QT多线程网络通信代码

以下是一个使用Qt多线程进行网络通信的简单示例代码：

#include <QtNetwork>
#include <QThread>

class NetworkThread : public QThread
{
    Q_OBJECT

public:
    NetworkThread(QObject *parent = nullptr)
        : QThread(parent)
    {
        // 初始化网络套接字
        m_socket = new QTcpSocket(this);
        connect(m_socket, &QTcpSocket::readyRead, this, &NetworkThread::onReadyRead);
        connect(m_socket, &QTcpSocket::disconnected, this, &NetworkThread::onDisconnected);
    }

    void connectToHost(const QString &host, quint16 port)
    {
        m_socket->connectToHost(host, port);
    }

    void disconnectFromHost()
    {
        m_socket->disconnectFromHost();
    }

    void sendData(const QByteArray &data)
    {
        m_socket->write(data);
    }

signals:
    void receivedData(const QByteArray &data);
    void disconnected();

protected:
    void run() override
    {
        exec();
    }

private slots:
    void onReadyRead()
    {
        QByteArray data = m_socket->readAll();
        emit receivedData(data);
    }

    void onDisconnected()
    {
        emit disconnected();
    }

private:
    QTcpSocket *m_socket;
};

int main()
{
    NetworkThread networkThread;
    networkThread.connectToHost("localhost", 1234);

    // 启动网络线程
    networkThread.start();

    // 发送数据
    QByteArray data("Hello, World!");
    networkThread.sendData(data);

    // 停止网络线程
    networkThread.disconnectFromHost();
    networkThread.quit();
    networkThread.wait();

    return 0;
}

该示例中创建了一个继承自QThread的NetworkThread类，用于在后台线程中执行网络通信操作。该类中包含了一个QTcpSocket成员变量，用于与远程主机建立连接，并进行数据传输。

在main函数中，先创建了一个NetworkThread对象，并调用其connectToHost函数连接到远程主机。然后调用start函数启动该线程，在后台线程中发送数据，最后通过disconnectFromHost、quit和wait函数停止该线程。