sender.cpp 范例文件

multicastsender/sender.cpp
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#include <QtWidgets> #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; }