Reverse byte array little endian

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Hello , pelase help me , i have a byte array b=new byte[4]{0,0,0,55}

i want output this as 00 37 00 00

i tried using

C#

if(BitConverter.IsLittleEndian)
    { b= Array.Reverse(b); }

and

C#

Array.Reverse(bytes, 0, bytes.Length);

    // to display
    BitConverter.ToString(b);

am getting output as 00 00 00 37 or 37 00 00 00

thanks

Posted 5-Dec-14 2:49am

GagKumar

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Comments

Thomas Daniels 5-Dec-14 8:58am

You talk about reversing the array, but the 55 becomes 37. Is that intentional?

Fredrik Bornander 5-Dec-14 9:02am

BitConverter.ToString will dump the values in hexadecimal format.

Thomas Daniels 5-Dec-14 9:06am

Oh, I see. I missed that it was hex format.

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Fredrik Bornander · Accepted Answer · 2014-12-05T03:01:00

You need to look at the content of the 32bit data as two sets of 16bit datums.

Something like this might work for you;

C#

using System;

namespace BitStuff {
    class Program {

        static void Swap(ref byte a, ref byte b) {
            var temp = a;
            a = b;
            b = temp;
        }

        static byte[] FlipInt16(byte[] rawData) {
            for (var i = 0; i < rawData.Length; i += 2) // Step two for 2x8 bits=16
                Swap(ref rawData[i], ref rawData[i + 1]);
            return rawData;
        }

        static byte[] FlipInt32(byte[] rawData) {
            for (var i = 0; i < rawData.Length; i += 4)  {// Step four for 4x8 bits=32
                Swap(ref rawData[i + 0], ref rawData[i + 2]);
                Swap(ref rawData[i + 1], ref rawData[i + 3]);
            }
            return rawData;
        }

        static void Main(string[] args) {
            var b = new byte[] { 0, 0, 0, 55 };
            Console.WriteLine("Original: {0}", BitConverter.ToString(b));
            if (BitConverter.IsLittleEndian) {
                FlipInt32(b);
            }
            Console.WriteLine("Adjusted: {0}", BitConverter.ToString(b));
        }
    }
}

Hope this helps,
Fredrik