场景

需要开发一个服务器发现模块，等待客户端的探测报文。在Linux服务器下组播地址imr_interface可以不绑定

mcast.imr_multiaddr.s_addr = inet_addr("239.255.255.250");

mcast.imr_interface.s_addr = htonl(INADDR_ANY);

但是在windwos服务器下必须绑定一个指定的IP地址，否则无法收到任何的组播探测包

具体代码

//加入设备组，设备发现

DWORD WINAPI OnvifBeDiscovered(LPVOID p)

{

struct soap UDPserverSoap;

struct ip_mreq mcast;

soap_init1(&UDPserverSoap, SOAP_IO_UDP | SOAP_XML_IGNORENS);

soap_set_namespaces(&UDPserverSoap, namespaces);

SOAP_SOCKET localSocket = soap_bind(&UDPserverSoap, NULL, 3702, 10);

if (!soap_valid_socket(localSocket))

{

soap_print_fault(&UDPserverSoap, stderr);

exit(1);

}

mcast.imr_multiaddr.s_addr = inet_addr("239.255.255.250");

mcast.imr_interface.s_addr = inet_addr("192.168.58.173");

//IP_ADD_MEMBERSHIP用于加入某个多播组，之后就可以向这个多播组发送数据或者从多播组接收数据

if (setsockopt(UDPserverSoap.master, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*)&mcast, sizeof(mcast)) < 0)

{

printf("setsockopt error! error code = %d,err string = %s\n", errno, strerror(errno));

return 0;

}

SOAP_SOCKET clientSocket = -1;

while (1)

{

clientSocket = soap_accept(&UDPserverSoap);

if (!soap_valid_socket(clientSocket))

{

soap_print_fault(&UDPserverSoap, stderr);

exit(1);

}

if (soap_serve(&UDPserverSoap) != SOAP_OK)

{

soap_print_fault(&UDPserverSoap, stderr);

}

soap_destroy(&UDPserverSoap);

soap_end(&UDPserverSoap);

}

soap_done(&UDPserverSoap);

}