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<pre> /****************************************************************************
 **
 ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
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 ** This file is part of the example classes of the Qt Toolkit.
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 #include &lt;QtGui&gt;
 #include &lt;QtNetwork&gt;

 #include &quot;sender.h&quot;

 Sender::Sender(QWidget *parent)
     : QDialog(parent)
 {
     statusLabel = new QLabel(tr(&quot;Ready to broadcast datagrams on port 45454&quot;));

     startButton = new QPushButton(tr(&quot;&amp;Start&quot;));
     quitButton = new QPushButton(tr(&quot;&amp;Quit&quot;));

     buttonBox = new QDialogButtonBox;
     buttonBox-&gt;addButton(startButton, QDialogButtonBox::ActionRole);
     buttonBox-&gt;addButton(quitButton, QDialogButtonBox::RejectRole);

     timer = new QTimer(this);
     udpSocket = new QUdpSocket(this);
     messageNo = 1;

     connect(startButton, SIGNAL(clicked()), this, SLOT(startBroadcasting()));
     connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
     connect(timer, SIGNAL(timeout()), this, SLOT(broadcastDatagram()));

     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout-&gt;addWidget(statusLabel);
     mainLayout-&gt;addWidget(buttonBox);
     setLayout(mainLayout);

     setWindowTitle(tr(&quot;Broadcast Sender&quot;));
 }

 void Sender::startBroadcasting()
 {
     startButton-&gt;setEnabled(false);
     timer-&gt;start(1000);
 }

 void Sender::broadcastDatagram()
 {
     statusLabel-&gt;setText(tr(&quot;Now broadcasting datagram %1&quot;).arg(messageNo));
     QByteArray datagram = &quot;Broadcast message &quot; + QByteArray::number(messageNo);
     udpSocket-&gt;writeDatagram(datagram.data(), datagram.size(),
                              QHostAddress::Broadcast, 45454);
     ++messageNo;
 }</pre>
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