span><span class="sy4">::</span><span class="me2">beg</span></span></span></td>
<td><span class="t-lc"><a href="cpp-io-c.html">SEEK_SET</a></span></td>
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<tr class="t-dsc">
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ios</span><span class="sy4">::</span><span class="me2">end</span></span></span></td>
<td><span class="t-lc"><a href="cpp-io-c.html">SEEK_END</a></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ios</span><span class="sy4">::</span><span class="me2">cur</span></span></span></td>
<td><span class="t-lc"><a href="cpp-io-c.html">SEEK_CUR</a></span></td>
</tr>
</table>
<p>&#28982;&#21518;&#65292;&#33509;&#23383;&#31526;&#32534;&#30721;&#20026;&#23450;&#23485;&#65288; <code>codecvt::encoding()</code> &#36820;&#22238;&#26576;&#20010;&#27491;&#20540; <code>width</code> &#65289;&#65292;&#21017;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fseek.html"><span class="kw1867">std::<span class="me2">fseek</span></span></a><span class="br0">(</span>file, width<span class="sy2">*</span>off, whence<span class="br0">)</span></span></span> &#31227;&#21160;&#25991;&#20214;&#25351;&#38024;&#12290;</p>
<p>&#21542;&#21017;&#65292;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fseek.html"><span class="kw1867">std::<span class="me2">fseek</span></span></a><span class="br0">(</span>file, <span class="nu0">0</span>, whence<span class="br0">)</span></span></span> &#31227;&#21160;&#25991;&#20214;&#25351;&#38024;&#12290;</p>
<p>&#22522;&#31867;&#20989;&#25968;&#31614;&#21517;&#25152;&#35201;&#27714;&#30340; <code>openmode</code> &#21442;&#25968;&#36890;&#24120;&#34987;&#24573;&#30053;&#65292;&#22240;&#20026; <code>std::basic_filebuf</code> &#21482;&#32500;&#25252;&#19968;&#20010;&#25991;&#20214;&#20301;&#32622;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>off</td>
<td>-</td>
<td>&#35201;&#35774;&#32622;&#20301;&#32622;&#25351;&#31034;&#22120;&#21040;&#30340;&#30456;&#23545;&#20301;&#32622;&#12290;</td>
</tr>
<tr class="t-par">
<td>dir</td>
<td>-</td>
<td>&#23450;&#20041;&#35201;&#24212;&#29992;&#30456;&#23545;&#20559;&#31227;&#21040;&#30340;&#22522;&#20301;&#32622;&#12290;&#23427;&#33021;&#20026;&#19979;&#21015;&#24120;&#37327;&#20043;&#19968;&#65306;
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td>&#24120;&#37327;</td>
<td>&#35299;&#37322;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-seekdir.html"><tt>beg</tt></a></td>
<td>&#27969;&#30340;&#24320;&#22987;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-seekdir.html"><tt>end</tt></a></td>
<td>&#27969;&#30340;&#32467;&#23614;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-seekdir.html"><tt>cur</tt></a></td>
<td>&#27969;&#20301;&#32622;&#25351;&#31034;&#22120;&#30340;&#24403;&#21069;&#20301;&#32622;</td>
</tr>
</table>
</td>
</tr>
<tr class="t-par">
<td>which</td>
<td>-</td>
<td>&#23450;&#20041;&#35201;&#24433;&#21709;&#36755;&#20837;&#21644;/&#25110;&#36755;&#20986;&#24207;&#21015;&#30340;&#21738;&#19968;&#20010;&#12290;&#23427;&#33021;&#20026;&#19979;&#21015;&#24120;&#37327;&#20043;&#19968;&#25110;&#20854;&#32452;&#21512;&#65306;
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td>&#24120;&#37327;</td>
<td>&#35299;&#37322;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>in</tt></a></td>
<td>&#24433;&#21709;&#36755;&#20837;&#24207;&#21015;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>out</tt></a></td>
<td>&#24433;&#21709;&#36755;&#20986;&#24207;&#21015;</td>
</tr>
</table>
</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#26032;&#26500;&#36896;&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp">pos_type</span></span> &#31867;&#22411;&#23545;&#35937;&#65292;&#23384;&#20648;&#32467;&#26524;&#25991;&#20214;&#20301;&#32622;&#65292;&#25110;&#22312;&#22833;&#36133;&#26102;&#20026; <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> &#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p><code>seekoff()</code> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_streambuf</span><span class="sy4">::</span><span class="me2">pubseekoff</span></span></span> &#25152;&#35843;&#29992;&#65292;&#23427;&#21448;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_istream</span><span class="sy4">::</span><span class="me2">seekg</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ostream</span><span class="sy4">::</span><span class="me2">seekp</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_istream</span><span class="sy4">::</span><span class="me2">tellg</span></span></span> &#21644; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ostream</span><span class="sy4">::</span><span class="me2">tellp</span></span></span> &#25152;&#35843;&#29992;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;fstream&gt;</span>
<span class="co2">#include &lt;locale&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#20934;&#22791; 10 &#23383;&#33410;&#25991;&#20214;&#65292;&#20445;&#26377; 4 &#20010; UTF8 &#20013;&#30340;&#23383;&#31526;</span>
