I'm more a JScript person myself, but a few general concepts:
XOR'ing ASCII string characters will not give you anything useful. To make it
more difficult, the numbers and letters of a HEX string, in their ASCII values,
do not form a consecutive sequence. Nor are the A-F characters even in the
right part of the ASCII sequence (being 1-6 rather than an 0-5 which might at
least have been a bit useful). And, also, you've got upper/lower case A-F a-f
to contend with.
You've got to transform them before you can use them, then put them back so you
can display them. An easy way to do this is to have two functions: one takes a
single character as a parameter and returns an integer 0-15, the other does the
reverse.
You'll then need to loop through both strings and convert each character
(nibble). You can store the resultant integer values of the nibbles in many
different ways, although I suspect that an array of integers might be best,
with each nibble occupying its own spot in the array.
Once you've converted the two strings, you can buzz through the integer arrays
with a FOR loop and XOR each of the nibbles, either creating a third array or
going directly back to ASCII characters from the resultant nibble.
How you do the conversion from ASCII to/from integer depends on what you know
so far. A "select case" statement is a good candidate for converting from
ASCII, however, as it allows you to handle the whole thing (upper/lower case,
illegal characters) in one go. A "select case" could also be used to convert
back to ASCII, although an indexed lookup from an array or string of HEX
characters will also work fine.
Dave S
----- Original Message -----
From: Venkatesh Thathathripuram
To: [EMAIL PROTECTED]
Sent: Sunday, November 07, 2004 10:02 AM
Subject: [ASP] URGENT VB QUESTION
hey,
I need help in XOR'ing two HEX values.
I have two textboxes to take HEX strings , like
AAAA5555AAAA5555 and 5555AAAA5555AAAA, I need to get
the XOR value of the two which would be FFFFFFFFFFFFF
I am a newbie and have problems handling strings in
VB. Plz help. The output would be bytes like in a
scientific calculatore in Accessories.
Any help would be greatly appreciated,thanks.
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