klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
master
hustoj/web/cppreference-zh/chmhelp/cpp-io-basic_ostream-seekp.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

170 lines
11 KiB
HTML
Raw Permalink Blame History

<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>std::basic_ostream&lt;CharT,Traits&gt;::seekp</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_ostream_seekp skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_ostream&lt;CharT,Traits&gt;::</span>seekp</h1>
<div id="bodyContent">
<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_ostream.html">basic ostream</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody>
<tr class="t-dcl">
<td>
<div><span class="mw-geshi cpp source-cpp">basic_ostream<span class="sy3">&amp;</span> seekp<span class="br0">(</span> pos_type pos <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(1)</td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td>
<div><span class="mw-geshi cpp source-cpp">basic_ostream<span class="sy3">&amp;</span> seekp<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>
</td>
<td>(2)</td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#35774;&#32622;&#24403;&#21069;&#20851;&#32852; <code>streambuf</code> &#23545;&#35937;&#30340;&#36755;&#20986;&#20301;&#32622;&#25351;&#31034;&#22120;&#12290;</p>
<table class="t-rev-begin">
<tr class="t-rev t-since-cxx11">
<td>
<p>&#34920;&#29616;&#20026;<a href="cpp-named_req-UnformattedOutputFunction.html"><span style="font-style:italic">&#26080;&#26684;&#24335;&#36755;&#20986;&#20989;&#25968;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(UnformattedOutputFunction)</span></a> &#65288;&#38500;&#20102;&#19981;&#23454;&#38469;&#36827;&#34892;&#36755;&#20986;&#65289;&#12290;&#22312;&#26500;&#36896;&#24182;&#26816;&#26597; sentry &#23545;&#35937;&#21518;&#65292;</p>
</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
</table>
<div class="t-li1"><span class="t-li">1)</span> &#36890;&#36807;&#35843;&#29992; <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="kw1675">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">out</span></span></a><span class="br0">)</span></span></span> &#65292;&#35774;&#32622;&#36755;&#20986;&#20301;&#32622;&#25351;&#31034;&#22120;&#20026;&#32477;&#23545;&#65288;&#30456;&#23545;&#20110;&#25991;&#20214;&#36215;&#22987;&#65289;&#20540; <code>pos</code> &#12290;&#33509;&#35843;&#29992;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>pos_type<span class="br0">)</span><span class="sy2">-</span><span class="nu0">1</span></span></span> &#65292;&#21017;&#25191;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp">setstate<span class="br0">(</span>failbit<span class="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#36890;&#36807;&#35843;&#29992; <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="kw1675">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">out</span></span></a><span class="br0">)</span></span></span> &#35774;&#32622;&#36755;&#20986;&#20301;&#32622;&#25351;&#31034;&#22120;&#20026;&#30456;&#23545;&#20110; <code>dir</code> &#30340;&#20559;&#31227; <code>off</code> &#12290;&#33509;&#35843;&#29992;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>pos_type<span class="br0">)</span><span class="sy2">-</span><span class="nu0">1</span></span></span> &#65292;&#21017;&#25191;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp">setstate<span class="br0">(</span>failbit<span class="br0">)</span></span></span> &#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>pos</td>
<td>-</td>
<td>&#35201;&#35774;&#32622;&#36755;&#20986;&#20301;&#32622;&#25351;&#31034;&#22120;&#21040;&#30340;&#32477;&#23545;&#20301;&#32622;&#12290;</td>
</tr>
<tr class="t-par">
<td>off</td>
<td>-</td>
<td>&#35201;&#35774;&#32622;&#36755;&#20986;&#20301;&#32622;&#25351;&#31034;&#22120;&#21040;&#30340;&#30456;&#23545;&#20301;&#32622;&#65288;&#27491;&#25110;&#36127;&#65289;&#12290;</td>
</tr>
<tr class="t-par">
<td>dir</td>
<td>-</td>
<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;
<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>
</table>
<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>
<div class="t-li1"><span class="t-li">1-2)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">exceptions<span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> failbit <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">0</span></span></span> &#65292;&#21017;&#22833;&#36133;&#24773;&#20917;&#19979;&#21487;&#20197;&#25243;&#20986; <span class="t-lc"><a href="cpp-io-ios_base-failure.html">std::ios_base::failure</a></span> &#12290;</div>
<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;sstream&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-basic_ostringstream.html"><span class="kw1736">std::<span class="me2">ostringstream</span></span></a> os<span class="br0">(</span><span class="st0">&quot;hello, world&quot;</span><span class="br0">)</span><span class="sy4">;</span>
os.<span class="me1">seekp</span><span class="br0">(</span><span class="nu0">7</span><span class="br0">)</span><span class="sy4">;</span>
os <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;W&#39;</span><span class="sy4">;</span>
os.<span class="me1">seekp</span><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="sy4">;</span>
os <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;!&#39;</span><span class="sy4">;</span>
os.<span class="me1">seekp</span><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
os <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;H&#39;</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> os.<span class="me1">str</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="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">Hello, World!</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2341">LWG 2341</a></td>
<td>C++98</td>
<td>&#20108;&#20010;&#37325;&#36733;&#22312;&#22833;&#36133;&#26102;&#34920;&#29616;&#26377;&#21035;</td>
<td>&#20351;&#20043;&#19968;&#33268;</td>
</tr>
</table>
<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_ostream-tellp.html"><span class="t-lines"><span>tellp</span></span></a></div>
</div>
</td>
<td>&#36820;&#22238;&#36755;&#20986;&#20301;&#32622;&#25351;&#31034;&#22120;<br />
<span class="t-mark">(&#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_istream-tellg.html"><span class="t-lines"><span>tellg</span></span></a></div>
</div>
</td>
<td>&#36820;&#22238;&#36755;&#20837;&#20301;&#32622;&#25351;&#31034;&#22120;<br />
<span class="t-mark">(<code>std::basic_istream&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_istream-seekg.html"><span class="t-lines"><span>seekg</span></span></a></div>
</div>
</td>
<td>&#35774;&#32622;&#36755;&#20837;&#20301;&#32622;&#25351;&#31034;&#22120;<br />
<span class="t-mark">(<code>std::basic_istream&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink