1：要应用socket，首先得在 .prc 文件中增加：QT += network

2：#include <QtNetwork/QUdpSocket>

3：发送方，代码例如：connect(sendButton,SIGNAL(clicked()),this,SLOT(broadcastDatagram())); 

void broadcastDatagram() {

　QString temp="...................";

 

QByteArraydatagram;

 

datagram.append(temp);

 

udpSocket->writeDatagram(datagram,QHostAddress::Broadcast,45455);

 

}

4：接收方，代码例如：

　udpSocket=newQUdpSocket(this);

udpSocket->bind(45454,QUdpSocket::ShareAddress); connect(udpSocket,SIGNAL(readyRead()),this,SLOT(pendingDatagram()));

 

voidUser::pendingDatagram()

{

 

while(udpSocket->hasPendingDatagrams()){

 

　　QByteArray  datagram;

 

　　datagram.resize(udpSocket->pendingDatagramSize());

 

　　udpSocket->readDatagram(datagram.data(),datagram.size());

 

　　showTextBrowser->append(datagram.data()); }

 

} 这样就能够接收到信息了

5: 细节未完善