After a lot of google searching, all I am finding are people linking to full apps that are QR Code Readers... What I want to do is create an app that has, within it, a "scan" button that lets you scan a QR code (results of which would be text-based and used to pass a variable or sort of an ID number) -- much like a UPC scanner in a store to scan the item's serial-number (via bar-code) and pull up the price and title information from the existing system's database, rather than from the bar-code... but I need it to be part of an app rather than the whole app.

Can anyone point me in the right direction?