In Python 3, how can I tell if Windows is locked?

Question

How can I check whether a Windows OS workstation is locked? (e.g. Win+L or choosing the lock option after Ctrl+Alt+Del.)

I want something like ctypes.windll.us

Answer 1

A hacky I discovered to get around to see if Windows 10 is locked is to look at the running processes using psutil. You then search to see if LogonUI.exe is running. This process only runs if there when a user has a locked session.

Note: If you use switch users this process will show as running and this workaround will not work. Windows actually spawns multiple LogonUI.exe processes, one per logged on locked user. It is only useful where only one person is logged on at a time.

import psutil

for proc in psutil.process_iter():
    if(proc.name() == "LogonUI.exe"):
        print ("Locked")