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hustoj/web/cppreference-zh/chmhelp/c-io-fgets.html
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<h1 id="firstHeading" class="firstHeading">fgets</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-io.html">io</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;stdio.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="kw4">char</span> <span class="sy2">*</span>fgets<span class="br0">(</span> <span class="kw4">char</span> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="sy2">*</span>str, <span class="kw4">int</span> count, <a href="c-io.html"><span class="kw883">FILE</span></a> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="sy2">*</span>stream <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-c99">(C99 &#21069;)</span></td>
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<div><span class="mw-geshi c source-c"><span class="kw4">char</span> <span class="sy2">*</span>fgets<span class="br0">(</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> str, <span class="kw4">int</span> count, <a href="c-io.html"><span class="kw883">FILE</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> stream <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<p>&#20174;&#32473;&#23450;&#25991;&#20214;&#27969;&#35835;&#21462;&#26368;&#22810; <span class="t-c"><span class="mw-geshi c source-c">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>
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<td>str</td>
<td>-</td>
<td>&#25351;&#21521; char &#25968;&#32452;&#20803;&#32032;&#30340;&#25351;&#38024;</td>
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<tr class="t-par">
<td>count</td>
<td>-</td>
<td>&#20889;&#20837;&#30340;&#26368;&#22823;&#23383;&#31526;&#25968;&#65288;&#20856;&#22411;&#30340;&#20026; <code>str</code> &#30340;&#38271;&#24230;&#65289;</td>
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<td>stream</td>
<td>-</td>
<td>&#35835;&#21462;&#25968;&#25454;&#26469;&#28304;&#30340;&#25991;&#20214;&#27969;</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>&#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="c-io-feof.html">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;&#26576;&#20123;&#20854;&#20182;&#38169;&#35823;&#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="c-io-ferror.html">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;&#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 c source-c">fgets</span></span> &#36935;&#21040;&#24322;&#20110;&#25991;&#20214;&#23614;&#26465;&#20214;&#30340;&#22833;&#36133;&#21017;&#35774;&#32622; <span class="t-lc"><a href="c-error-errno.html">errno</a></span> &#12290;</p>
<p>&#23613;&#31649;&#26631;&#20934;&#35268;&#33539;&#22312; <span class="t-c"><span class="mw-geshi c source-c">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 c source-c">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 c source-c">count <span class="sy1">==</span> <span class="nu0">1</span></span></span> &#65292;&#21017;</li>
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<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 c source-c">str<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span></span></span> &#24182;&#25253;&#21578;&#25104;&#21151;</li>
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<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="c source-c">
<pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;stdlib.h&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="c-io.html"><span class="kw883">FILE</span></a><span class="sy2">*</span> tmpf <span class="sy1">=</span> <a href="c-io-tmpfile.html"><span class="kw881">tmpfile</span></a><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fputs.html"><span class="kw831">fputs</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="c-io-fputs.html"><span class="kw831">fputs</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="c-io-fputs.html"><span class="kw831">fputs</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="c-io-rewind.html"><span class="kw874">rewind</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>fgets<span class="br0">(</span>buf, <span class="kw4">sizeof</span> buf, tmpf<span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> <a href="c-types-NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;<span class="es1">\&quot;</span>%s<span class="es1">\&quot;</span><span class="es1">\n</span>&quot;</span>, buf<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span><a href="c-io-feof.html"><span class="kw876">feof</span></a><span class="br0">(</span>tmpf<span class="br0">)</span><span class="br0">)</span>
<a href="c-io-puts.html"><span class="kw835">puts</span></a><span class="br0">(</span><span class="st0">&quot;End of file reached&quot;</span><span class="br0">)</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">&quot;Alan Tu&quot;
&quot;ring
&quot;
&quot;John vo&quot;
&quot;n Neuma&quot;
&quot;nn
&quot;
&quot;Alonzo &quot;
&quot;Church
&quot;
End of file reached</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-11">
<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.21.7.2 The fgets function (p: 331)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.19.7.2 The fgets function (p: 296)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c89">
<ul>
<li>C89/C90 &#26631;&#20934;&#65288;ISO/IEC 9899:1990&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>4.9.7.2 The fgets function</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="c-io-fscanf.html"><span class="t-lines"><span>scanf</span><span>fscanf</span><span>sscanf</span><span>scanf_s</span><span>fscanf_s</span><span>sscanf_s</span></span></a></div>
<div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
</div>
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<td>&#20174;<span class="t-lc"><a href="c-io.html">stdin</a></span>&#12289;&#25991;&#20214;&#27969;&#25110;&#32531;&#20914;&#21306;&#35835;&#21462;&#26684;&#24335;&#21270;&#36755;&#20837;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-io-gets.html"><span class="t-lines"><span>gets</span><span>gets_s</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-until-c11">(C11 &#20013;&#31227;&#38500;)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
</div>
</td>
<td>&#20174; <code>stdin</code> &#35835;&#21462;&#19968;&#20010;&#23383;&#31526;&#20018;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
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<div class="t-dsc-member-div">
<div><a href="c-io-fputs.html"><span class="t-lines"><span>fputs</span></span></a></div>
</div>
</td>
<td>&#23558;&#19968;&#20010;&#23383;&#31526;&#20018;&#20889;&#20837;&#25991;&#20214;&#27969;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-experimental-dynamic-getline.html"><span class="t-lines"><span>getline</span><span>getwline</span><span>getdelim</span><span>getwdelim</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-dynamic-tr t-mark-ts">(&#21160;&#24577;&#20869;&#23384; TR)</span></span></span></div>
</div>
</td>
<td>&#20174;&#27969;&#35835;&#20837;&#33267;&#21160;&#24577;&#25913;&#21464;&#22823;&#23567;&#30340;&#32531;&#20914;&#21306;&#65292;&#30452;&#21040;&#20998;&#38548;&#31526;/&#34892;&#23614;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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</table>
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</div>
<div class="visualClear"></div>
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