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C-/C++-Quelltext

bool GetBroadcastAddress( const char* ip, u_long* bcaddr )
{
    assert( ip != 0 && "invalid ip" );
    assert( bcaddr != 0 && "bcaddr mustn't be null" );

    in_addr addr;
    u_long broadcast = 0;

    if ( !inet_pton( AF_INET, ip, &addr ) ) {
        return false;
    }

    SOCKET socket = WSASocket( AF_INET, SOCK_DGRAM, 0, 0, 0, 0 );
    if ( socket == SOCKET_ERROR ) {
        return false;
    }

    INTERFACE_INFO ifaces[16];
    DWORD bytesReturned;
    if ( WSAIoctl( socket, SIO_GET_INTERFACE_LIST, 0, 0, &ifaces, sizeof( ifaces ),
        &bytesReturned, 0, 0 ) != SOCKET_ERROR )
    {
        int size = bytesReturned / sizeof( INTERFACE_INFO );
        for ( int i = 0; i < size; ++i )
        {
            sockaddr_in* pAddr = ( sockaddr_in* )&ifaces[i].iiAddress.Address; /* ipv4 */
            if ( pAddr->sin_addr.s_addr == addr.s_addr ) 
            {
                u_long mask = ifaces[i].iiNetmask.AddressIn.sin_addr.s_addr;
                u_long networkid = pAddr->sin_addr.s_addr & mask;
                broadcast = networkid | ~mask;
                break;
            }
        }
    }

    return broadcast != 0 && ( ( *bcaddr = broadcast ), 1 );
}

C-/C++-Quelltext

float xpos = 10,ypos = 10;
void * blabla = xpos;
void * blabla2 = ypos;


send (
  meinSocket,              
  blabla,  
  sizeof(blabla), // keine ahnung was ich da angeben muss              

  flags           // irgendwelche flags   

);
send (
  meinSocket,              
  blabla2,  
  sizeof(blabla2), // keine ahnung was ich da angeben muss              

  flags           // irgendwelche flags   

);