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    41 

    42 #include <QtGui>

    43 #include <QtNetwork>

    44 

    45 #include "sender.h"

    46 

    47 Sender::Sender(QWidget *parent)

    48     : QDialog(parent)

    49 {

    50     statusLabel = new QLabel(tr("Ready to broadcast datagrams on port 45454"));

    51 

    52     startButton = new QPushButton(tr("&Start"));

    53     quitButton = new QPushButton(tr("&Quit"));

    54 

    55     buttonBox = new QDialogButtonBox;

    56     buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);

    57     buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

    58 

    59     timer = new QTimer(this);

    60 //! [0]

    61     udpSocket = new QUdpSocket(this);

    62 //! [0]

    63     messageNo = 1;

    64 

    65     connect(startButton, SIGNAL(clicked()), this, SLOT(startBroadcasting()));

    66     connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

    67     connect(timer, SIGNAL(timeout()), this, SLOT(broadcastDatagram()));

    68 

    69     QVBoxLayout *mainLayout = new QVBoxLayout;

    70     mainLayout->addWidget(statusLabel);

    71     mainLayout->addWidget(buttonBox);

    72     setLayout(mainLayout);

    73 

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

    75 }

    76 

    77 void Sender::startBroadcasting()

    78 {

    79     startButton->setEnabled(false);

    80     timer->start(1000);

    81 }

    82 

    83 void Sender::broadcastDatagram()

    84 {

    85     statusLabel->setText(tr("Now broadcasting datagram %1").arg(messageNo));

    86 //! [1]

    87     QByteArray datagram = "Broadcast message " + QByteArray::number(messageNo);

    88     udpSocket->writeDatagram(datagram.data(), datagram.size(),

    89                              QHostAddress::Broadcast, 45454);

    90 //! [1]

    91     ++messageNo;

    92 }