简单的介绍使用QUdpSocket进行收发报文的用法:
发送方:
1.在Pro中添加QT += network
2.在头文件中添加:
class QUdpSocket;
private:
QUdpSocket *senders;
3.在 c文件的构造函数中添加对象的初始化:
senders = new QUdpSocket(this);
4.在ui文件中添加一个button并转到槽:
void sender::on_pushButton_clicked()
{
QByteArray datagram = "hello word!";
senders->writeDatagram(datagram.data(), datagram.size(), QHostAddress::Broadcast,45454);
}
发送方逐步完成,只要点击按钮就会发送广播信息。
接收方:
1.在Pro中添加QT += network
2.在头文件中添加:
class QUdpSocket;
private slots:
void processPendingDatagram();
QUdpSocket *receiver;
在c文件的构造函数中添加:
receiver = new QUdpSocket(this);
receiver->bind(45454,QUdpSocket::ShareAddress);
connect(receiver,SIGNAL(readyRead()), this,SLOT(processPendingDatagram()));
void Recevier :: processPendingDatagram()
{
while(receiver->hasPendingDatagrams())
{
QByteArray datagram;
datagram.resize(receiver->pendingDatagramSize());
receiver->readDatagram(datagram.data(),datagram.size());
ui->label->setText(datagram);
}
}
注意:
一开始的时候使用connect函数:
connect(receiver,&QUdpSocket::readyRead, this,&Receiver::processPendingDatagram);
在QT creator 4上变异没有问题,但是一旦一直到QT5上就会报:
'receiver' is not a class or namespace
connect(receiver, &QUdpSocket::readyRead, this,&receiver::processPendingDatagram);
不得已在QT5上修改成SIGNAl以及SLOT的形式。能够编译成功。