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<title>Qt 4.8: receiver.cpp Example File (network/multicastreceiver/receiver.cpp)</title>
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<h1 class="title">receiver.cpp Example File</h1>
<span class="small-subtitle">network/multicastreceiver/receiver.cpp</span>
<!-- $$$network/multicastreceiver/receiver.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
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****************************************************************************/</span>
<span class="preprocessor">#include <QtGui></span>
<span class="preprocessor">#include <QtNetwork></span>
<span class="preprocessor">#include "receiver.h"</span>
Receiver<span class="operator">::</span>Receiver(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qdialog.html">QDialog</a></span>(parent)
{
groupAddress <span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span>(<span class="string">"239.255.43.21"</span>);
statusLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Listening for multicasted messages"</span>));
quitButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">"&Quit"</span>));
udpSocket <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qudpsocket.html">QUdpSocket</a></span>(<span class="keyword">this</span>);
udpSocket<span class="operator">-</span><span class="operator">></span>bind(<span class="number">45454</span><span class="operator">,</span> <span class="type"><a href="qudpsocket.html">QUdpSocket</a></span><span class="operator">::</span>ShareAddress);
udpSocket<span class="operator">-</span><span class="operator">></span>joinMulticastGroup(groupAddress);
connect(udpSocket<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(processPendingDatagrams()));
connect(quitButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
<span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>buttonLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>;
buttonLayout<span class="operator">-</span><span class="operator">></span>addStretch(<span class="number">1</span>);
buttonLayout<span class="operator">-</span><span class="operator">></span>addWidget(quitButton);
buttonLayout<span class="operator">-</span><span class="operator">></span>addStretch(<span class="number">1</span>);
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(statusLabel);
mainLayout<span class="operator">-</span><span class="operator">></span>addLayout(buttonLayout);
setLayout(mainLayout);
setWindowTitle(tr(<span class="string">"Multicast Receiver"</span>));
}
<span class="type">void</span> Receiver<span class="operator">::</span>processPendingDatagrams()
{
<span class="keyword">while</span> (udpSocket<span class="operator">-</span><span class="operator">></span>hasPendingDatagrams()) {
<span class="type"><a href="qbytearray.html">QByteArray</a></span> datagram;
datagram<span class="operator">.</span>resize(udpSocket<span class="operator">-</span><span class="operator">></span>pendingDatagramSize());
udpSocket<span class="operator">-</span><span class="operator">></span>readDatagram(datagram<span class="operator">.</span>data()<span class="operator">,</span> datagram<span class="operator">.</span>size());
statusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Received datagram: \"%1\""</span>)
<span class="operator">.</span>arg(datagram<span class="operator">.</span>data()));
}
}</pre>
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<!-- @@@network/multicastreceiver/receiver.cpp -->
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