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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::strstreambuf::</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-strstreambuf.html">strstreambuf</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;ios_base<span class="sy4">::</span><span class="me2">seekdir</span> way,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;ios_base<span class="sy4">::</span><span class="me2">openmode</span> 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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<p>&#33509;&#21487;&#33021;&#65292;&#21017;&#37325;&#23547;&#20301; <span class="t-lc"><a href="cpp-io-basic_streambuf-gptr.html">std::basic_streambuf::gptr</a></span> &#21644;/&#25110; <span class="t-lc"><a href="cpp-io-basic_streambuf-pptr.html">std::basic_streambuf::pptr</a></span> &#21040;&#23545;&#24212;&#36317;&#32531;&#20914;&#30340;&#33719;&#21462;&#21644;/&#25110;&#25918;&#32622;&#21306;&#36215;&#22987;&#12289;&#32467;&#23614;&#25110;&#24403;&#21069;&#20301;&#32622;&#20934;&#30830; <code>off</code> &#20010;&#23383;&#31526;&#30340;&#20301;&#32622;&#12290;</p>
<ul>
<li>&#33509; <code>which</code> &#21253;&#21547; <code>ios_base::in</code> &#32780;&#27492;&#32531;&#20914;&#20026;&#35835;&#21462;&#25171;&#24320;&#65292;&#21017;&#20197;&#21518;&#36848;&#26041;&#24335;&#37325;&#23547;&#20301;&#33719;&#21462;&#21306;&#20869;&#30340;&#35835;&#25351;&#38024; <span class="t-lc"><a href="cpp-io-basic_streambuf-gptr.html">std::basic_streambuf::gptr</a></span></li>
<li>&#33509; <code>which</code> &#21253;&#21547; <code>ios_base::out</code> &#32780;&#27492;&#32531;&#20914;&#20026;&#20889;&#20837;&#25171;&#24320;&#65292;&#21017;&#20197;&#21518;&#36848;&#26041;&#24335;&#37325;&#23450;&#20301;&#25918;&#32622;&#21306;&#20869;&#30340;&#20889;&#25351;&#38024; <span class="t-lc"><a href="cpp-io-basic_streambuf-pptr.html">std::basic_streambuf::pptr</a></span></li>
<li>&#33509; <code>which</code> &#21253;&#21547; <code>ios_base::in</code> &#21644; <code>ios_base::out</code> &#20004;&#32773;&#65292;&#32780;&#32531;&#20914;&#20026;&#35835;&#21462;&#21644;&#20889;&#20837;&#20004;&#32773;&#25171;&#24320;&#65292;&#19988; <code>when</code> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">ios_base<span class="sy4">::</span><span class="me2">beg</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">ios_base<span class="sy4">::</span><span class="me2">end</span></span></span> &#65292;&#21017;&#20197;&#21518;&#36848;&#26041;&#24335;&#37325;&#23547;&#20301;&#35835;&#21644;&#20889;&#25351;&#38024;&#12290;</li>
<li>&#21542;&#21017;&#65292;&#27492;&#20989;&#25968;&#22833;&#36133;&#12290;</li>
</ul>
<p>&#33509;&#35201;&#37325;&#23547;&#20301;&#25351;&#38024;&#65288; <code>gptr</code> &#25110; <code>pptr</code> &#25110;&#20004;&#32773;&#65289;&#65292;&#21017;&#25353;&#19979;&#21015;&#26041;&#24335;&#36827;&#34892;&#65306;</p>
<div class="t-li1"><span class="t-li">1)</span> &#33509;&#35201;&#37325;&#23547;&#20301;&#30340;&#25351;&#38024;&#20026;&#31354;&#25351;&#38024;&#65292;&#32780;&#26032;&#20559;&#31227; <code>newoff</code> &#20250;&#20026;&#38750;&#38646;&#65292;&#21017;&#27492;&#20989;&#25968;&#22833;&#36133;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#30830;&#23450; <code>off_type</code> &#31867;&#22411;&#30340;&#26032;&#25351;&#38024;&#20559;&#31227; <code>newoff</code></div>
<div class="t-li2"><span class="t-li">a)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">way <span class="sy1">==</span> ios_base<span class="sy4">::</span><span class="me2">beg</span></span></span> &#65292;&#21017; <code>newoff</code> &#20026;&#38646;</div>
<div class="t-li2"><span class="t-li">b)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">way <span class="sy1">==</span> ios_base<span class="sy4">::</span><span class="me2">cur</span></span></span> &#65292;&#21017; <code>newoff</code> &#20026;&#25351;&#38024;&#30340;&#24403;&#21069;&#20301;&#32622;&#65288; <span class="t-c"><span class="mw-geshi cpp source-cpp">gptr<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span>eback<span class="br0">(</span><span class="br0">)</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">pptr<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span>pbase<span class="br0">(</span><span class="br0">)</span></span></span> &#65289;</div>
