VB Upnp协议测试程序_UDP穿透,寻找Upnp设备，此函数使用的UDP多播进行消息传递。所以收发函数和 Tcp的不同，VB用Winsock多播用了 WSAJoinLeaf函数绑定-VB Upnp protocol testing procedures _UDP penetrate, find Upnp device, this function uses UDP multicast for messaging. So different transceiver functions and Tcp, VB uses multicasting with Winsock function bindings WSAJoinLeaf