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<td >Qt 5.7</td><td ><a href="qtwebsockets-index.html">Qt WebSockets</a></td><td >QWebSocket client example</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#description">Description</a></li>
<li class="level1"><a href="#code">Code</a></li>
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<h1 class="title">QWebSocket client example</h1>
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<h2 id="description">Description</h2>
<p>The EchoClient example implements a WebSocket client that sends a message to a WebSocket server and dumps the answer that it gets back. This example should ideally be used with the EchoServer example.</p>
<a name="code"></a>
<h2 id="code">Code</h2>
<p>We start by connecting to the `connected()` signal.</p>
<pre class="cpp">
EchoClient<span class="operator">::</span>EchoClient(<span class="keyword">const</span> <span class="type">QUrl</span> <span class="operator">&</span>url<span class="operator">,</span> bool debug<span class="operator">,</span> <span class="type">QObject</span> <span class="operator">*</span>parent) :
<span class="type">QObject</span>(parent)<span class="operator">,</span>
m_url(url)<span class="operator">,</span>
m_debug(debug)
{
<span class="keyword">if</span> (m_debug)
<a href="../qtcore/qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"WebSocket server:"</span> <span class="operator"><</span><span class="operator"><</span> url;
connect(<span class="operator">&</span>m_webSocket<span class="operator">,</span> <span class="operator">&</span><span class="type">QWebSocket</span><span class="operator">::</span>connected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>EchoClient<span class="operator">::</span>onConnected);
connect(<span class="operator">&</span>m_webSocket<span class="operator">,</span> <span class="operator">&</span><span class="type">QWebSocket</span><span class="operator">::</span>disconnected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>EchoClient<span class="operator">::</span>closed);
m_webSocket<span class="operator">.</span>open(<span class="type">QUrl</span>(url));
}
</pre>
<p>After the connection, we open the socket to the given <i>url</i>.</p>
<pre class="cpp">
<span class="type">void</span> EchoClient<span class="operator">::</span>onConnected()
{
<span class="keyword">if</span> (m_debug)
<a href="../qtcore/qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"WebSocket connected"</span>;
connect(<span class="operator">&</span>m_webSocket<span class="operator">,</span> <span class="operator">&</span><span class="type">QWebSocket</span><span class="operator">::</span>textMessageReceived<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>EchoClient<span class="operator">::</span>onTextMessageReceived);
m_webSocket<span class="operator">.</span>sendTextMessage(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"Hello, world!"</span>));
}
</pre>
<p>When the client is connected successfully, we connect to the `onTextMessageReceived()` signal, and send out "Hello, world!". If connected with the EchoServer, we will receive the same message back.</p>
<pre class="cpp">
<span class="type">void</span> EchoClient<span class="operator">::</span>onTextMessageReceived(<span class="type">QString</span> message)
{
<span class="keyword">if</span> (m_debug)
<a href="../qtcore/qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Message received:"</span> <span class="operator"><</span><span class="operator"><</span> message;
m_webSocket<span class="operator">.</span>close();
}
</pre>
<p>Whenever a message is received, we write it out.</p>
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