QT UDP通信接受发送数据

首先在.pro文件中加入 QT +=network；

客户端

1.建立socket

sender = new QUdpSocket(this);

2.绑定端口

sender->bind(45453,QUdpSocket::ShareAddress);

3.接受数据

 connect(sender,SIGNAL(readyRead()),this,SLOT(processPendingDatagram())); 

void processPendingDatagram() //处理等待的数据报
{
    while(sender->hasPendingDatagrams()) //拥有等待的数据报
    {
        QByteArray datagram; //拥于存放接收的数据报
        datagram.resize(sender->pendingDatagramSize());
        sender->readDatagram(datagram.data(),datagram.size());
        unsigned short size = datagram.size();
        unsigned char msg[10] = {0};
        memcpy(msg, datagram.data(), size);
        unsigned short arr = msg[0];
        arr = (arr<<8)+msg[1];
        qDebug()<<msg[0]<<msg[1]<<msg[2]<<msg[3];
    }
}

4.发送数据

sender->writeDatagram((char*)msg,3, QHostAddress::Broadcast,45454);

服务端

1.建立Socket 

receiver = new QUdpSocket(this);

2.绑定端口

receiver->bind(45454,QUdpSocket::ShareAddress);

3.接受数据

    connect(receiver,SIGNAL(readyRead()),this,SLOT(processPendingDatagram()));

void processPendingDatagram() //处理等待的数据报
{
    while(receiver->hasPendingDatagrams()) //拥有等待的数据报
    {
        QByteArray datagram; //拥于存放接收的数据报
        datagram.resize(receiver->pendingDatagramSize());
        receiver->readDatagram(datagram.data(),datagram.size());
        unsigned short size = datagram.size();
        unsigned char msg[10] = {0};
        memcpy(msg, datagram.data(), size);

        qDebug()<<msg[0]<<msg[1]<<msg[2]<<msg[3];
    }
}

4.发送数据
   receiver->writeDatagram((char*)msg,3, QHostAddress::Broadcast,45453);