Dividing window into regions

I would like to divide a window into irregularly shaped regions that I would name, for instance, Region 1, Region 2, etc. What I want to do is when the window is clicked using the mouse my code should alert me as to which region is being accessed, perhaps via a message box. How can I partition my window?

Thanks in advance.

First you have this post on the wrong board, it should be on the Windows Programming board. Secondly you need to do a hit test in response to the WM_MOUSEMOVE event to know where the pointer is. Or since you want this information during the click you would handle it during a WM_LBUTTONDOWN or WM_LBUTTONUP message.

Moved thread

Look up regions.

Specifially look up:
CreatePolygonRgn() and CreatePolyPolygonRgn()

And you can then use PtInRegion() (pointer in region) which will tell you if the pointer is inside the region (pass it the region handle and the LO/HI word of lParam in the mouse messages.

Haven't tested this just looked it up then in the reference, so it may not be what you're looking for.