If you're using the Griaule Fingerprint SDK 2007 for the Microsoft Fingerprint Reader:
Register Event Callbacks (Active X palette), create Callback VI's to run for the various events (SensorPlug, SensorUnplug, FingerDown, FingerUp, ImageAcquired), and pass a User Event reference to your ImageAcquired Callback VI and pass Event Data to the Generate User Event when the callback VI runs. Then, when the image acquisition occurs, handle the subsequent User Event in your main code where you'll receive the "rawImage" as part of the Event Data. I had trouble with the ActiveX implemenation of the BiometricDisplay method, so have now switched to DLL for that (since it passes out HBITMAP). I'm working with NI to get the DLL to import correctly to see if the DLL is any better. I'm also working with Griaule to make sure its not on their end (e.g. bad "GrFinger.h" file during DLL import).
Will keep you posted.
Here's another forum where we worked through part of this:
-Jason
