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Qt 5.3.2 Reference Documentation</li>
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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>Description</h2>
<p>The EchoClient example implements a <a href="qml-qt-websockets-websocket.html">WebSocket</a> client that sends a message to a <a href="qml-qt-websockets-websocket.html">WebSocket</a> 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>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"><a href="../qtcore/qurl.html">QUrl</a></span> <span class="operator">&amp;</span>url<span class="operator">,</span> <span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>parent) :
    <span class="type"><a href="../qtcore/qobject.html">QObject</a></span>(parent)<span class="operator">,</span>
    m_url(url)
{
    connect(<span class="operator">&amp;</span>m_webSocket<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qwebsocket.html">QWebSocket</a></span><span class="operator">::</span>connected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>EchoClient<span class="operator">::</span>onConnected);
    connect(<span class="operator">&amp;</span>m_webSocket<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qwebsocket.html">QWebSocket</a></span><span class="operator">::</span>disconnected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>EchoClient<span class="operator">::</span>closed);
    m_webSocket<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qurl.html">QUrl</a></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()
{
    <a href="../qtcore/qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;WebSocket connected&quot;</span>;
    connect(<span class="operator">&amp;</span>m_webSocket<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qwebsocket.html">QWebSocket</a></span><span class="operator">::</span>textMessageReceived<span class="operator">,</span>
            <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>EchoClient<span class="operator">::</span>onTextMessageReceived);
    m_webSocket<span class="operator">.</span>sendTextMessage(<span class="type">QStringLiteral</span>(<span class="string">&quot;Hello, world!&quot;</span>));
}</pre>
<p>When the client is connected successfully, we connect to the `onTextMessageReceived()` signal, and send out &quot;Hello, world!&quot;. 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"><a href="../qtcore/qstring.html">QString</a></span> message)
{
    <a href="../qtcore/qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Message received:&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</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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