Hello, I am the funder of a mobile App.
The app has to do with food, and I am looking for a way for users to Scan the barcodes of foods at the shops at visualize nutritional informations and other stuffs that i fund relevant about that product.
Do you know how Can I obtain barcodes info from shops like Asda, waitrose, Sainsbury ecc?
Real UPC codes are in a master database controlled by GS1. Stores do NOT have to use real bar codes, so store brands often do not have their products in the database. In those cases you would need to contact each store, but then you might have overlap with things that have real barcodes. For example, a store brand could use barcodes belonging to some real hardware manufacturer. It won't matter in their store because the store doesn't sell hardware. But if you scanned those codes using the GS1 database, you'd get the wrong product. You'd get hardware, not food. There is no one easy way to get this information to include any products not part of the GS1 database.
you might try - http://www.barcoding.com
The guys that wrote Delicious Library for MacOS also did a bar code scanner for iOS library, there's also lots of open source implementations. All bar codes (on foods/etc) are a UPC codes and I think available on-line.
I'm not sure how it works but apps like Myfitnesspal do this so might be worth it checking them out !
Perhaps you need something like this? http://www.scandit.com/upc-lookup/
Adding to the other answers,
You can check an online service for scrapping the code presented into the barcode image, like "http://www.onlinebarcodereader.com/" or so. And there's also lot's of tutorials on the internet of how to do it (I mean, in programming).
Plus, check http://justgum.it/ , you guys have similar business models I think.