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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_istream&lt;CharT,Traits&gt;::</span>seekg</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_istream.html">basic istream</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">basic_istream<span class="sy3">&amp;</span> seekg<span class="br0">(</span> pos_type pos <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">basic_istream<span class="sy3">&amp;</span> seekg<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<span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#35774;&#32622;&#24403;&#21069;&#20851;&#32852; <code>streambuf</code> &#23545;&#35937;&#30340;&#36755;&#20837;&#20301;&#32622;&#25351;&#31034;&#22120;&#65292;&#22833;&#36133;&#30340;&#24773;&#20917;&#19979;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">setstate<span class="br0">(</span><a href="cpp-io-ios_base-iostate.html"><span class="kw1700">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">failbit</span></span></a><span class="br0">)</span></span></span> &#12290;</p>
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<p>&#36827;&#34892;&#20219;&#20309;&#20854;&#20182;&#21160;&#20316;&#21069;&#65292; <code>seekg</code> &#28165;&#38500; <code>eofbit</code> &#12290;</p>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<p><code>seekg</code> &#34920;&#29616;&#20026;<a href="cpp-named_req-UnformattedInputFunction.html"><span style="font-style:italic">&#26080;&#26684;&#24335;&#36755;&#20837;&#20989;&#25968;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(UnformattedInputFunction)</span></a> &#65292;&#38500;&#20102;&#19981;&#24433;&#21709; <span class="t-lc"><a href="cpp-io-basic_istream-gcount.html">gcount()</a></span> &#12290;&#26500;&#36896;&#24182;&#26816;&#26597; sentry &#23545;&#35937;&#21518;&#65292;</p>
<div class="t-li1"><span class="t-li">1)</span> &#35774;&#32622;&#36755;&#20837;&#20301;&#32622;&#25351;&#31034;&#22120;&#20026;&#32477;&#23545;&#65288;&#30456;&#23545;&#20110;&#25991;&#20214;&#36215;&#22987;&#65289;&#20540; <code>pos</code> &#12290;&#20855;&#20307;&#32780;&#35328;&#65292;&#25191;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp">rdbuf<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">&gt;</span>pubseekpos<span class="br0">(</span>pos, <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="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#35774;&#32622;&#36755;&#20837;&#20301;&#32622;&#25351;&#31034;&#22120;&#20026;&#30456;&#23545;&#20110; <code>dir</code> &#25152;&#23450;&#20041;&#20301;&#32622;&#30340; <code>off</code> &#12290;&#20855;&#20307;&#32780;&#35328;&#65292;&#25191;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp">rdbuf<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">&gt;</span>pubseekoff<span class="br0">(</span>off, dir, <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="br0">)</span></span></span> &#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>pos</td>
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<td>&#35774;&#32622;&#36755;&#20837;&#20301;&#32622;&#25351;&#31034;&#22120;&#21040;&#30340;&#32477;&#23545;&#20301;&#32622;&#12290;</td>
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<td>off</td>
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<td>&#35774;&#32622;&#36755;&#20837;&#20301;&#32622;&#25351;&#31034;&#22120;&#21040;&#30340;&#30456;&#23545;&#20301;&#32622;&#12290;</td>
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<td>dir</td>
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<td>&#23450;&#20041;&#24212;&#29992;&#30456;&#23545;&#20559;&#31227;&#21040;&#30340;&#22522;&#20301;&#32622;&#12290;&#23427;&#33021;&#20026;&#19979;&#21015;&#24120;&#37327;&#20043;&#19968;&#65306;
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<td>&#24120;&#37327;</td>
<td>&#35299;&#37322;</td>
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<td><a href="cpp-io-ios_base-seekdir.html"><tt>beg</tt></a></td>
<td>&#27969;&#30340;&#24320;&#22987;</td>
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<td><a href="cpp-io-ios_base-seekdir.html"><tt>end</tt></a></td>
<td>&#27969;&#30340;&#32467;&#23614;</td>
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<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>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
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&#33509;&#20986;&#29616;&#38169;&#35823;&#65288;&#38169;&#35823;&#29366;&#24577;&#26631;&#24535;&#19981;&#26159; <span class="t-lc"><a href="cpp-io-ios_base-iostate.html">goodbit</a></span> &#65289;&#24182;&#19988;&#35774;&#32622;&#20102; <span class="t-lc"><a href="cpp-io-basic_ios-exceptions.html">exceptions()</a></span> &#20026;&#23545;&#35813;&#29366;&#24577;&#25243;&#20986;&#21017;&#20026; <span class="t-lc"><a href="cpp-io-ios_base-failure.html">failure</a></span> &#12290;
<p>&#33509;&#20869;&#37096;&#25805;&#20316;&#25243;&#20986;&#24322;&#24120;&#65292;&#21017;&#25429;&#33719;&#23427;&#24182;&#35774;&#32622; <span class="t-lc"><a href="cpp-io-ios_base-iostate.html">badbit</a></span> &#12290;&#33509;&#23545; <code>badbit</code> &#35774;&#32622;&#20102; <span class="t-lc"><a href="cpp-io-basic_ios-exceptions.html">exceptions()</a></span> &#65292;&#21017;&#37325;&#25243;&#35813;&#24322;&#24120;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;sstream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> str <span class="sy1">=</span> <span class="st0">&quot;Hello, world&quot;</span><span class="sy4">;</span>
<a href="cpp-io-basic_istringstream.html"><span class="kw1735">std::<span class="me2">istringstream</span></span></a> in<span class="br0">(</span>str<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> word1, word2<span class="sy4">;</span>
in <span class="sy1">&gt;&gt;</span> word1<span class="sy4">;</span>
in.<span class="me1">seekg</span><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#22238;&#28335;</span>
in <span class="sy1">&gt;&gt;</span> word2<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;word1 = &quot;</span> <span class="sy1">&lt;&lt;</span> word1 <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;word2 = &quot;</span> <span class="sy1">&lt;&lt;</span> word2 <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>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">word1 = Hello,
word2 = Hello,</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_istream-tellg.html"><span class="t-lines"><span>tellg</span></span></a></div>
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<td>&#36820;&#22238;&#36755;&#20837;&#20301;&#32622;&#25351;&#31034;&#22120;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_ostream-tellp.html"><span class="t-lines"><span>tellp</span></span></a></div>
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<td>&#36820;&#22238;&#36755;&#20986;&#20301;&#32622;&#25351;&#31034;&#22120;<br />
<span class="t-mark">(<code>std::basic_ostream&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_ostream-seekp.html"><span class="t-lines"><span>seekp</span></span></a></div>
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<td>&#35774;&#32622;&#36755;&#20986;&#20301;&#32622;&#25351;&#31034;&#22120;<br />
<span class="t-mark">(<code>std::basic_ostream&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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