#include #include #include #include #define HELLO_PORT 50004 //#define HELLO_GROUP "239.255.0.0" #define HELLO_GROUP "127.0.0.1" struct sockaddr_in addr; int fd; void __stdcall SETUP_SSOCKET(void) { struct ip_mreq mreq; // Make sure that we have compatible Winsock support WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ exit(1); } /* Confirm that the WinSock DLL supports 2.2.*/ /* Note that if the DLL supports versions greater */ /* than 2.2 in addition to 2.2, it will still return */ /* 2.2 in wVersion since that is the version we */ /* requested. */ if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ WSACleanup( ); exit(1); } /* The WinSock DLL is acceptable. Proceed. */ /* create what looks like an ordinary UDP socket */ if ((fd=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP)) < 0) { perror("socket"); exit(1); } /* set up destination address */ memset(&addr,0,sizeof(addr)); addr.sin_family=AF_INET; addr.sin_addr.s_addr=inet_addr(HELLO_GROUP); addr.sin_port=htons(HELLO_PORT); } void __stdcall SEND_PKT(char buf[]) { if (sendto(fd,buf,1416,0, (struct sockaddr *) &addr, sizeof(addr)) < 0) { perror("sendto"); exit(1);} }