DZone Snippets: HEX code

Convert a decimal value to hex in Python

kodreaming () — Thu, 13 Jul 2006 19:12:37 GMT

// Convert a dec value to hex



hexValue = "%X" % 256

print hexValue  #100

c C++ convert hex to ascii

ocorpening (Owen Corpening) — Thu, 18 May 2006 20:37:52 GMT

// Presented with hex such as 0x12345abc perhaps there is a spot in there
// which represents an ascii char - such as 53 would be 'S'
// Common when dealing with hardware-related data structures and wire
// protocols



#include 

#include 



/*

*	To convert 53 to the character 'S':

*	char returnVal = hexToString('5', '3');

*/

char hexToAscii(char first, char second)

{

	char hex[5], *stop;

	hex[0] = '0';

	hex[1] = 'x';

	hex[2] = first;

	hex[3] = second;

	hex[4] = 0;

	return strtol(hex, &stop, 16);

}

int main(int argc, char* argv[])

{

	printf("%c\n", hexToAscii('5', '3'));

}

produces this output:
S

Csharp format integer as hex string

ocorpening (Owen Corpening) — Thu, 18 May 2006 20:25:18 GMT

// Using the built in ability to print a byte as a hex value
// this set of methods gives the ability to print shorts
// and longs as hex using the spacing that is customary.



using System;



namespace testApp

{

	/// 

	/// Summary description for Class1.

	/// 

	class Class1

	{

		/// 

		/// The main entry point for the application.

		/// 

		[STAThread]

		static void Main(string[] args)

		{

			Class1 t = new Class1();

			long i = 12; // 

			Console.WriteLine(t.int32ToHexString(i));

		}



		private string int32ToHexString(long i)

		{

			byte[] int32Bytes;

			int32Bytes = BitConverter.GetBytes(i);

			return String.Format("{0}{1}{2}{3}",

				padString(int32Bytes[0].ToString("X")),

				padString(int32Bytes[1].ToString("X")),

				padString(int32Bytes[2].ToString("X")),

				padString(int32Bytes[3].ToString("X")));

		}



		private string int16ToHexString(short i)

		{

			byte[] int32Bytes;

			int32Bytes = BitConverter.GetBytes(i);

			return String.Format("{0}{1}",

				padString(int32Bytes[0].ToString("X")),

				padString(int32Bytes[1].ToString("X")));

		}



		private string byteToHexString(byte b)

		{

			return padString(String.Format("{0}", b.ToString("X")));

		}



		private string padString(string s)

		{

			while (s.Length < 2) s = "0" + s;

			while (s.Length < 3) s = " " + s;

			return s;

		}

	}

}

produces this output:
0C 00 00 00

str_hex and hex_str

jonasj (Jonas J.) — Tue, 16 May 2006 01:41:34 GMT

// Convert hex to string and vice versa.
//
// (Source: http://codedump.jonasjohn.de/)



function str_hex($string){

    $hex='';

    for ($i=0; $i < strlen($string); $i++){

        $hex .= dechex(ord($string[$i]));

    }

    return $hex;

}





function hex_str($hex){

    $string='';

    for ($i=0; $i < strlen($hex)-1; $i+=2){

        $string .= chr(hexdec($hex[$i].$hex[$i+1]));

    }

    return $string;

}



// example:



$hex = str_hex("test sentence...");

// $hex contains 746573742073656e74656e63652e2e2e



print hex_str($hex);

// outputs: test sentence...

HEX to RGB

edolecki (eric e. dolecki) — Fri, 22 Apr 2005 03:57:21 GMT



function hexToRGB ( hex:Number ){

   var returnObj:Object = new Object();   

   var returnObj .r = hex >> 16;

   var temp = hex ^ r << 16;

   var returnObj .g = temp >> 8;

   var returnObj .b = temp ^ g << 8;



   return returnObj;

}

RGB to HEX

edolecki (eric e. dolecki) — Fri, 22 Apr 2005 03:55:10 GMT



function RGBToHex (r, g, b ){

    var hex = r << 16 ^ g << 8 ^ b;

   return hex;

}