<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a><span class="br0">(</span><span class="st0">&quot;text.txt&quot;</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> u8<span class="st0">&quot;z<span class="es3">\u00df</span><span class="es3">\u6c34</span><span class="es4">\U0001d10b</span>&quot;</span><span class="sy4">;</span> <span class="co1">// &#25110; u8&quot;z&szlig;&#27700;&#119051;&quot;</span>
<span class="co1">// &#25110; &quot;\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b&quot;;</span>
<span class="co1">// &#29992;&#38750;&#36716;&#25442;&#32534;&#30721;&#25171;&#24320;</span>
<a href="cpp-io-basic_ifstream.html"><span class="kw1732">std::<span class="me2">ifstream</span></span></a> f1<span class="br0">(</span><span class="st0">&quot;text.txt&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;f1&#39;s locale&#39;s encoding() returns &quot;</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-locale-use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="cpp-locale-codecvt.html"><span class="kw1939">std::<span class="me2">codecvt</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span>, <span class="kw4">char</span>, <a href="cpp-string-multibyte-mbstate_t.html"><span class="kw1179">std::<span class="me2">mbstate_t</span></span></a><span class="sy1">&gt;&gt;</span><span class="br0">(</span>f1.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">encoding</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;pubseekoff(3, beg) returns &quot;</span> <span class="sy1">&lt;&lt;</span> f1.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">&gt;</span>pubseekoff<span class="br0">(</span><span class="nu0">3</span>, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1703">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">beg</span></span></a><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;pubseekoff(0, end) returns &quot;</span> <span class="sy1">&lt;&lt;</span> f1.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">&gt;</span>pubseekoff<span class="br0">(</span><span class="nu0">0</span>, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1705">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">end</span></span></a><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;;</span>
<span class="co1">// &#29992; UTF-8 &#25171;&#24320;</span>
<a href="cpp-io-basic_ifstream.html"><span class="kw1746">std::<span class="me2">wifstream</span></span></a> f2<span class="br0">(</span><span class="st0">&quot;text.txt&quot;</span><span class="br0">)</span><span class="sy4">;</span>
f2.<span class="me1">imbue</span><span class="br0">(</span><a href="cpp-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="st0">&quot;en_US.UTF-8&quot;</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;f2&#39;s locale&#39;s encoding() returns &quot;</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-locale-use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="cpp-locale-codecvt.html"><span class="kw1939">std::<span class="me2">codecvt</span></span></a><span class="sy1">&lt;</span><span class="kw4">wchar_t</span>, <span class="kw4">char</span>, <a href="cpp-string-multibyte-mbstate_t.html"><span class="kw1179">std::<span class="me2">mbstate_t</span></span></a><span class="sy1">&gt;&gt;</span><span class="br0">(</span>f2.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">encoding</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;pubseekoff(3, beg) returns &quot;</span> <span class="sy1">&lt;&lt;</span> f2.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">&gt;</span>pubseekoff<span class="br0">(</span><span class="nu0">3</span>, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1703">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">beg</span></span></a><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;pubseekoff(0, end) returns &quot;</span> <span class="sy1">&lt;&lt;</span> f2.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">&gt;</span>pubseekoff<span class="br0">(</span><span class="nu0">0</span>, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1705">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">end</span></span></a><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">f1&#39;s locale&#39;s encoding() returns 1
pubseekoff(3, beg) returns 3
pubseekoff(0, end) returns 10
f2&#39;s locale&#39;s encoding() returns 0
pubseekoff(3, beg) returns -1
pubseekoff(0, end) returns 10</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_streambuf-pubseekoff.html"><span class="t-lines"><span>pubseekoff</span></span></a></div>
</div>
</td>
<td>&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">seekoff<span class="br0">(</span><span class="br0">)</span></span></span><br />
<span class="t-mark">(<code>std::basic_streambuf&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_filebuf-seekpos.html"><span class="t-lines"><span>seekpos</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34394;]</span></span></span></div>
</div>
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<td>&#29992;&#32477;&#23545;&#23547;&#22336;&#37325;&#23547;&#20301;&#25991;&#20214;&#20301;&#32622;<br />
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