broadcastsender 例字学习qt 广播 GIS

广播发送者

1 udpSocket = new QUdpSocket(this);

2 

QByteArray datagram = "Broadcast message " + QByteArray::number(messageNo);
udpSocket->writeDatagram(datagram.data(), datagram.size(),QHostAddress::Broadcast, 45454);
//! [1]
++messageNo;

广播接收者

1

udpSocket = new QUdpSocket(this);
udpSocket->bind(45454, QUdpSocket::ShareAddress);

connect(udpSocket, SIGNAL(readyRead()),this, SLOT(processPendingDatagrams()));

2  

void Receiver::processPendingDatagrams()
{
//! [2]
while (udpSocket->hasPendingDatagrams()) {
QByteArray datagram;
datagram.resize(udpSocket->pendingDatagramSize());
udpSocket->readDatagram(datagram.data(), datagram.size());
statusLabel->setText(tr("Received datagram: \"%1\"")
.arg(datagram.data()));
}
//! [2]
}