QT中解决QSocketNotifier: socket notifiers cannot be enabled from another thread错误

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class UDPReceive : public QThread{    Q_OBJECTpublic:    UDPReceive();    UDPReceive(QUdpSocket *s);protected:    virtual void run();private:    QUdpSocket *udp_socket;  };UDPReceive::UDPReceive(){}UDPReceive::UDPReceive(QUdpSocket *s){    this->udp_socket = s;}void UDPReceive::run(){        while(1)        {                                if (udp_socket->hasPendingDatagrams())                {                        if (udp_socket->pendingDatagramSize() >= rev_length)                        {                                                 ......                        }                }                }}//在mainwindow中调用UDPReceivevoid MainWindow::init_socket(){    udp_socket = new QUdpSocket(this);    udp_socket->bind(QHostAddress::Any, UDP_LISTEN_PORT, QUdpSocket::ReuseAddressHint);    QHostAddress mcast_addr("224.0.0.17");    //udp_socket->setSocketOption(QAbstractSocket::MulticastLoopbackOption, 0);//禁止本机接收    udp_socket->joinMulticastGroup(mcast_addr);    udp_receive = new UDPReceive(udp_socket);    udp_receive->start();}

以上程序在运行时报QSocketNotifier: socket notifiers cannot be enabled from another thread错误。

到网上查了查，原因应该是，不能跨线程调用QObject。mainwindow为窗口主线程，UDPReceive为数据传输线程，所以当我们在mainwindow中创建udp_socket，然后通过指针的方式传递给UDPReceive使用，属于跨线程调用QObject。

解决办法为：将新建upd套接字的相关代码移到UDPReceive中，这样就避免了跨线程调用QObject。

void UDPReceive::run(){    QUdpSocket udp_socket;    udp_socket.bind(QHostAddress::Any, this->udp_listen_port, QUdpSocket::ReuseAddressHint);    QHostAddress mcast_addr("224.0.0.17");    udp_socket.setSocketOption(QAbstractSocket::MulticastLoopbackOption, 0);//禁止本机接收    udp_socket.joinMulticastGroup(mcast_addr);    int rev_length = msg_max_length * 2 + 6;    while(1)    {        if (udp_socket.hasPendingDatagrams())        {            if (udp_socket.pendingDatagramSize() >= rev_length)            {            }        }    }}