QT UDP Multicast (traversal)

http://blog.csdn.net/victoryknight/article/details/7814243 ThemesUDPQtRouters

If the two machines in the LAN are separated from each other, the communication between the two machines cannot be broadcast, but we can switch to the multicast communication to achieve the mutual communication effect.

A server-side

qudpsocket     Udp_socket; udp_socket.bind ( qhostaddress::any, Udp_listen_port, QUdpSocket:: Reuseaddresshint); qhostaddress mcast_addr (  "224.0.0.17"); udp_socket.setsocketoption (qabstractsocket::multicastloopbackoption, 0); //prevent native receive udp_socket .joinmulticastgroup (MCAST_ADDR); //This sentence is the key, join the multicast address            

At this point, we have completed the binding of the server and joined the work of the multicast group.

Two clients

Mcast_addr ("224.0.0.17");  The multicast address is the same as the server    udp_socket. Writedatagram (Datagram, mcast_addr, udp_send_port);  Send data to the server (Udp_send_port is the same as the server's listening port)    

Http://www.tuicool.com/articles/zUJVBj

QT UDP Multicast (traversal)