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<title>echoclient.html Example File | Qt WebSockets 5.7</title>
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<td >Qt 5.7</td><td ><a href="qtwebsockets-index.html">Qt WebSockets</a></td><td ><a href="qtwebsockets-echoserver-example.html">Echo Server Example</a></td><td >echoclient.html Example File</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.7.1 Reference Documentation</td>
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<h1 class="title">echoclient.html Example File</h1>
<span class="subtitle">echoserver/echoclient.html</span>
<!-- $$$echoserver/echoclient.html-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<html>
<head>
<title>WebSocket Echo Client</title>
</head>
<body>
<h1>WebSocket Echo Client</h1>
<p>
<button onClick="initWebSocket();">Connect</button>
<button onClick="stopWebSocket();">Disconnect</button>
<button onClick="checkSocket();">State</button>
</p>
<p>
<textarea id="debugTextArea" style="width:400px;height:200px;"></textarea>
</p>
<p>
<input type="text" id="inputText" onkeydown="if(event.keyCode==13)sendMessage();"/>
<button onClick="sendMessage();">Send</button>
</p>
<script type="text/javascript">
var debugTextArea = document.getElementById("debugTextArea");
function debug(message) {
debugTextArea.value += message + "\n";
debugTextArea.scrollTop = debugTextArea.scrollHeight;
}
function sendMessage() {
var msg = document.getElementById("inputText").value;
if ( websocket != null )
{
document.getElementById("inputText").value = "";
websocket.send( msg );
console.log( "string sent :", '"'+msg+'"' );
}
}
var wsUri = "ws://localhost:1234";
var websocket = null;
function initWebSocket() {
try {
if (typeof MozWebSocket == 'function')
WebSocket = MozWebSocket;
if ( websocket && websocket.readyState == 1 )
websocket.close();
websocket = new WebSocket( wsUri );
websocket.onopen = function (evt) {
debug("CONNECTED");
};
websocket.onclose = function (evt) {
debug("DISCONNECTED");
};
websocket.onmessage = function (evt) {
console.log( "Message received :", evt.data );
debug( evt.data );
};
websocket.onerror = function (evt) {
debug('ERROR: ' + evt.data);
};
} catch (exception) {
debug('ERROR: ' + exception);
}
}
function stopWebSocket() {
if (websocket)
websocket.close();
}
function checkSocket() {
if (websocket != null) {
var stateStr;
switch (websocket.readyState) {
case 0: {
stateStr = "CONNECTING";
break;
}
case 1: {
stateStr = "OPEN";
break;
}
case 2: {
stateStr = "CLOSING";
break;
}
case 3: {
stateStr = "CLOSED";
break;
}
default: {
stateStr = "UNKNOW";
break;
}
}
debug("WebSocket state = " + websocket.readyState + " ( " + stateStr + " )");
} else {
debug("WebSocket is null");
}
}
</script>
</body>
</html>
</pre>
</div>
<!-- @@@echoserver/echoclient.html -->
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<acronym title="Copyright">©</acronym> 2016 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
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