C# - Convert a string of hex values to hex

Question

This might sound odd, but my issue is that I have a text string of hex values from a text file, like so:

"0x0f, 0x40, 0xff, ...."

I have stored them in an array split by the delimiters, but what I now need to do is have a byte array of what thay are in hex:

stringArray[0] = "0x0f";

byteArray[0] = 0x0f;

How do I do this (the user can load the text file, so I don't know what the values are), is there some sort of arithmetic I can use?

The question itself is valid in my opinion. Closing won't make him accept more answers, I guess. user646265: Please accept more answers that helped you. This will make more people want to help you. — OregonGhost
– OregonGhost, Commented Apr 13, 2011 at 10:02
Yes, I would have done, but I only just got above the 15 reputation that you need to accept answers. I will do so in future, now I am at 16 points. — user646265
– user646265, Commented Apr 13, 2011 at 12:15

Martin Liversage · Accepted Answer · 2011-04-13 10:02:49Z

3

If your string is in the correct format you can create your array using this code (will throw exceptions if the input is badly formatted):

var text = "0x0f, 0x40, 0xff";
var bytes = text
  .Split(new[] { ", " }, StringSplitOptions.None)
  .Select(s => (Byte) Int32.Parse(s.Substring(2), AllowHexSpecifier));

answered Apr 13, 2011 at 10:02

Martin Liversage

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Comments

Indy9000 · Accepted Answer · 2013-03-27 16:11:54Z

2

You just have to parse each string. Because each one is already only one value, you can do this:

byte b;
if (byte.TryParse(s, NumberStyles.HexNumber, 
    CultureInfo.InvariantCulture.NumberFormat, out b)) 
{
    // b contains the value.
}

where s is the string you want to parse, and b is the resulting value.

edited Mar 27, 2013 at 16:11

Indy9000

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answered Apr 13, 2011 at 10:00

OregonGhost

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2 Comments

user646265 Over a year ago

Thanks. When I get enough reputation points, I'll vote up your answer.

xanatos Over a year ago

I'll add that sadly the response is wrong. byte.TryParse doesn't support the 0x format. Read it here HexNumber Indicates that the AllowLeadingWhite, AllowTrailingWhite, and AllowHexSpecifier styles are used and AllowHexSpecifier Strings that are parsed using this style cannot be prefixed with "0x" or "&h"

vishal bhuva · Accepted Answer · 2013-03-19 10:47:30Z

0

Non of Odd hex string is correct. Check source from you get this string . It is because of truncation of string due to limit no of characters. If String is image is stored in database then retrieve it using program not using any tools

I was having same problem with .net and MSSQL and by using webservice and Java Client

answered Mar 19, 2013 at 10:47

vishal bhuva

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