I am learning to develop the functionality for this ZK4500 fingerprint scanner with C# to save the finger data into a .dat file. As I launch this for first time (there is no .dat file yet), i can add as many fingers as I want. But, if I close this and open it again to add a new finger, it says “Enroll failed, error code=-13” even when the previously enrolled fingers are there there.

I’m attempting to write a C program using libfprint, and it throws an undefined reference error when I attempt to compile something like: