windows_time_since_input.py

import time

import ctypes
from ctypes import Structure, POINTER, WINFUNCTYPE, windll
from ctypes.wintypes import BOOL, UINT, DWORD

class LastInputInfo(Structure):
    _fields_ = [
        ("cbSize", UINT),
        ("dwTime", DWORD)
    ]

# GetLastInputInfo
prototype = WINFUNCTYPE(BOOL, POINTER(LastInputInfo))
paramflags = (1, "lastinputinfo"),
GetLastInputInfo = prototype(("GetLastInputInfo", ctypes.windll.user32), paramflags)

# GetTickCount
prototype = WINFUNCTYPE(DWORD)
paramflags = ()
GetTickCount = prototype(("GetTickCount", ctypes.windll.kernel32), paramflags)

while True:
    time.sleep(1)

    l = LastInputInfo()
    l.cbSize = ctypes.sizeof(LastInputInfo)
    GetLastInputInfo(l)
    #print(l.dwTime/1000)
    #print(GetTickCount()/1000)

    seconds_since_input = (GetTickCount() - l.dwTime)/1000
    print(seconds_since_input)