杂乱的UDPsocket

void UdpClient::dataReceived()
{
while(udpSocket->hasPendingDatagrams())
{
QByteArray datagram;
datagram.resize(udpSocket->pendingDatagramSize());

udpSocket->readDatagram(datagram.data(),datagram.size());
QString msg=datagram.data();
ReceiveTextEdit->insertPlainText(msg);
}
}

udpSocket = new QUdpSocket(this);
connect(udpSocket,SIGNAL(readyRead()),this,SLOT(dataReceived()));

bool result=udpSocket->bind(port);
if(!result)
{
QMessageBox::information(this,tr("error"),tr("udp socket create error!"));
return;
}
port =5555;

int port;
QUdpSocket *udpSocket;
udpSocket = new QUdpSocket(this);
if((length=udpSocket->writeDatagram(msg.toLatin1(),msg.length(),QHostAddress::Broadcast,port))!=msg.length())

直接发送和接收结构体，例如：
struct A {...};
struct A objectA;

发送的时候：
tcpSocket->write((char *)&objectA, sizeof(objectA));
接收的时候：
struct A objectB;
tcpSocket->read((char *)&objectA, sizeof(objectA));

udpSocket = new QUdpSocket(this);
QByteArray datagram = "blog.const.net.cn";
udpSocket->writeDatagram(datagram.data(), datagram.size(), QHostAddress::Broadcast, 45454);
udpSocket->bind(QHostAddress("192.168.1.104"), 45454);

UDP客户端广播
QUdpSocket *udpsocket1 = new QUdpSocket(this);
QByteArray datagram = "http://blog.const.net.cn";
udpsocket1->writeDatagram(datagram.data(),datagram.size(), QHostAddress::Broadcast,ui->spinBox->text().toInt());

UDP客户端发送到指定IP
QUdpSocket *udpsocket1 = new QUdpSocket(this);
QByteArray datagram = "http://blog.const.net.cn";
udpsocket1->writeDatagram(datagram.data(),datagram.size(),
QHostAddress("192.168.1.104"),ui->spinBox->text().toInt());

收数据
connect(udpsocket, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()));
while (udpsocket->hasPendingDatagrams())
{
QByteArray datagram;
datagram.resize(udpsocket->pendingDatagramSize());
QHostAddress sender;
quint16 senderPort;
udpsocket->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort);
qDebug()<<datagram.data()<<datagram.size()<<senderPort<<sender.toString(); //processTheDatagram(datagram);
}