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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>fwrite</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-c.html">c</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-cstdio.html">&lt;cstdio&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> fwrite<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span> buffer, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> 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>
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<p>&#20889; <code>count</code> &#20010;&#26469;&#33258;&#32473;&#23450;&#25968;&#32452; <code>buffer</code> &#30340;&#23545;&#35937;&#21040;&#36755;&#20986;&#27969;<code>stream</code>&#12290;&#22914;&#21516;&#36716;&#35793;&#27599;&#20010;&#23545;&#35937;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">char</span></span></span> &#25968;&#32452;&#65292;&#24182;&#23545;&#27599;&#20010;&#23545;&#35937;&#35843;&#29992; <code>size</code> &#27425; <span class="t-lc"><a href="cpp-io-c-fputc.html">std::fputc</a></span> &#20197;&#23558;&#37027;&#20123; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">char</span></span></span> &#25353;&#39034;&#24207;&#20889;&#20837; <code>stream</code> &#19968;&#33324;&#20889;&#20837;&#12290;&#25991;&#20214;&#20301;&#32622;&#25351;&#31034;&#22120;&#21069;&#36827;&#20889;&#20837;&#30340;&#23383;&#33410;&#25968;&#12290;</p>
<p>&#33509;&#23545;&#35937;&#19981;<a href="cpp-named_req-TriviallyCopyable.html"><span style="font-style:italic">&#21487;&#24179;&#20961;&#22797;&#21046;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(TriviallyCopyable)</span></a> &#65292;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
<p>&#33509;&#20986;&#29616;&#38169;&#35823;&#65292;&#21017;&#25991;&#20214;&#20301;&#32622;&#25351;&#31034;&#22120;&#30340;&#32467;&#26524;&#20540;&#19981;&#30830;&#23450;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>buffer</td>
<td>-</td>
<td>&#25351;&#21521;&#25968;&#32452;&#20013;&#35201;&#34987;&#20889;&#20837;&#30340;&#39318;&#20010;&#23545;&#35937;&#30340;&#25351;&#38024;</td>
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<td>size</td>
<td>-</td>
<td>&#27599;&#20010;&#23545;&#35937;&#30340;&#22823;&#23567;</td>
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<td>count</td>
<td>-</td>
<td>&#35201;&#34987;&#20889;&#20837;&#30340;&#23545;&#35937;&#25968;</td>
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<td>stream</td>
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<td>&#25351;&#21521;&#36755;&#20986;&#27969;&#30340;&#25351;&#38024;</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;&#20889;&#20837;&#30340;&#23545;&#35937;&#25968;&#65292;&#33509;&#38169;&#35823;&#21457;&#29983;&#21017;&#21487;&#33021;&#23567;&#20110; <code>count</code> &#12290;</p>
<p>&#33509; <code>size</code> &#25110; <code>count</code> &#20026;&#38646;&#65292;&#21017; <code>fwrite</code> &#36820;&#22238;&#38646;&#24182;&#19981;&#36827;&#34892;&#20854;&#20182;&#34892;&#21160;&#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>
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;cstdio&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="co2">#include &lt;array&gt;</span>
<span class="kw4">int</span> main <span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#20889;&#32531;&#20914;&#21306;&#21040;&#25991;&#20214;</span>
<span class="kw1">if</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> f1 <span class="sy1">=</span> <a href="cpp-io-c-fopen.html"><span class="kw1813">std::<span class="me2">fopen</span></span></a><span class="br0">(</span><span class="st0">&quot;file.bin&quot;</span>, <span class="st0">&quot;wb&quot;</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="nu0">3</span><span class="sy1">&gt;</span> v <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">42</span>, <span class="sy2">-</span><span class="nu0">1</span>, <span class="nu0">7</span><span class="br0">}</span><span class="sy4">;</span> <span class="co1">// std::array &#30340;&#24213;&#23618;&#23384;&#20648;&#20026;&#25968;&#32452;</span>
std<span class="sy4">::</span><span class="me2">fwrite</span><span class="br0">(</span>v.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span>, sizeof v<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>, v.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span>, f1<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-c-fclose.html"><span class="kw1816">std::<span class="me2">fclose</span></span></a><span class="br0">(</span>f1<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="co1">// &#35835;&#21462;&#21516;&#19968;&#25968;&#25454;&#24182;&#25171;&#21360;&#23427;&#21040;&#26631;&#20934;&#36755;&#20986;</span>
<span class="kw1">if</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>f2 <span class="sy1">=</span> <a href="cpp-io-c-fopen.html"><span class="kw1813">std::<span class="me2">fopen</span></span></a><span class="br0">(</span><span class="st0">&quot;file.bin&quot;</span>, <span class="st0">&quot;rb&quot;</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> rbuf<span class="br0">(</span><span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// std::vector &#30340;&#24213;&#23618;&#23384;&#20648;&#20134;&#20026;&#25968;&#32452;</span>
<a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> sz <span class="sy1">=</span> <a href="cpp-io-c-fread.html"><span class="kw1819">std::<span class="me2">fread</span></span></a><span class="br0">(</span>rbuf.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span>, sizeof rbuf<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>, rbuf.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span>, f2<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-c-fclose.html"><span class="kw1816">std::<span class="me2">fclose</span></span></a><span class="br0">(</span>f2<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> sz<span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-io-c-fprintf.html"><span class="kw1844">std::<span class="me2">printf</span></span></a><span class="br0">(</span><span class="st0">&quot;%d<span class="es1">\n</span>&quot;</span>, rbuf<span class="br0">[</span>n<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</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">42
-1
7</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-c-fprintf.html"><span class="t-lines"><span>printf</span><span>fprintf</span><span>sprintf</span><span>snprintf</span></span></a></div>
<div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#25171;&#21360;&#26377;&#26684;&#24335;&#36755;&#20986;&#21040; <span class="t-lc"><a href="cpp-io-c.html">stdout</a></span>&#12289;&#25991;&#20214;&#27969;&#25110;&#32531;&#20914;&#21306;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-io-c-fputs.html"><span class="t-lines"><span>fputs</span></span></a></div>
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<td>&#20889;&#23383;&#31526;&#20018;&#21040;&#25991;&#20214;&#27969;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-io-c-fread.html"><span class="t-lines"><span>fread</span></span></a></div>
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<td>&#20174;&#25991;&#20214;&#35835;&#21462;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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