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How to detect that Windows is locked?

How to detect that Windows is locked (Win + L or screensaver locked)? Is it possible?

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There is no documented way to check if a session is locked. However, there is a way to detect that the session is being blocked. Use WTSRegisterSessionNotification (), you will receive a WM_WTSSESSION_CHANGE message with the value WTS_SESSION_LOCK when the workstation is locked.

If you plan to do this from a service, be sure to turn off “session 0 session” to find out why this is not working.

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Source: https://habr.com/ru/post/904322/

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