Qt UDP 通信实现

UDP通信的原理不在累述，主要谈Qt UDP通信的实现。

1. pro文件中加入编译条件。

QT       += network

2. 构造函数完成UDP scoket的是初始话实现如下。

udpSocet::udpSocet(const uint16_t port)
{
    QString localHostName = QHostInfo::localHostName();  //获取本机IP
    udpSocket = new QUdpSocket();
    udpSocket->bind(QHostAddress(localHostName), port);
    connect(udpSocket,SIGNAL(readyRead()),this,SLOT(recvMsgSlots()));
    qDebug() << "--- udpSocket Init ---" ;
}

 3. 槽函数具体实现，数据被存储在QByteArray中，通过信号与供其他类调用

void udpSocet::recvMsgSlots(void)
{
    QByteArray msg;
    while(udpSocket->hasPendingDatagrams())
    {
        msg.resize(int(udpSocket->pendingDatagramSize()));
        udpSocket->readDatagram(msg.data(), msg.size());    
        qDebug() << "UDP Receive:" << msg.size();
        qDebug() << "UDP Receive:" << msg.data();
        emit receiveSignals(msg);   //产生数据接收信号
    }
}

4. 数据调用

    udpSocet *udp = new udpSocet(this);
    connect(udp,SIGNAL(receiveSignals(QByteArray)),this,SLOT(recSlots(QByteArray)));

void MainWindow::recSlots(QByteArray msg)
{
    qDebug() << "signal Receive:" << msg.size();
    qDebug() << "signal Receive:" << msg.data();
}

5. 获取发送方的IP和端口号

void udpSocet::recvMsgSlots(void)
{
    QByteArray msg;

    while(udpSocket->hasPendingDatagrams())
    {
        msg.resize(int(udpSocket->pendingDatagramSize()));
        udpSocket->readDatagram(msg.data(), msg.size(),recAddr,recPort);
        qDebug() << "UDP Receive IP:" << *recAddr << "PORT:" << *recPort;
        qDebug() << "UDP Receive SIZE:" << msg.size();
        qDebug() << "UDP Receive DATA:" << msg.data();
        emit receiveSignals(msg);   //产生数据接收信号
    }
}

6. 测试结果