win: sleep monitor immediately

monitoroff.py

# -*- Mode: python; tab-width: 4; indent-tabs-mode: nil; coding: utf-8; -*-

from ctypes import *

user32 = WinDLL('User32')
DISPLAY_ON = -1
DISPLAY_OFF = 2
HWND_BROADCAST = 0xffff
WM_SYSCOMMAND = 0x0112
SC_MONITORPOWER = 0xf170
post_message = cast(user32.PostMessageA,
                    CFUNCTYPE(c_uint32, c_uint32, c_uint32, c_uint32, c_uint32))
lock_workstation = cast(user32.LockWorkStation, CFUNCTYPE(c_uint32))

post_message(HWND_BROADCAST,
             WM_SYSCOMMAND,
             SC_MONITORPOWER,
             DISPLAY_OFF)
# lock_workstation()