<div class="t-li2"><span class="t-li">c)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">way <span class="sy1">==</span> ios_base<span class="sy4">::</span><span class="me2">end</span></span></span> &#65292;&#21017; <code>newoff</code> &#26159;&#32531;&#20914;&#21306;&#30340;&#25972;&#20010;&#24050;&#21021;&#22987;&#21270;&#37096;&#20998;&#38271;&#24230;&#65288;&#33509;&#20351;&#29992;&#36807;&#20998;&#37197;&#65292;&#21017;&#20026;&#39640;&#27700;&#20301;&#25351;&#38024;&#20943;&#36215;&#22987;&#25351;&#38024;&#65289;</div>
<div class="t-li1"><span class="t-li">3)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">newoff <span class="sy2">+</span> off</span></span> &#20026;&#36127;&#25110;&#22312;&#32531;&#20914;&#21306;&#30340;&#24050;&#21021;&#22987;&#21270;&#37096;&#20998;&#22806;&#65292;&#21017;&#20989;&#25968;&#22833;&#36133;</div>
<div class="t-li1"><span class="t-li">4)</span> &#21542;&#21017;&#65292;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">gptr<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> eback<span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> newoff <span class="sy2">+</span> off</span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">pptr<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> pbase<span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> newoff <span class="sy2">+</span> off</span></span> &#36171;&#20540;&#25351;&#38024;&#12290;</div>
<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>&#35774;&#32622;&#65288;&#20004;&#20010;&#65289;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;&#21040;&#30340;&#30456;&#23545;&#20301;&#32622;</td>
</tr>
<tr class="t-par">
<td>way</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;&#24433;&#21709;&#36755;&#20837;&#24207;&#21015;&#12289;&#36755;&#20986;&#24207;&#21015;&#25110;&#20004;&#32773;&#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>&#25104;&#21151;&#26102;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">pos_type<span class="br0">(</span>newoff<span class="br0">)</span></span></span> &#65292;&#22833;&#36133;&#26102;&#25110;&#33509; pos_type &#26080;&#27861;&#34920;&#31034;&#32467;&#26524;&#27969;&#20301;&#32622;&#21017;&#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=".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;strstream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">char</span> a<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> <span class="st0">&quot;123&quot;</span><span class="sy4">;</span>
<a href="cpp-io-strstream.html"><span class="kw1755">std::<span class="me2">strstream</span></span></a> ss<span class="br0">(</span>a, sizeof a<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// in/out</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;put pos = &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">tellp</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot; get pos = &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">tellg</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="sy4">;</span>
<span class="co1">// &#32477;&#23545;&#23547;&#20301;&#20004;&#32773;&#30340;&#25351;&#38024;</span>
ss.<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">1</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="sy4">;</span> <span class="co1">// &#21069;&#31227;&#20004;&#32773;</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;put pos = &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">tellp</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot; get pos = &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">tellg</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="sy4">;</span>
<span class="co1">// &#23581;&#35797;&#20174;&#24403;&#21069;&#20301;&#32622;&#21069;&#31227;&#20108;&#20010;&#25351;&#38024; 1 &#23383;&#31526;</span>
<span class="kw1">if</span><span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span> <span class="sy1">==</span> ss.<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">1</span>, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1704">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">cur</span></span></a><span class="br0">)</span><span class="br0">)</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;moving both pointers from current position failed<span class="es1">\n</span>&quot;</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;put pos = &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">tellp</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot; get pos = &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">tellg</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="sy4">;</span>
