将字节与十六进制比较?

时间:2011-07-31 12:15:17

标签: c# .net sockets bytearray hex

我需要将UDP数据包的前5个字节与两个定义进行比较,如果它匹配一个,则相应地对它们进行操作。但是,我应该如何代表Hex,因为这显然不会/不起作用?

注释行是我正在做的原始方式,但效率不高。

private static void HandleQuery(Socket socket, EndPoint Remote)
{
    byte[] A2S_INFO_REQUEST = StringToByteArray("\xFF\xFF\xFF\xFF\x54");
    byte[] A2S_PLAYER = StringToByteArray("\xFF\xFF\xFF\xFF\x55");

    byte[] data = new byte[1400];
    int recv = socket.ReceiveFrom(data, ref Remote);

    // A2S_INFO QUERY
    //if (recv == 25 && data[4] == 84)
    if (CompareByteArray(A2S_INFO_REQUEST, data, 5))
    {
        ReplyInfoQuery(socket, Remote);
    }

    // A2S_PLAYER QUERY
    //if (recv == 9)
    if (CompareByteArray(A2S_PLAYER, data, 5))
    {
        ReplyPlayerQuery(socket, Remote);
    }
}

private static byte[] StringToByteArray(String hex)
{
    int NumberChars = hex.Length;
    byte[] bytes = new byte[NumberChars / 2];
    for (int i = 0; i < NumberChars; i += 2)
    bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
    return bytes;
}

private static bool CompareByteArray(byte[] a1, byte[] a2, int len)
{
    for (int i = 0; i < len; i++)
    {
        if (a1[i] != a2[i])
        {
            return false;
        }
    }

    return true;
}

2 个答案:

答案 0 :(得分:2)

您可以更轻松地填充字节数组:

//byte[] A2S_PLAYER = StringToByteArray("\xFF\xFF\xFF\xFF\x55");
byte[] A2S_PLAYER = new byte[] {0xFF, 0xFF, 0xFF, 0xFF, 0x55} ;

答案 1 :(得分:0)

我建议将你的5个字节转换为long(System.Int64)。这样你甚至可以使用开关/案例来发送你的请求。