2 replies to this topic

[Sablis]

I have made a little application to convert a decimal value, into a hexadecimal value using the useful:

Convert.ToString(num, 16).ToUpper

But I want to reverse the hexadecimal value into bytes, for an example:

The hexadecimal value is:

3B45C

I want to reverse this value into bytes so it would be:

5C B4 03

Any suggestions? I would be very grateful for any help, as I am at a complete loss to where I should even start.

I am using Visual Basic 2008 Express Edition.

Edited by Sablis, 09 October 2009 - 02:50 PM.
Forgot to add what version of VB I use.

[marwex89]

I don't know if VB.NET has some kind of function for this that might help you, if not you could do it the hard way:

(in vb-ish pseudocode)

if (lengthOfHexString mod 2) != 0 then   
hexString = "0" + hexString

for(i =lengthOfHexString to 0, step 2)
    outputString = outputString + hexString[i-1] + hexString[i] + delimitingCharacter
next i

outputString = outputString - delimitingCharacter

I should have been in bed so my logic might be flawed, but try this. Do you understand the pseudocode?

[WingedPanther]

There's probably a right() function and a left() function (or a copy function) that will let you peel off 2 characters at a time from the right side of the string.