Is this any use?
http://www.troz.net/rev/index.irev?category=Utility
I used the barcode tester with a wedge some time back to check what exactly the barcode reader was picking up. I also used the Key coder app. I seem to remember having to frame the barcodes with * in Linux, and a different character in Windows, to have them register properly.
You might need a copy of livecode to run this, which is free in the open source Community Edition now, from
Al