Yah wow... that was a while ago...
turned out I was doing it all wrong..
printing barcodes you need to use a dedicated barcode printer. all it will be very hard for scanners to read the barcodes.
These barcode printers use there own script which are in normal text .txt files.
and you control what is printed from the textfiles
if you required some major changes, you just repeatedly yell at the printer supplier over the phone until they come and take you request.