7

Using Python Win32 extensions, how do you make an arbitrary window on Windows XP transparent?

3 Answers 3

16

SetLayeredWindowsAttributes example:

import win32gui
import win32con
import winxpgui
import win32api
import subprocess
import time

subprocess.Popen("notepad.exe", shell=True)
time.sleep(1)
hwnd = win32gui.FindWindow(None, "New file - metapad")  ## The caption of my empty notepad (MetaPad)

win32gui.SetWindowLong (hwnd, win32con.GWL_EXSTYLE, win32gui.GetWindowLong (hwnd, win32con.GWL_EXSTYLE ) | win32con.WS_EX_LAYERED )
winxpgui.SetLayeredWindowAttributes(hwnd, win32api.RGB(0,0,0), 180, win32con.LWA_ALPHA)
1
  • You can eliminate the winxpgui import by using win32gui.SetLayeredWindowAttributes()
    – Stevoisiak
    Commented Aug 14, 2018 at 14:56
3

You can use the SetLayeredWindowAttributes WIN32 API function for creating transparent windows:

BOOL WINAPI SetLayeredWindowAttributes(
  __in  HWND hwnd,
  __in  COLORREF crKey,
  __in  BYTE bAlpha,
  __in  DWORD dwFlags
);

Here is a code sample that you can use for wrapping WIN32 API functions for setting transparency.

0
import win32gui
import win32con
import winxpgui
import win32api
import subprocess
import time

subprocess.Popen("notepad.exe", shell=True)
time.sleep(1)
hwnd = win32gui.FindWindow(None, "New file - metapad")  ## The caption of my empty notepad (MetaPad)

win32gui.SetWindowLong (hwnd, win32con.GWL_EXSTYLE, win32gui.GetWindowLong (hwnd, win32con.GWL_EXSTYLE ) | win32con.WS_EX_LAYERED )
winxpgui.SetLayeredWindowAttributes(hwnd, win32api.RGB(0,0,0), 180, win32con.LWA_ALPHA)

This does not work for Windows 10.

1
  • Yes it does. I just tested it. In fact it even works on Windows 11 Commented Oct 16, 2021 at 20:01

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