How to get mouse input from extended frame?

Question

I have a window which has a extended frame. It looks like this:

I've followed all steps in MSDN's guide for extended frames: Custom Window Frame Using DWM.

But the problem is: I can't capture mouse movement over the extended frame. I don't receive the WM_MOUSEMOVE message, and WM_NCMOUSEMOVE is only received on the resize area and on the top part of the extended frame, which is not what I need.

I've already tried SetCapture but it doesn't allows me to minimize, maximize, close, move nor resize the window, not to mention that it shows the "Working..." cursor.

Does someone know how to solve this?

Answer 1

The problem was simpler than I thought. It was a naive response to WM_NCHITTEST: "if it's not a window border, then it's HTNOWHERE". Changing it to HTCLIENT solved my problem.

A weird thing is that that MSDN page tells us to use HTNOWHERE.