Qt udp 点对点通信demo

以下是使用Qt实现UDP点对点通信的示例代码：

Sender端代码：

#include <QtNetwork/QUdpSocket>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QUdpSocket socket;
    // 绑定socket到本地地址和端口
    socket.bind(QHostAddress::AnyIPv4, 8888);

    // 发送UDP数据报
    QByteArray datagram = "hello world";
    QHostAddress receiverAddress("127.0.0.1");
    quint16 receiverPort = 9999;
    socket.writeDatagram(datagram, receiverAddress, receiverPort);

    return a.exec();
}

Receiver端代码：

#include <QtNetwork/QUdpSocket>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QUdpSocket socket;
    // 绑定socket到本地地址和端口
    socket.bind(QHostAddress::AnyIPv4, 9999);

    // 接收UDP数据报
    while (true) {
        QByteArray datagram;
        QHostAddress sender;
        quint16 senderPort;
        socket.waitForReadyRead(-1);
        datagram.resize(socket.pendingDatagramSize());
        socket.readDatagram(datagram.data(), datagram.size(), &sender, &senderPort);
        qDebug() << "Received datagram from" << sender.toString() << ":" << senderPort << datagram;
    }

    return a.exec();
}

在这个示例中，Sender端将UDP数据报发送到Receiver端的IP地址和端口号，Receiver端通过等待socket的数据可读信号和调用`readDatagram()`函数来接收数据报，并打印出发送数据报的主机地址、端口号和数据内容。

需要注意的是，在本示例中，Receiver端的端口号为9999，Sender端的端口号为8888，需要根据实际情况进行调整，确保Receiver端绑定的地址和端口与Sender端发送的地址和端口一致。