sender.cpp Example File

broadcastsender/sender.cpp
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 #include <QtWidgets>
 #include <QtNetwork>
 #include <QtCore>

 #include "sender.h"

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

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

     auto buttonBox = new QDialogButtonBox;
     buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);
     buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

     udpSocket = new QUdpSocket(this);

     connect(startButton, &QPushButton::clicked, this, &Sender::startBroadcasting);
     connect(quitButton, &QPushButton::clicked, this, &Sender::close);
     connect(&timer, &QTimer::timeout, this, &Sender::broadcastDatagram);

     auto 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, QHostAddress::Broadcast, 45454);
     ++messageNo;
 }