python win32 simulate click

Question

Let\'s say I\'ve got a window for which I want to simulate a mouse click at a specific x, y coordinate. I already have the hwnd but I\'m not sure how to construct the lParam

Answer 1

You can use the low level windows api thanks to ctypes. See an example below (adapted from something i didn't test it but it should be ok)

import ctypes
MOUSEEVENTF_MOVE = 0x0001 # mouse move
MOUSEEVENTF_ABSOLUTE = 0x8000 # absolute move
MOUSEEVENTF_MOVEABS = MOUSEEVENTF_MOVE + MOUSEEVENTF_ABSOLUTE

MOUSEEVENTF_LEFTDOWN = 0x0002 # left button down 
MOUSEEVENTF_LEFTUP = 0x0004 # left button up 
MOUSEEVENTF_CLICK = MOUSEEVENTF_LEFTDOWN + MOUSEEVENTF_LEFTUP

def click(x, y):
    #move first
    x = 65536L * x / ctypes.windll.user32.GetSystemMetrics(0) + 1
    y = 65536L * y / ctypes.windll.user32.GetSystemMetrics(1) + 1
    ctypes.windll.user32.mouse_event(MOUSEEVENTF_MOVEABS, x, y, 0, 0)

    #then click
    ctypes.windll.user32.mouse_event(MOUSEEVENTF_CLICK, 0, 0, 0, 0)

Update: I didn't test the code below but I think that it should help you to write something to get the child position. Then you can try to click at the correct position.

CHILD= None

def the_callback(child_hwnd, regex):
    '''Pass to win32gui.EnumWindows() to check all the opened windows'''
    if re.match(regex, win32gui.GetWindowText(child_hwnd)):
        CHILD= child_hwnd

win32gui.EnumChildWindows(hwnd, the_callback, regex)


if CHILD:
    (x_tl, y_tl, x_br, y_br) = win32gui.GetWindowRect(CHILD)