The barcode is actually a mechanism that is used to retrieve data from a printed form. If you have your form inside Acrobat then you can simply use the Tools, Forms, Data Export function to extract and then possibly re-import the data from your form.
If you do have a printed form that you are scanning you will need to write the process that decodes and then populates your form again from the extracted data.
Hi Leesutton...Thanks for the reply..i am on correct route now.. Can elaborate on process that decodes the barcode? Do i need to program it or something else?