C / C++ / MFC

int main()
{
	// Starta Winsock
    WSAData wsaData;
	int nCode;
    if ((nCode = WSAStartup(MAKEWORD(2, 0), &wsaData)) != 0)
	{
		cout << "Ett fel inträffades när Winsock skulle startas, felkod " << nCode << "." << endl;
        return 1;
    }

	SOCKET       s;
	BOOL         bBroadcast;
	char         *sMsg = "This is a test";

	SOCKADDR_IN bcast;

	s = WSASocket(AF_INET, SOCK_DGRAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);

	bBroadcast = TRUE;

	setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&bBroadcast, sizeof(BOOL));

	u_long host_addr = inet_addr("192.169.244.152");   // local IP addr
    u_long net_mask = inet_addr("255.255.255.128");   // LAN netmask
    u_long net_addr = host_addr & net_mask;         
    u_long dir_bcast_addr = net_addr | (~net_mask);


	bcast.sin_family = AF_INET;
	bcast.sin_addr.s_addr = inet_addr(dir_bcast_addr);
	bcast.sin_port = htons(5150);

	sendto(s, sMsg, strlen(sMsg), 0, (SOCKADDR *)&bcast, sizeof(bcast));

	while(TRUE)
	{
		char* buffer = new char[1024];
		SOCKADDR_IN sender;
		int sos = sizeof(sender);

		int ret = recvfrom(s, buffer, sizeof(buffer), MSG_OOB, (SOCKADDR*)&sender, &sos);
		
		if (ret == SOCKET_ERROR)
        {
            printf("recvfrom() failed; %d\n", WSAGetLastError());
            break;
        }
        else if (ret == 0)
		{
            break;
		}
        else
        {
            buffer[ret] = '\0';
            printf("[%s] sent me: '%s'\n", inet_ntoa(sender.sin_addr), buffer);
        }

		delete [] buffer;
	}

	closesocket(s);
	WSACleanup();

	return 0;
}