This sample detects QR codes and decodes them.
If the value of the QR code is a MIDI note number, that note is played. Use these QR codes to test (they are generated by the app):
If the value does not qualify as a MIDI note, the QR code is highlighted on the screen and the string data from the barcode is written to the console, eg:
Barcode string data: www.xamarin.com
Search online for a website or tool that can generate test QR codes.