将字节与十六进制进行比较？

问题描述

我需要将UDP数据包的前5个字节与两个定义进行比较，并根据它们对其进行相应处理。然而，我应该如何表示十六进制，因为这显然不会/不工作？

被评论的行是我原来的做法，但不是非常高效。

pre $ private static void HandleQuery（Socket套接字，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）;
返回字节;


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

返回true;



解决方案

更容易：

  // byte [] A2S_PLAYER = StringToByteArray（\xFF\xFF\xFF\xFF\ X55\" ）; 
 byte [] A2S_PLAYER =新字节[] {0xFF，0xFF，0xFF，0xFF，0x55​​}; 
  

I need to compare the first 5 bytes of a UDP packet to two definitions, and act on them accordingly if it matches one. However, how should I represent the Hex for this since this obviously won't/isn't working?

The commented lines are the original way I was doing it, but not very efficient.

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;
}

解决方案

You can fill a byte array easier:

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

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