How to implement finger scanner in desktop application?

Hi
First of all you need finger print reader here you can see different modules of finer print reader. after selecting your target finger print reader module for example Microsoft Finger Print Reader or other modules you should use SDK.
What is SDK?
Each device (finger print reader and lab lab lab) has some DLL for developers that call SDK(Software Development Kit) so you can use your device SDK`s to the using this device from your application. Finger Print Reader SDK`s gave you some methods(Functions) same as Finger Recognition, Finger Grab, Finger Detect and lab lab lab
You just need use your device SDK from your application of course you should pay attention to your application platform. for example if your application is .net you should be sure your device SDK`s support .net ;-)

for getting more information:

A Framework in C# for Fingerprint Verification[^]
Fingerprint Reader Integration using the M2SYS SDK[^]

Best Regards.