String to byte array

Question

Possible Duplicate:
How do you convert Byte Array to Hexadecimal String, and vice versa, in C#?
Convert hex string to byte array

I've an string like this: "021500010000146DE6D800000000000000003801030E9738"

What I need is the following byte array: 02 15 00 01 00 00 14 6D E6 D8 00 00 00 00 00 00 00 00 38 01 03 0E 97 38 (each pair of number is the hexadecimal value in the respective byte).

Any idea about how can I make this conversion?? Thanks!!

The “possible duplicate” is a completely different question. He's not asking how to encode the string into a `byte[]` using some encoding. The string here contains hexadecimal values that should be converted to `byte[]`. — svick, Oct 24 '11 at 16:36
You pretty much want the second example on this page: http://msdn.microsoft.com/en-us/library/bb311038.aspx. The "meat" of it is Convert.ToInt32(hex, 16) (the second parameter specifies to convert from Base-16, which is Hex). I found this with Google: "C# parse hex" — abelenky, Oct 24 '11 at 16:46
I've also seen the "duplicate" thread, and I really think this is completely different. — Manu, Oct 24 '11 at 16:56
Looks like exact duplicate to me - please comment on how the linked questions are different from what you want: hex string -> byte array (and all samples so far are about the same as potential duplicate ones) — Alexei Levenkov, Oct 24 '11 at 17:42

score 5 · Accepted Answer · answered Oct 24 '11 at 17:23

5

var arr = new byte[s.Length/2];
for ( var i = 0 ; i<arr.Length ; i++ )
    arr[i] = (byte)Convert.ToInt32(s.SubString(i*2,2), 16);

answered Oct 24 '11 at 17:23

Dan Byström

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This code is really working well. But only a detail, right code is "s.Substring". Thanks to all. – Manu Oct 25 '11 at 14:06
Can use Convert.ToByte instead of ToInt32. – mikeazo Dec 13 '12 at 02:27

score 1 · Answer 2 · answered Oct 24 '11 at 16:58

You pretty much want the second example on this page.
The important part is:

Convert.ToInt32(hex, 16);

The first parameter is a 2-character string, specifying a hex-value (e.g. "DE").
The second parameter specifies to convert from Base-16, which is Hex.

Splitting the string up into two-character segments isn't shown in the example, but is needed for your problem. I trust its simple enough for you to handle.

I found this with Google: "C# parse hex"

Nick Rolando · Answer 3 · 2011-10-24T17:51:09.887

1

    string str = "021500010000146DE6D800000000000000003801030E9738";
    List<byte> myBytes = new List<byte>();

    try
    {
        while (!string.IsNullOrEmpty(str))
        {
            myBytes.Add(Convert.ToByte(str.Substring(0, 2), 16));
            str = str.Substring(2);
        }
    }
    catch (FormatException fe)
    {
        //handle error
    }
    for(int i = 0; i < myBytes.Count; i++)
    {
        Response.Write(myBytes[i].ToString() + "<br/>");
    }

edited Oct 24 '11 at 17:51

answered Oct 24 '11 at 17:20

Nick Rolando

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`Convert.ToByte` on an `int`? I mean, premature optimization is bad and all, but when the simplest approach is also faster... – Ben Voigt Oct 24 '11 at 17:31
@BenVoigt Ah, I found that right function to do in one convert. Thanks! – Nick Rolando Oct 24 '11 at 17:43

String to byte array

3 Answers3