Getting list of visible, named windows in Windows 10

user_11792868 0
Viewed 1080

I am trying to get a list of open windows. I am stuck at this point. I have commented everything that does not work so far.

import win32gui

def winEnumHandler(hwnd, ctx):

    if win32gui.IsWindowVisible(hwnd):
        if win32gui.GetWindowText(hwnd) != "":
            wnd_name = win32gui.GetWindowText(hwnd)
            print(f'Type: {type(wnd_name)} Name: {wnd_name}')

            # return wnd_name
        # return wnd_name
    # return wnd_name

win32gui.EnumWindows(winEnumHandler, None)

This is an example of the output.

Type: <class 'str'> Name: vksts
Type: <class 'str'> Name: *new 10 - Notepad++
Type: <class 'str'> Name: _Chrome Downloads
Type: <class 'str'> Name: Microsoft Text Input Application
Type: <class 'str'> Name: Settings
Type: <class 'str'> Name: Program Manager

Although wnd_name is a string and I can print it, I can't figure out how to get its value to the main part of the script.

When I uncomment the 1st return wnd_name, I get the error message TypeError: an integer is required (got type str) for the line win32gui.EnumWindows(winEnumHandler, None).

When I uncomment the 2nd or 3rd return wnd_name, I get the error UnboundLocalError: local variable 'wnd_name' referenced before assignment for the line return wnd_name.

While win32gui.EnumWindows(winEnumHandler, None) is looping through the windows, how do I capture each window title and feed it to a list so that I end up with something like ['vksts','*new 10 - Notepad++','_Chrome Downloads',...]?

win32gui windows-10 python-3.x
1 Answers

Handler functions are something that are called by the code you provide it to. You try to return a string from the handler function you provide.

You get an error of TypeError: an integer is required (got type str) - that means that inside win32gui.EnumWindows(winEnumHandler, None) the returnvalue of your function (a string) is used for something that needs an integer - most probably the windowid/hwndid.

The other errors are because you left the scope of the variable if no window title is given so the variable is never instantiated and can not be returned because it is not know...

def winEnumHandler(hwnd, ctx): 
    if win32gui.IsWindowVisible(hwnd):
        if win32gui.GetWindowText(hwnd) != "":
            # you define the variable here
            wnd_name = win32gui.GetWindowText(hwnd)
            print(f'Type: {type(wnd_name)} Name: {wnd_name}') 
            return wnd_name
        # if win32gui.GetWindowText(hwnd)  == "" the wnd_name is never
        # created in the first place, so you get the UnboundLocalError 
        return wnd_name
    return wnd_name

You can try if

import win32gui

names = []

def winEnumHandler(hwnd, ctx):
    if win32gui.IsWindowVisible(hwnd):
        n = win32gui.GetWindowText(hwnd)  
        if n:
            names.append(n)
            print(n)

win32gui.EnumWindows(winEnumHandler, None)

print(names)

works for you.

user_75053950
Related