typedef union
{
    struct
    {
        unsigned char bit1 : 1;
        unsigned char bit2 : 1;
        unsigned char bit3 : 1;
        unsigned char bit4 : 1;
        unsigned char bit5 : 1;
        unsigned char bit6 : 1;
        unsigned char bit7 : 1;
        unsigned char bit8 : 1;
    }u;
    unsigned char byte;
}byte_rep;

void PrintBinByte(unsigned char byte)
{
    byte_rep br;
    br.byte = byte;
    printf("%d: [1]%d [2]%d [3]%d [4]%d [5]%d [6]%d [7]%d [8]%d\n", byte,
        br.u.bit1,br.u.bit2, br.u.bit3,br.u.bit4, br.u.bit5, br.u.bit6, br.u.bit7, br.u.bit8);
}

int main()
{
    WSADATA wsd = { 0 };
    WSAStartup(MAKEWORD(2, 2), &wsd);
    struct sockaddr_in server;
    SOCKET s;
    if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == INVALID_SOCKET)
    {
        printf("Could not create socket : %d", WSAGetLastError());
    }
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons(3000);
    if (bind(s, (struct sockaddr *)&server, sizeof(server)) == SOCKET_ERROR)
    {
        printf("Bind failed with error code : %d", WSAGetLastError());
    }
    unsigned char *buf = new unsigned char[1024 * 4];
    int alen = sizeof(server),rec_len=0;
    for (;;)
    {
        rec_len = recvfrom(s, (char*)buf, 1024*4, 0, (struct sockaddr *) &server, &alen);
        printf("received bytes: %d\n", rec_len);
        PrintBinByte(buf[0]);
    }
    _getch();
    return 0;
}

public class Main
{
    private static void test1()
    {
        try
        {
            DatagramSocket clientSocket = new DatagramSocket();
            InetAddress IPAddress = InetAddress.getByName("localhost");
            byte[] sendData = new byte[16];
            DatagramPacket sendPacket = new DatagramPacket(sendData, /*sendData.length*/1, IPAddress, 3000);
            byte testData=(byte)255;
            sendData[0]=testData;
            clientSocket.send(sendPacket);
            clientSocket.close();
            System.out.println(Integer.toBinaryString(testData));
        } 
        catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
    public static void main(String[] args) 
    {
        // TODO Auto-generated method stub
        test1();
    }

}