Communication between WinApi and hosted WinUI

Question

Hello,
i have a few question for hosting a WinUI UI as an editor for my WinApi background app.

https://learn.microsoft.com/de-de/windows/apps/desktop/modernize/host-custom-control-with-xaml-islands-cpp

1. Is there a possibility that I will have problems when I want the XAML UI to communicate with the WinApi part?
   (I want to save/ edit values in the XAML UI in a for i.e. resource file and tell the WinApi part to read the settings from the resource file [or may be a xml])
   2. Only WinUI 2 controls are supported? I will need listviews, dropdown boxes, radio buttons and something like a navigation view [slide menu], i won't have any problems there?

Answer 1

XAML Islands for WinUI 3 is not ready yet : 1-under-consideration
(some XAML controls can be embedded like I explained in this thread, but it is just a workaround and not really usable)

You should do the reverse, Win32 APIs in a WinUI 3 app
(as unpackaged WinUI 3 apps are standard Win32 apps, you can do anything a C++/Win32 app can do)
From what you wrote in other threads, you can put it in background (just no window), add a Tray icon with Shell_NotifyIcon, etc...

Answer 2

Even if the memory consumption of the UI is very small, wouldn't it still be possible to free up the memory with WinUI as a component?
The UI only serves as an editor and is rarely used (0.000001% of the time).

Forget the following: *> Aha ok, i understand.

I've just seen the message "This UWP process group is suspending processes to improve system performance" in the taskmanager for OneNote. So this is the default behaviour, if you minimize/close the UI in UWP (?!).*