Saitek x45 mouse emulation

saitekmouse.py

import sys
import time
import win32gui, win32con, win32api, win32file, win32event, win32gui_struct, winnt
import threading
from pywinusb import hid

RIGHT_CLICK = 1<<(5-1)
LEFT_CLICK = 1<<(6-1)
ACTIVE     = 1<<(11-1)
UP         = 1<<(23-1)
RIGHT      = 1<<(24-1)
DOWN       = 1<<(25-1)
LEFT       = 1<<(26-1)

GUID_DEVINTERFACE_USB_DEVICE = "{A5DCBF10-6530-11D2-901F-00C04FB951ED}"
TICK = 0.025
deviceThread = None
movementThread = None
prevClick = False
prevRClick = False
dx = 0
dy = 0
speed = 0
BASE_SPEED = 0.08

def movement():
    global movementThread
    speed = BASE_SPEED
    startTime = time.time()
    prevTime = startTime-TICK
    errx = 0.
    erry = 0.
    while movementThread is not None:
        height = win32api.GetSystemMetrics(1)
        t = time.time()
        dt = t-prevTime
        prevTime = t
        
        movex = dx*speed*height*dt+errx
        movey = dy*speed*height*dt+erry
        imovex = int(round(movex))
        imovey = int(round(movey))
        errx = movex-imovex
        erry = movey-imovey
        
        win32api.mouse_event(win32con.MOUSEEVENTF_MOVE, imovex, imovey)
        elapsed = t-startTime
        speed = BASE_SPEED * (1 + 4.5*min(max(elapsed-0.25,0), 12))
            
        time.sleep(TICK)

def handler(data):
    global prevClick,prevRClick,dx,dy,movementThread
    if len(data) == 12 and data[0] == 0:
        buttons = data[8] | (data[9]<<8) | (data[10]<<16) | (data[11]<<24)
        if buttons & ACTIVE == 0:
            dx = 0
            dy = 0
            click = False
            rclick = False
        else:
            click = buttons & LEFT_CLICK != 0
            rclick = buttons & RIGHT_CLICK != 0
            if buttons & LEFT:
                dx = -1
            elif buttons & RIGHT:
                dx = 1
            else:
                dx = 0
            if buttons & UP:
                dy = -1
            elif buttons & DOWN:
                dy = 1
            else:
                dy = 0
        if dx or dy:
            if movementThread is None:
                movementThread = threading.Thread(target = movement)
                movementThread.daemon = True
                movementThread.start()
        elif movementThread is not None:
            movementThread = None
            
        if click != prevClick or rclick != prevRClick:
            m = (2 if click else 4) | (8 if rclick else 16)
            win32api.mouse_event(m, 0, 0, 0, 0)
            prevClick = click
            prevRClick = rclick

def findDevice():
    try:
        return hid.HidDeviceFilter(vendor_id = 0x06A3, product_id = 0x053C).get_devices()[0]
    except:
        return None
        
def identifyDevice(info):
    return 'VID_06A3&PID_053C' in info.name
            
def saitekMouse():
    global deviceThread
    while deviceThread is not None:
        time.sleep(1)
        try:
            device = findDevice() 
            if not device:
                continue
            device.open()
        except:
            print("Problem finding")
            continue
        print(device)
        device.set_raw_data_handler(handler)
        while deviceThread is not None and device.is_plugged():
            try:
                time.sleep(1)
            except:
                pass
        print("bye")
        device.close()
    deviceThread = None
    
def killThreads():
    global prevClick, prevRClick, dx, dy, deviceThread, movementThread, speed
    # TODO: watch out for race conditions
    deviceThread = None
    prevClick = False
    prevRClick = False
    dx = 0
    dy = 0
    speed = 0
    movementThread = None    

def OnDeviceChange(hwnd, msg, wp, lp):
    global deviceThread
    try:
        info = win32gui_struct.UnpackDEV_BROADCAST(lp)
    except:
        return False
#    if wp==win32con.DBT_DEVICEREMOVECOMPLETE:
#        print("remove",str(info))
#        if identifyDevice(info):
#            print("no Saitek x45")
#            deviceThread = None
    if wp==win32con.DBT_DEVICEARRIVAL:
        print("arrive",str(info))
        if identifyDevice(info):
            print("Saitek x45")
            if not deviceThread:
                deviceThread = threading.Thread(target = saitekMouse)
                deviceThread.daemon = True
                deviceThread.start()
    return True


wc = win32gui.WNDCLASS()
wc.lpszClassName = 'insertionnotify'
wc.lpfnWndProc={win32con.WM_DEVICECHANGE:OnDeviceChange}
win32gui.RegisterClass(wc)
hwnd = win32gui.CreateWindow(wc.lpszClassName,"insertionnotify",0,0,0,0,0,win32con.HWND_MESSAGE,None,None,None)
filter = win32gui_struct.PackDEV_BROADCAST_DEVICEINTERFACE(GUID_DEVINTERFACE_USB_DEVICE)
hdev = win32gui.RegisterDeviceNotification(hwnd, filter, win32con.DEVICE_NOTIFY_WINDOW_HANDLE)

def exitHandler(a,b=None):
    sys.exit(0)

win32api.SetConsoleCtrlHandler(exitHandler, True)

print("Press ctrl+break to stop...")

if findDevice():
    deviceThread = threading.Thread(target = saitekMouse)
    deviceThread.daemon = True
    deviceThread.start()

win32gui.PumpMessages()
while True:
    win32gui.PumpWaitingMessages()
    time.sleep(1)
    
win32gui.UnregisterDeviceNotification(hdev)    
win32gui.DestroyWindow(hwnd)
win32gui.UnregisterClass(wc.lpszClassName, None)