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# sender.cpp Example File
network/broadcastsender/sender.cpp

     /****************************************************************************
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     ** Copyright (C) 2004-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of
     ** this file.  Please review the following information to ensure GNU
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     #include <QtGui>
     #include <QtNetwork>

     #include "sender.h"

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

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

         buttonBox = new QDialogButtonBox;
         buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);
         buttonBox->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->addWidget(statusLabel);
         mainLayout->addWidget(buttonBox);
         setLayout(mainLayout);

         setWindowTitle(tr("Broadcast Sender"));
     }

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

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