npZbar

This plug-in will allow you to scan BMP, JPG and PNG images in search of one or more bar-codes. Barcodes I25, EAN 8, EAN 13, UPC A, UPC E, ISBN 10, ISBN 13, CODE 39, CODE 128 and QR Codes are currently supported.

You can create one or more Zbar objects and use different events or share them between different instances. In a very simple way scan BMP or JPG images and execute the appropriate events when one or more bar-codes are found.