<span class="co1">// &#21069;&#31227;&#20889;&#25351;&#38024; 1 &#23383;&#31526;&#65292;&#20294;&#19981;&#31227;&#21160;&#35835;&#25351;&#38024;</span>
<span class="co1">// can also be called as ss.seekp(1, std::ios_base::cur);</span>
ss.<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">1</span>, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1704">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">cur</span></span></a>, <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>
<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;put pos = &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">tellp</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot; get pos = &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">tellg</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="sy4">;</span>
ss <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;a&#39;</span><span class="sy4">;</span> <span class="co1">// &#20889;&#20837;&#25918;&#32622;&#20301;&#32622;</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;Wrote &#39;a&#39; at put position, the buffer is now: &#39;&quot;</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">write</span><span class="br0">(</span>a, sizeof a<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;&#39;<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="kw4">char</span> ch<span class="sy4">;</span>
ss <span class="sy1">&gt;&gt;</span> ch<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;reading at get position gives &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> ch <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;<span class="es1">\n</span>&quot;</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">put pos = 0 get pos = 0
put pos = 1 get pos = 1
moving both pointers from current position failed
put pos = 1 get pos = 1
put pos = 2 get pos = 1
Wrote &#39;a&#39; at put position, the buffer is now: &#39;12a&#39;
reading at get position gives &#39;2&#39;</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-pubseekpos.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>
</td>
<td>&#29992;&#32477;&#23545;&#23547;&#22336;&#37325;&#23450;&#20301;&#36755;&#20837;&#24207;&#21015;&#12289;&#36755;&#20986;&#24207;&#21015;&#25110;&#20004;&#32773;&#20013;&#30340;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;<br />
<span class="t-mark">(<code>std::basic_streambuf&lt;CharT,Traits&gt;</code> &#30340;&#34394;&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<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>seekoff</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34394;]</span></span></span></div>
</div>
</td>
<td>&#29992;&#30456;&#23545;&#23547;&#22336;&#37325;&#23450;&#20301;&#36755;&#20837;&#24207;&#21015;&#12289;&#36755;&#20986;&#24207;&#21015;&#25110;&#20004;&#32773;&#20013;&#30340;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;<br />
<span class="t-mark">(<code>std::basic_streambuf&lt;CharT,Traits&gt;</code> &#30340;&#34394;&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_stringbuf-seekoff.html"><span class="t-lines"><span>seekoff</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34394;]</span></span></span></div>
</div>
</td>
<td>&#29992;&#30456;&#23545;&#23547;&#22336;&#65292;&#37325;&#23450;&#20301;&#36755;&#20837;&#24207;&#21015;&#12289;&#36755;&#20986;&#24207;&#21015;&#25110;&#20004;&#32773;&#20013;&#30340;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;<br />
<span class="t-mark">(<code>std::basic_stringbuf&lt;CharT,Traits,Allocator&gt;</code> &#30340;&#34394;&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-io-basic_filebuf-seekoff.html"><span class="t-lines"><span>seekoff</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34394;]</span></span></span></div>
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<td>&#29992;&#30456;&#23545;&#23547;&#22336;&#37325;&#23547;&#20301;&#25991;&#20214;&#20301;&#32622;<br />
<span class="t-mark">(<code>std::basic_filebuf&lt;CharT,Traits&gt;</code> &#30340;&#34394;&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
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