DayZ AutoRun Python Script with NumLock Toggle

dayz_autorun.py

import ctypes, time, win32api, win32gui

user32, SendInput = ctypes.WinDLL('user32', use_last_error=True), ctypes.windll.user32.SendInput

# community.bistudio.com/wiki/DIK_KeyCodes
DIK_W	   = 0x11
DIK_LSHIFT = 0x2A
# msdn.microsoft.com/en-us/library/dd375731
VK_NUMLOCK = 0x90

# c struct redefinitions
PUL = ctypes.POINTER(ctypes.c_ulong)
class KeyBdInput(ctypes.Structure):
    _fields_ = [("wVk", ctypes.c_ushort), ("wScan", ctypes.c_ushort), ("dwFlags", ctypes.c_ulong), ("time", ctypes.c_ulong), ("dwExtraInfo", PUL)]
	
class HardwareInput(ctypes.Structure):
    _fields_ = [("uMsg", ctypes.c_ulong), ("wParamL", ctypes.c_short), ("wParamH", ctypes.c_ushort)]
	
class MouseInput(ctypes.Structure):
    _fields_ = [("dx", ctypes.c_long), ("dy", ctypes.c_long), ("mouseData", ctypes.c_ulong), ("dwFlags", ctypes.c_ulong), ("time",ctypes.c_ulong), ("dwExtraInfo", PUL)]
	
class Input_I(ctypes.Union):
    _fields_ = [("ki", KeyBdInput), ("mi", MouseInput), ("hi", HardwareInput)]
	
class Input(ctypes.Structure):
    _fields_ = [("type", ctypes.c_ulong), ("ii", Input_I)]
	
# functions
def key_state(VK_CODE):
	return bool(user32.GetKeyState(VK_CODE))
	
def toggle_state(*args):
	for VK_CODE in args:
		if key_state(VK_CODE):
			win32api.keybd_event(VK_CODE,0,0,0)
		
def active_window(window_name):
	window = win32gui.GetForegroundWindow()
	if str(win32gui.GetWindowText(window)) == window_name:
		return True
	return False
	
def find_window(window_name):
	if win32gui.FindWindow(None, window_name):
		return True
	return False
	
def press(*args):
	for DIK_CODE in args:
		extra = ctypes.c_ulong(0)
		ii_ = Input_I()
		ii_.ki = KeyBdInput(0, DIK_CODE, 0x0008, 0, ctypes.pointer(extra))
		x = Input(ctypes.c_ulong(1), ii_)
		ctypes.windll.user32.SendInput(1, ctypes.pointer(x), ctypes.sizeof(x))
		
def release(*args):
	for DIK_CODE in args[::-1]:
		extra = ctypes.c_ulong(0)
		ii_ = Input_I()
		ii_.ki = KeyBdInput(0, DIK_CODE, 0x0008 | 0x0002, 0, ctypes.pointer(extra))
		x = Input(ctypes.c_ulong(1), ii_)
		ctypes.windll.user32.SendInput(1, ctypes.pointer(x), ctypes.sizeof(x))
		
def hold(*args):
	press(*args)
	time.sleep(.05)
	release(*args)

# main
if __name__ == "__main__":
	toggle_state(VK_NUMLOCK)
	while True:
		if not find_window('DayZ'):
			toggle_state(VK_NUMLOCK)
			break
		elif key_state(VK_NUMLOCK) and active_window('DayZ'):
			hold(DIK_LSHIFT, DIK_W)
		else:
			time.sleep(0.5)