给我些一个基于qt的udp组播的

示例代码。可以，以下是给您提供的基于QT的UDP组播示例代码：

#include <QtNetwork/QUdpSocket>

// 定义组播地址和端口号
QHostAddress groupAddress("224.1.1.1");
quint16 groupPort = 8000;

// 创建UDP套接字
QUdpSocket *udpSocket = new QUdpSocket(this);

// 加入组播
udpSocket->bind(QHostAddress::AnyIPv4, groupPort, QUdpSocket::ShareAddress);
udpSocket->joinMulticastGroup(groupAddress);

// 发送组播消息
QByteArray message = "Hello, multicast!";
udpSocket->writeDatagram(message.data(), message.size(), groupAddress, groupPort);

// 接收组播消息
connect(udpSocket, &QUdpSocket::readyRead, this, [=]() {
    while (udpSocket->hasPendingDatagrams()) {
        QByteArray datagram;
        datagram.resize(udpSocket->pendingDatagramSize());
        udpSocket->readDatagram(datagram.data(), datagram.size());

        qDebug() << "Received multicast message:" << datagram;
    }
});