MFC PostMessage from main project to UI thread

Question

I'm programming a very big software. It has a lot of projects inside it.

One of my projects is a UI thread. I want to post messages to this UI thread, from the main project.

When I use PostThreadMessage (after getting the thread by GetCurrentThreadId() ), everything works fine, except the times when a MessageBox is open...

So I want to send messages from the main project by PostMessage. How exactly can I send messages in that way? how do I know which window to send the message to?

Thanks

Answer 1

If it is an UI thread then you must have a primary window created in that thread. Just post message to this window. That's it.

EDIT 1: If it is another process, then probably you can create a hidden window with some unique title with special characters and underscores and use FindWindow API to find that window or use EnumWindows to enumerate top level windows and match the title.