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When user scanned his finger, i want to learn which finger is printed, middle or second or nth.
Is it possible on IOS/CORDOVA or do you have an hack for it?
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Yes an no.
It is not possible to do this with the standard APIs. It is possible to do this with a jailbroken iOS device. (I just don't know how but I've seen demo videos of apps that use the fingerprint name to identify which finger was used.)
Please file a radar bug/feature request on this. It is a completely reasonable request. The more of us that do it, the greater the chance that Apple will give us the API we need.
While it is possible for a user to label their finger scans that is optional and un-reliable. Other than that I don't believe the software can detect which finger; even pet paws have even registered.
Further iOS does not keep the scanned finger print but that information may not help you.