string to array

[Broken_Arrow]

I've got a string indicator full of HEX data that I'd like to put into an array by twos. Sounds easy enough. Problem is, I want the data loaded into the array two characters at a time with no fluff - no tabs (such as converting to a spreadsheet string). Here's what I want:

String = A2FF0CFAB301FFA .........and so on for 2048 characters.
Array = (1)A2 (2)FF (3)F0 (4)CF (5)AB (6)30 (7)1F (8)FA  ...........and so on for 1024 indexes.

I've tried some tricks with the Quotient & Remainder function in a FOR loop, but so far to no avail. The attached picture shows what I've done, but when the Case goes True, I have to load the next Index with something, which is what I want to avoid.

In basic, I'd just use For i = 0 to 2048 STEP 2 and load the array that way. Any ideas?

[Darren]

Hi Richard,

Tricky problem...I think the String to Byte Array and Byte Array to String functions will help you.  I also used the Split 1D Array function in a loop to get the array items two at a time.  I've attached a LabVIEW 7.1 VI to this post that shows how I would do it.  I'm sure there's a more efficient way to do it, but this one was the most straightforward to me (i.e., it was the first thing I thought of).

Hope this helps,

-D

[Enrique]

Broken Arrow;

I am not sure if I understand your question. It is something like what I included in the picture?

Enrique

Message Edited by Enrique on 01-31-2006 10:32 PM

[alkazaa]

Is this what you want:

[Darren]

Bravo, fahlers.  This is definitely the best approach.  I always forget about Typecast when I'm playing around with data representations.  🙂

-D

[altenbach]

Not quite as nice as fahlers, here's another variation of the theme. 😉

[Broken_Arrow]

There's all great answers, thanks everyone. And I'm glad at least one person thinks it was "tricky".
I would have never come close to Fahlers' answer, which is the most concise solution (although I don't understand how the For loop knows how many N loops to do!)  The other solutions make sense - it looks like I was overlooking the "String to Byte Array" function. It's not in the Array pallette, which I think is an oversight.
Thanks to all!

[Darren]

The For Loop will iterate a number of times equal to the size of the array indexed into its border.  With fahlers' example, the array is half the size of the string length, since the string characters are grouped together two at a time when typecasting them to U16s (since a single character in a string is 8 bits, and a U16 is 16 bits).

-D

Message Edited by Darren on 02-01-2006 09:56 AM

[Broken_Arrow]

Ah yes. The secret is in the U16 specification of the array that is "Type Casted" into the For Loop. EXCELLENT. Now I don't have to worry if I'm reading a 2k EEPROM or larger (my original idea had the for loop "hard wired" for the expected count). Thanks!

[Robst]

Hi to all:

I just read the original post and tried to solve the problem my way. This is maybe a forgotten thread but anyway I did it. My method is shown in the picture. Of course less elegant than the other, but functional. I'm kind of new to the forums and I want to as active as possible.

Regards.