how to detect when mouse leaves the window win32

Question

I am creating an application with the win32 api and I have a boolean isLeftClickPressed which is set to true when I receive a WM_LBUTTONDOWN message. when I receive a WM_LBUTTONUP message I set it to false. this works fine, however if I hold down the left mouse button and move my cursor out of the window and release my mouse, it never send a WM_LBUTTONUP message. I am not looking for a way to get around this rather just to find out when my mouse leaves the window and then set isLeftClickPressed to false.

any help would be appreciated.

Answer 1

Call TrackMouseEvent and check for WM_MOUSELEAVE