how do I get the window cursor position

Question

This successfully retrieves the screen coordinates but I would like it to display coordinates relative to a particular window that is being moused over:

POINT p;
                if (GetCursorPos(&p))
                {
                    std::cout << p.x << "," << p.y << std::endl;
                    //cursor position now in p.x and p.y
                }

Can I modify the code to do that?

Answer 1

Yes, that's exactly what ScreenToClient does:

if (not ScreenToClient(window, &p)) { /* handle error */ }

If this is your own window, you'll also be receiving WM_MOUSEMOVE messages that you can use to keep track of the cursor position and won't need to poll for it. Depending what you want this for, there's even WM_MOUSEHOVER.