The Fingerprint SDK contains a sample biometric application in many programming languages. The samples are all similar. In the "bin" folder of each programming language folder you will find the sample executable file. The sample main window seems like the one below:
The largest box shows the last fingerprint acquired from a fingerprint reader or loaded from a file. Each reader scans images in a specific size (width and height), but the samples resize all images to the same size before displaying them. The box on the bottom of the window shows status messages, e.g. when a reader is plugged or unplugged, a finger is placed over a reader, etc.
By clicking the "Extract template" button, the last acquired fingerprint image is analyzed and its minutiae and segments are identified, extracted and displayed on screen.
The "Enroll" button saves the last extracted template into the database, and the ID of the enrolled template is displayed in the log box.
Placing a finger already enrolled in the database over the reader, waiting the image being acquired and clicking the "Identify" button will perform an identification; clicking the "Verify" button will perform a verification. In the latter case the sample will ask you the fingerprint ID you want to verify. In both cases the result will be displayed in the log box.
By checking the "Auto identify" option, whenever a finger is placed over the reader, the sample will try to automatically identify the fingerprint; the result will be shown in the log box.
To delete all the fingerprints enrolled in the database, click the "Clear database" button.
To clear the log box, use the "Clear log" button.
To save the currently displayed fingerprint image to a file, select the option "Save..." in the "Image" menu.
To load a fingerprint image saved in BMP format, select the option "Load from file..." in the "Image" menu.
Selecting the "Options..." menu causes a new window to be opened. In this window it's possible to change the identification and verification thresholds, the fingerprint rotation tolerance and also the colors used to display the fingerprint minutiae, their directions and segments.