klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
196e706fe41f737f31d8617ead8fe566aa616329
hustoj/web/cppreference-zh/chmhelp/cpp-io-c-fgets.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

153 lines
11 KiB
HTML
Raw 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::fgets</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_c_fgets 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::</span>fgets</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-c.html">c</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-dsc-header">
<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-cstdio.html">&lt;cstdio&gt;</a></code></div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span><span class="sy2">*</span> fgets<span class="br0">(</span> <span class="kw4">char</span><span class="sy2">*</span> str, <span class="kw4">int</span> count, <a href="cpp-io-c.html"><span class="kw1876">std::<span class="me2">FILE</span></span></a><span class="sy2">*</span> stream <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#20174;&#32473;&#23450;&#25991;&#20214;&#27969;&#35835;&#21462;&#26368;&#22810; <span class="t-c"><span class="mw-geshi cpp source-cpp">count <span class="sy2">-</span> <span class="nu0">1</span></span></span> &#20010;&#23383;&#31526;&#24182;&#23558;&#23427;&#20204;&#23384;&#20648;&#20110; <code>str</code> &#25152;&#25351;&#21521;&#30340;&#23383;&#31526;&#25968;&#32452;&#12290;&#33509;&#25991;&#20214;&#23614;&#20986;&#29616;&#25110;&#21457;&#29616;&#25442;&#34892;&#31526;&#21017;&#32456;&#27490;&#20998;&#26512;&#65292;&#21518;&#19968;&#24773;&#20917;&#19979; <code>str</code> &#23558;&#21253;&#21547;&#19968;&#20010;&#25442;&#34892;&#31526;&#12290;&#33509;&#35835;&#20837;&#23383;&#33410;&#19988;&#26080;&#38169;&#35823;&#21457;&#29983;&#65292;&#21017;&#32039;&#38543;&#20889;&#20837;&#21040; <code>str</code> &#30340;&#26368;&#21518;&#19968;&#20010;&#23383;&#31526;&#21518;&#20889;&#20837;&#31354;&#23383;&#31526;&#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>str</td>
<td>-</td>
<td>&#25351;&#21521; char &#25968;&#32452;&#20803;&#32032;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>count</td>
<td>-</td>
<td>&#35201;&#20889;&#20837;&#30340;&#26368;&#22823;&#23383;&#31526;&#25968;&#65288;&#20856;&#22411;&#22320;&#20026; <code>str</code> &#30340;&#38271;&#24230;&#65289;</td>
</tr>
<tr class="t-par">
<td>stream</td>
<td>-</td>
<td>&#35835;&#21462;&#25968;&#25454;&#26469;&#28304;&#30340;&#25991;&#20214;&#27969;</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; <code>str</code> &#65292;&#22833;&#36133;&#26102;&#20026;&#31354;&#25351;&#38024;&#12290;</p>
<p>&#33509;&#36935;&#21040;&#25991;&#20214;&#23614;&#26465;&#20214;&#23548;&#33268;&#20102;&#22833;&#36133;&#65292;&#21017;&#35774;&#32622; <code>stream</code> &#19978;&#30340;<i>&#25991;&#20214;&#23614;</i>&#25351;&#31034;&#22120;&#65288;&#35265; <span class="t-lc"><a href="cpp-io-c-feof.html">std::feof()</a></span> &#65289;&#12290;&#36825;&#20165;&#33509;&#23427;&#23548;&#33268;&#26410;&#35835;&#21462;&#23383;&#31526;&#25165;&#26159;&#22833;&#36133;&#65292;&#35813;&#24773;&#20917;&#19979;&#36820;&#22238;&#31354;&#25351;&#38024;&#19988;&#19981;&#25913;&#21464; <code>str</code> &#25152;&#25351;&#21521;&#25968;&#32452;&#30340;&#20869;&#23481;&#65288;&#21363;&#19981;&#20197;&#31354;&#23383;&#31526;&#35206;&#20889;&#39318;&#23383;&#33410;&#65289;&#12290;</p>
<p>&#33509;&#20854;&#20182;&#38169;&#35823;&#26465;&#20214;&#23548;&#33268;&#20102;&#22833;&#36133;&#65292;&#21017;&#35774;&#32622; <code>stream</code>&#19978;&#30340;<i>&#38169;&#35823;</i>&#25351;&#31034;&#22120;&#65288;&#35265; <span class="t-lc"><a href="cpp-io-c-ferror.html">std::ferror()</a></span> &#65289;&#12290; <code>str</code> &#25152;&#25351;&#21521;&#30340;&#25968;&#32452;&#20869;&#23481;&#26159;&#19981;&#30830;&#23450;&#30340;&#65288;&#29978;&#33267;&#21487;&#20197;&#19981;&#26159;&#31354;&#32456;&#27490;&#30340;&#65289;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p><a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/fgets.html">POSIX &#39069;&#22806;&#35201;&#27714;</a>&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">fgets</span></span> &#36935;&#21040;&#24322;&#20110;&#25991;&#20214;&#23614;&#26465;&#20214;&#30340;&#22833;&#36133;&#21017;&#35774;&#32622; <span class="t-lc"><a href="cpp-error-errno.html">errno</a></span> &#12290;</p>
<p>&#23613;&#31649;&#26631;&#20934;&#35268;&#33539;&#22312; <span class="t-c"><span class="mw-geshi cpp source-cpp">count<span class="sy1">&lt;=</span><span class="nu0">1</span></span></span> &#30340;&#24773;&#20917;&#19979;<a rel="nofollow" class="external text" href="https://stackoverflow.com/questions/23388620">&#19981;&#26126;</a>&#65292;&#24120;&#35265;&#30340;&#23454;&#29616;</p>
<ul>
<li>&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">count <span class="sy1">&lt;</span> <span class="nu0">1</span></span></span> &#21017;&#19981;&#20570;&#20219;&#20309;&#20107;&#24182;&#25253;&#21578;&#38169;&#35823;</li>
<li>&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">count <span class="sy1">==</span> <span class="nu0">1</span></span></span> &#65292;&#21017;</li>
</ul>
<dl>
<dd>
<ul>
<li>&#26576;&#20123;&#23454;&#29616;&#19981;&#20570;&#20219;&#20309;&#20107;&#24182;&#25253;&#21578;&#38169;&#35823;&#65292;</li>
<li>&#20854;&#20182;&#23454;&#29616;&#19981;&#35835;&#20869;&#23481;&#65292;&#23384;&#20648;&#38646;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">str<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span></span></span> &#24182;&#25253;&#21578;&#25104;&#21151;</li>
</ul>
</dd>
</dl>
<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;cstdio&gt;</span>
<span class="co2">#include &lt;cstdlib&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-c.html"><span class="kw1876">std::<span class="me2">FILE</span></span></a><span class="sy2">*</span> tmpf <span class="sy1">=</span> <a href="cpp-io-c-tmpfile.html"><span class="kw1874">std::<span class="me2">tmpfile</span></span></a><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-c-fputs.html"><span class="kw1825">std::<span class="me2">fputs</span></span></a><span class="br0">(</span><span class="st0">&quot;Alan Turing<span class="es1">\n</span>&quot;</span>, tmpf<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-c-fputs.html"><span class="kw1825">std::<span class="me2">fputs</span></span></a><span class="br0">(</span><span class="st0">&quot;John von Neumann<span class="es1">\n</span>&quot;</span>, tmpf<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-c-fputs.html"><span class="kw1825">std::<span class="me2">fputs</span></span></a><span class="br0">(</span><span class="st0">&quot;Alonzo Church<span class="es1">\n</span>&quot;</span>, tmpf<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-c-rewind.html"><span class="kw1868">std::<span class="me2">rewind</span></span></a><span class="br0">(</span>tmpf<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">char</span> buf<span class="br0">[</span><span class="nu0">8</span><span class="br0">]</span><span class="sy4">;</span>
<span class="kw1">while</span> <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">fgets</span><span class="br0">(</span>buf, sizeof buf, tmpf<span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> <a href="cpp-types-NULL.html"><span class="kw103">NULL</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">&#39;&quot;&#39;</span> <span class="sy1">&lt;&lt;</span> buf <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;&quot;&#39;</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>
<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">&quot;Alan Tu&quot;
&quot;ring
&quot;
&quot;John vo&quot;
&quot;n Neuma&quot;
&quot;nn
&quot;
&quot;Alonzo &quot;
&quot;Church
&quot;</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-c-fscanf.html"><span class="t-lines"><span>scanf</span><span>fscanf</span><span>sscanf</span></span></a></div>
</div>
</td>
<td>&#20174; <span class="t-lc"><a href="cpp-io-c.html">stdin</a></span>&#12289;&#25991;&#20214;&#27969;&#25110;&#32531;&#20914;&#21306;&#35835;&#21462;&#26377;&#26684;&#24335;&#36755;&#20837;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-c-gets.html"><span class="t-lines"><span>gets</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx11">(C++11 &#20013;&#24323;&#29992;)</span></span><span><span class="t-mark-rev t-until-cxx14">(C++14 &#20013;&#31227;&#38500;)</span></span></span></div>
</div>
</td>
<td>&#20174; <span class="t-lc"><a href="cpp-io-c.html">stdin</a></span> &#35835;&#21462;&#23383;&#31526;&#20018;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-c-fputs.html"><span class="t-lines"><span>fputs</span></span></a></div>
</div>
</td>
<td>&#20889;&#23383;&#31526;&#20018;&#21040;&#25991;&#20214;&#27969;<br />
<span class="t-mark">(&#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