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# sender.cpp Example File

network/multicastsender/sender.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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     #include <QtGui>
     #include <QtNetwork>

     #include "sender.h"

     Sender::Sender(QWidget *parent)
         : QDialog(parent)
     {
         groupAddress = QHostAddress("239.255.43.21");

         statusLabel = new QLabel(tr("Ready to multicast datagrams to group %1 on port 45454").arg(groupAddress.toString()));

         ttlLabel = new QLabel(tr("TTL for multicast datagrams:"));
         ttlSpinBox = new QSpinBox;
         ttlSpinBox->setRange(0, 255);

         QHBoxLayout *ttlLayout = new QHBoxLayout;
         ttlLayout->addWidget(ttlLabel);
         ttlLayout->addWidget(ttlSpinBox);

         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(ttlSpinBox, SIGNAL(valueChanged(int)), this, SLOT(ttlChanged(int)));
         connect(startButton, SIGNAL(clicked()), this, SLOT(startSending()));
         connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
         connect(timer, SIGNAL(timeout()), this, SLOT(sendDatagram()));

         QVBoxLayout *mainLayout = new QVBoxLayout;
         mainLayout->addWidget(statusLabel);
         mainLayout->addLayout(ttlLayout);
         mainLayout->addWidget(buttonBox);
         setLayout(mainLayout);

         setWindowTitle(tr("Multicast Sender"));
         ttlSpinBox->setValue(1);
     }

     void Sender::ttlChanged(int newTtl)
     {
         udpSocket->setSocketOption(QAbstractSocket::MulticastTtlOption, newTtl);
     }

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

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