C#

Process[] sameProcesses = Process.GetProcessesByName(Process.GetCurrentProcess().ProcessName);
if(sameProcesses.Length == 1)
{
   //... only 1 process, is ok.
}
else
{
   //... more than 1 process, is not ok.
}

MrEyes wrote:

I need to convert that intial string into it human readable format

string humanReadable = inputString.Replace("4e554c4c00","NULL");

MrEyes wrote:

Which is a HEX representation of NULL

4e554c4c00

4e
55
4c
4c

N
U
L
L

byte[] b = new byte[4] {0x4e, 0x55, 0x4c, 0x4c};
string s = System.Text.Encoding.ASCII.GetString(b);

static string HexToString(string input)
{
	byte[] b = new byte[input.Length / 2];
	for(int i = 0; i < input.Length; i+=2)
		b[i / 2] = byte.Parse(input.Substring(i, 2), NumberStyles.HexNumber);
			
	return System.Text.Encoding.ASCII.GetString(b);
}

stancrm wrote:

First you must change your "4e554c4c" into byte array.

public static string HexToString(string input)
{
	input = input.Substring(0, input.Length - 2); //remove terminator

	byte[] b = new byte[input.Length / 2];
	
	for(int i = 0; i < input.Length; i+=2)
	{
		b[i / 2] = byte.Parse(input.Substring(i, 2), System.Globalization.NumberStyles.HexNumber);
	}
	
	return System.Text.Encoding.ASCII.GetString(b);
}

private static string HexToText(string hex)
{
   string result = string.Empty;
   
   for (Int32 i = 0; i < hex.Length; i += 2)
      result += (char)byte.Parse(hex.Substring(i, 2), System.Globalization.NumberStyles.HexNumber);
   
   return result;
}

Sean Michael Murphy wrote:

(char)byte.Parse(hex.Substring(i, 2), System.Globalization.NumberStyles.HexNumber)

public string DecryptHexString(string text) {
    string output = string.Empty;

    for (int i = 0; i < text.Length; i += 2) {
        int hval = DeHex(text.Substring(i, 2));
        int temp = (hval ^ (output.Length + 1) % 256);
        output += (char)temp;
    }
    return output;
}

private int DeHex(string input) {
    int val;
    int result = 0;
    for (int i = 0; i < input.Length; i++) {
        string chunk = input.Substring(i, 1).ToUpper();
        switch (chunk) {
            case "A":
                val = 10; break;
            case "B":
                val = 11; break;
            case "C":
                val = 12; break;
            case "D":
                val = 13; break;
            case "E":
                val = 14; break;
            case "F":
                val = 15; break;
            default:
                val = int.Parse(chunk); break;        
        }
        if (i == 0) {
            result += val * 16;
        } else {
            result += val;
        }
    }
    return result;
}