读取Colaso ft Packet Player用Qt发送的网络数据

Question

我试图通过Qt读取Colasoft Packet Player发送的数据。

我使用了一个IP为192.168.1.99的loopbackadapter，Wireshark给我看了这样的东西：

SourceIP：192.168.1.1

SourcePort：40102

DestinationIP：224.0.1.12

DestinationPort：49156

但是使用这些IP和端口，Qt QUdpSocket不会显示任何数据。当我尝试读取所有接收数据的端口和IP时，程序应该可以工作，但看起来，我没有得到Colasoft Packet Player发送的任何数据。

我做错了什么？

谢谢！

MyUDPSocket::MyUDPSocket(QObject *parent)
: QObject(parent)
{
    socket = new QUdpSocket(this);


    //socket->bind(QHostAddress("127.0.0.1"), 40102);
    //socket->bind(QHostAddress("127.0.0.1"), 49156);

    //socket->bind(QHostAddress("224.0.1.12"), 40102);
    //socket->bind(QHostAddress("224.0.1.12"), 49156);

    //socket->bind(QHostAddress("192.168.1.1"), 40102);
    //socket->bind(QHostAddress("192.168.1.1"), 49156);

    //socket->bind(QHostAddress("192.168.1.99"), 40102);
    //socket->bind(QHostAddress("192.168.1.99"), 49156);


    //socket->bind(QHostAddress::Any, 40102);
    //socket->bind(QHostAddress::Any, 49156);

    socket->bind(QHostAddress::Any, 49156, QUdpSocket::ShareAddress);   
    socket->joinMulticastGroup(QHostAddress("224.0.1.12"));
    connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()));
}

void MyUDPSocket::readyRead()
{
        // when data comes in
        QByteArray buffer;
        buffer.resize(socket->pendingDatagramSize());

        QHostAddress sender;
        quint16 senderPort;

        // qint64 QUdpSocket::readDatagram(char * data, qint64 maxSize, 
        //                 QHostAddress * address = 0, quint16 * port = 0)
        // Receives a datagram no larger than maxSize bytes and stores it in data. 
        // The sender's host address and port is stored in *address and *port 
        // (unless the pointers are 0).

        socket->readDatagram(buffer.data(), buffer.size(),
                             &sender, &senderPort);
        qDebug() << "
+-------------------------------";
        qDebug() << "|Message from:" << sender.toString(); 
        qDebug() << "|Message port:" << senderPort;
        qDebug() << "|Message:" << buffer;
        qDebug() << "+-------------------------------
";
    }
}