Python: cannot find the handle with win32gui.FindWindowEx()

Question

I'm trying to ge the handle for "Yes" button in a dialog, so I can send the message to click it.

I get the dialog and then I try to find the button, but I always get 0 back.

import win32gui

hwnd = win32gui.FindWindow("#32770", "Programs and Features")
# got back the correct handle to the dialog

win32gui.SetForegroundWindow(hwnd)

btnhdl = win32gui.FindWindowEx(hwnd, 0, "Button", "&Yes")
# returns 0

The button is there and the class and title seem to be ok. I verified it by this:

def printClasses(childHwnd, lparam):
    if win32gui.GetWindowText(childHwnd) == "&Yes":
        print win32gui.GetClassName(childHwnd), win32gui.GetWindowText(childHwnd)
    return 1

win32gui.EnumChildWindows(hwnd, printClasses, None)
# output: Button &Yes

Looks like everything should be fine, but why it doesn't return the handle with FindWindowEx?

Thanks

Maybe the button is a child of a child, ie a grandchild? IIRC `EnumChildWindow` enumerates recursively while `FindWindowEx` does not. — rodrigo, May 10 '12 at 19:19
@rodrigo Yes, that is correct. It is actually two levels down. From the question [EnumChildWindows or FindWindowEx](http://stackoverflow.com/questions/1823628/enumchildwindows-or-findwindowex) I got an impression that they work similar way. You should probably post it as an answer, so I can accept it. Thanks — Alex Okrushko, May 10 '12 at 20:03

score 2 · Accepted Answer · answered May 10 '12 at 20:17

2

[From the comments in the OP] Maybe the button is a child of a child, ie a grandchild? IIRC EnumChildWindow enumerates recursively while FindWindowEx does not.

answered May 10 '12 at 20:17

rodrigo

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Unfortunately, FindWindowEx doesn't perform recursive search – Alex Okrushko May 11 '12 at 14:25

Python: cannot find the handle with win32gui.FindWindowEx()

1 Answers1