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‎reference/cstdlib.html

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最終更新日時(UTC):
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<td><code>system</code></td>
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<td><code><a href="cstdlib/system.html">system</a></code></td>
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<td>システムコマンドを実行する (function)</td>
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‎reference/cstdlib/system.html

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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="header">&lt;cstdlib&gt;</div><h1 itemprop="name"><span class="token">system</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="kt">int</span> <span class="nf">system</span><span class="p">(</span> <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">command</span> <span class="p">);</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p>ホスト環境のコマンド呼び出す。(e.g. <code>/bin/sh</code>, <code>cmd.exe</code>)</p>
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<p>基本の返り値はコマンドの実行結果。</p>
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<p>コマンドがヌルポインタの場合、ホスト環境にコマンドプロセッサが存在するか確認し、存在している場合のみに非ゼロ値を返す。</p>
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<h2>注釈</h2>
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<p>POSIXでは<code>WEXITSTATUS</code>と<code>WSTOPSIG</code>を使用、分解できる</p>
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<p>生成されるプロセスが画面の入出力を伴う場合、<code>std::system</code>を呼び出す前に、<code>std::cout</code>の明示的なフラッシュが必要になる場合がある。</p>
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<h2>例</h2>
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<p><div class="yata" id="5ceb0964e5c0e9bc548c28c8a418094a95bebeec"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../cstdlib.html">&lt;cstdlib&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../fstream.html">&lt;fstream&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="n">std</span><span class="o">::</span><span class="n">system</span><span class="p">(</span><span class="s">"ls -l &gt;test.txt"</span><span class="p">);</span><span class="c1">//"ls -l &gt;test.txt"を実行</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">ifstream</span><span class="p">(</span><span class="s">"test.txt"</span><span class="p">).</span><span class="n">rdbuf</span><span class="p">();</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h2>出力結果</h2>
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<p><pre><code>total 16
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-rwxr-xr-x 1 2001 2000 8859 Sep 30 20:52 a.out
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-rw-rw-rw- 1 2001 2000 161 Sep 30 20:52 main.cpp
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-rw-r--r-- 1 2001 2000 0 Sep 30 20:52 test.txt
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</code></pre></p>
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<h2>関連項目</h2>
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<table border="1" bordercolor="#888" style="border-collapse:collapse">
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<thead>
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<tr>
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<th>名前</th>
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<th>説明</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code><a href="../ostream/flush.html">flush</a></code></td>
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<td>バッファをフラッシュする</td>
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</tr>
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/cstdlib">WEXITSTATUS</span></code></td>
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<td>子プロセスが正常に終了した場合、非ゼロ値を返す</td>
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</tr>
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/cstdlib">WSTOPSIG</span></code></td>
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<td>子プロセスを停止したシグナル数を評価する</td>
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</tr>
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</tbody>
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