Windows pointer bitmap not being correctly updated

Question

So, I'm writing a text editor, using MDI.

I have a frame window, child windows and each child window has a text-area window.

Now, my problem is the pointer. It's not setting itself to the correct bitmap. So for example, if I move the pointer to the border, it correctly turns into the left-right drag icon. That's all good and well - but when I then move it into the text-window area, it doesn't change back to a normal pointer. Which is wroooooooong.

Any ideas why the pointer bitmap isn't being updated?

Answer 1

My first guess would be that you're intercepting the event that MDI uses to swap the pointer bitmap back out, without passing it up the chain.

Answer 2

Turns out I was incorrectly calling LoadCursor().

If you're using a predefined cursor, the first argument, the instance, must be NULL.

My argument was not NULL (and I wasn't checking the return value, cough!).