String to byte array [duplicate]

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
– svick, Commented Oct 24, 2011 at 16:36
You pretty much want the second example on this page: 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
– abelenky, Commented Oct 24, 2011 at 16:46
I've also seen the "duplicate" thread, and I really think this is completely different. — Manu
– Manu, Commented Oct 24, 2011 at 16:56

Dan Byström · Accepted Answer · 2011-10-24 17:23:25Z

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, 2011 at 17:23

Dan Byström

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2 Comments

Manu Over a year ago

This code is really working well. But only a detail, right code is "s.Substring". Thanks to all.

mikeazo Over a year ago

Can use Convert.ToByte instead of ToInt32.

abelenky · Accepted Answer · 2011-10-24 16:58:56Z

1

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"

answered Oct 24, 2011 at 16:58

abelenky

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Comments

Nick Rolando · Accepted Answer · 2011-10-24 17:51:09Z

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, 2011 at 17:51

answered Oct 24, 2011 at 17:20

Nick Rolando

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2 Comments

Ben Voigt Over a year ago

Convert.ToByte on an int? I mean, premature optimization is bad and all, but when the simplest approach is also faster...

Nick Rolando Over a year ago

@BenVoigt Ah, I found that right function to do in one convert. Thanks!

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