qt实现多线程udp通信

下面是一个简单的Qt程序，实现了多线程UDP通信：

#include <QtCore/QCoreApplication>
#include <QtCore/QThread>
#include <QtNetwork/QUdpSocket>
#include <QtNetwork/QHostAddress>

class UdpThread : public QThread
{
    Q_OBJECT
public:
    UdpThread(QObject* parent = nullptr) : QThread(parent) {}

signals:
    void messageReceived(const QByteArray& message);

protected:
    void run() override
    {
        QUdpSocket socket;
        socket.bind(QHostAddress::LocalHost, 12345);

        while (!isInterruptionRequested()) {
            QByteArray buffer;
            buffer.resize(socket.pendingDatagramSize());
            QHostAddress sender;
            quint16 senderPort;
            socket.readDatagram(buffer.data(), buffer.size(), &sender, &senderPort);
            emit messageReceived(buffer);
        }
    }
};

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

    UdpThread udpThread;
    QObject::connect(&udpThread, &UdpThread::messageReceived, [](const QByteArray& message){
        qDebug() << "Received message:" << message;
    });
    udpThread.start();

    QUdpSocket socket;
    socket.writeDatagram("Hello world!", QHostAddress::LocalHost, 12345);

    return a.exec();
}

#include "main.moc"

该程序创建了一个`UdpThread`类来执行UDP通信的接收操作，`messageReceived`信号用于将接收到的消息传递给主线程处理。在主线程中，我们连接了`messageReceived`信号，打印接收到的消息，并向本地主机的12345端口发送了一条消息。

需要注意的是，如果要在Qt中使用多线程，需要在某些类中使用`Q_OBJECT`宏，并在`main.cpp`文件中添加`#include "main.moc"`语句以自动生成moc文件。