QT中UDP在广域网的通信怎么实现

个牵扯到的是网络技术，和qt已经没有多少关系了

主要思想就是2个

服务器转发和NAT穿透。一般来说都会使用服务器转发，在传输文件的时候可以用NAT穿透，来缓解服务器的压力。

你在这里只能求思路，转发服务器是个大家伙，不是几行代码就搞的定的。

路由器的端口号与你机器的端口号是不一样的（你做了端口映射，对方没有，他接收不到）可以有个中间服务器，对方电脑先与服务器通信（告知Ip和端口），你与服务器通信（获取对方的Ip和端口），也就是NAT穿透；路由端如何支持UPNP协议的话，应该不需要做端口映射；你可以看看UPNP协议

//bool tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port )//失败 没指定 是IPV4还是IPV6

//    QString string("192.168.112.10")

//    QHostAddress address(QHostAddress::LocalHost)//QHostAddress::Any

//    bool tf =address.setAddress( string )

//    tf =m_pSocket->bind(address,m_port )//失败

//    quint32 ip4Add = 192<<24|168<<16|112<<8|10

//    QHostAddress address(QHostAddress::Any)//QHostAddress::LocalHost

//    address.setAddress( ip4Add )

//    bool tf =m_pSocket->bind(address,m_port )//失败

    //quint32 ip4Add = 192<<24|168<<16|112<<8|100

    //bool tf =m_pSocket->bind(QHostAddress(ip4Add),m_port,QAbstractSocket::ShareAddress )

    //tf =m_pSocket->bind(QHostAddress(ip4Add),m_port,QAbstractSocket::ReuseAddressHint| QAbstractSocket::ShareAddress | QAbstractSocket::DontShareAddress )

    //tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::ReuseAddressHint| QAbstractSocket::ShareAddress | QAbstractSocket::DontShareAddress )//失败

//    tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::ReuseAddressHint )

//    tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::ShareAddress  )

//    tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::DontShareAddress )

    //tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::ReuseAddressHint | QAbstractSocket::ShareAddress  )

    //tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::DontShareAddress | QAbstractSocket::ReuseAddressHint  )

    //tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::DontShareAddress | QAbstractSocket::ShareAddress  )

    //m_pSocket->bind(QHostAddress::Any, m_port )//方便使用

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