Forbidden DwmGetWindowAttribute usage

[bmarques1995]

In the file win32_window lines 1277 and 1296, the function DwmGetWindowAttribute saved in DwmGetWindowAttributeFunc are used to retrieve the DWMWA_WINDOW_CORNER_PREFERENCE and the DWMWA_BORDER_COLOR, but this usage for both cases is forbidden, like described in the Microsoft Docs.

Now this issue is not getting misbehavior, but it can causes a crash:

Returning error: clientcore\windows\dwm\dwmapi\attribute.cpp(174)\dwmapi.dll!00007FFE7F18254E: (caller: 00007FFD34734801) ReturnHr(1) tid(b488) 80070057 incorrect parameter.:

For ilustration, these are the forbidden usages:

DwmGetWindowAttributeFunc(hwnd, DWMWA_WINDOW_CORNER_PREFERENCE, &oldPref, sizeof(oldPref))

DwmGetWindowAttributeFunc(hwnd, DWMWA_BORDER_COLOR, &oldPref, sizeof(oldPref))

[slouken]

What's the correct way to handle this? Feel free to submit a PR that fixes this for you?

[bmarques1995]

Ok, this is only for registration

[slouken]

Fixed, thanks!