Get Mouse Wheel Scroll Using Win32api In Python

I want to read mouse wheel scroll events and then simulate them. I know I can simulate it using below code. #Scroll one up win32api.mouse_event(MOUSEEVENTF_WHEEL, x, y, 1, 0) #Scr

Solution 1:

If you need to get the global WM_MOUSEWHEEL message, you can use the SetWindowsHookEx function and with WH_MOUSE_LL hook.

Then handle the WM_MOUSEWHEEL message in the hook function.

Here is a sample:

import win32api 
import win32con
import ctypes
from ctypes import windll, CFUNCTYPE, POINTER, c_int, c_void_p, byrefuser32= ctypes.windll.user32kernel32= ctypes.windll.kernel32

def LowLevelMouseProc(nCode, wParam, lParam):
    ifwParam== win32con.WM_MOUSEWHEEL:
        print("mousewheel triggerd!")
    return windll.user32.CallNextHookEx(hook_id, nCode, wParam, lParam)

if__name__== '__main__':
    CMPFUNC = CFUNCTYPE(c_void_p, c_int, ctypes.wintypes.WPARAM, ctypes.wintypes.LPARAM)

    pointer = CMPFUNC(LowLevelMouseProc)
    hook_id = user32.SetWindowsHookExW(win32con.WH_MOUSE_LL,pointer,c_void_p(win32api.GetModuleHandle(None), 0)
    msg = ctypes.wintypes.MSG()
    while user32.GetMessageW(ctypes.byref(msg), 0, 0, 0) != 0:
        user32.TranslateMessage(msg)
        user32.DispatchMessageW(msg)

It works for me:

Edit

If there are problems like <class'OverflowError'>: int too long to convert, you can try the following code:

import win32api 
import win32con
import ctypes
from ctypes import windll, CFUNCTYPE, c_int, c_void_p, wintypesuser32= ctypes.windll.user32kernel32= ctypes.windll.kernel32
user32.CallNextHookEx.argtypes = [ctypes.wintypes.HHOOK,c_int, ctypes.wintypes.WPARAM, ctypes.wintypes.LPARAM]

 

def LowLevelMouseProc(nCode, wParam, lParam):
    ifwParam== win32con.WM_MOUSEWHEEL:
        print("mousewheel triggerd!")
    return user32.CallNextHookEx(hook_id, nCode, wParam, lParam)

 

if__name__== '__main__':
    CMPFUNC = CFUNCTYPE(c_void_p, c_int, ctypes.wintypes.WPARAM, ctypes.wintypes.LPARAM)
    user32.SetWindowsHookExW.argtypes = [c_int,CMPFUNC,ctypes.wintypes.HINSTANCE,ctypes.wintypes.DWORD]
    pointer = CMPFUNC(LowLevelMouseProc)
    hook_id = user32.SetWindowsHookExW(win32con.WH_MOUSE_LL,pointer,win32api.GetModuleHandle(None), 0)
    msg = ctypes.wintypes.MSG()
    while user32.GetMessageW(ctypes.byref(msg), 0, 0, 0) != 0:
        user32.TranslateMessage(msg)
        user32.DispatchMessageW(msg)