[Qt-interest] How to stop all threads before quit?

[Nicholas Shatokhin]

I'm creating a qt4 lib for using fingerprint scanner:  
https://github.com/NicholasShatokhin/fprint_qt

Scanner working in thread. If user close window, thread still running and  
program finishing unexpectedly. So, how can I close all threads before  
exiting program?

Best regards,
Nick.
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