Question

In WinAPI is there a mouse move notification for the full desktop (full screen) and not for a window only?

I would like to receive mouse screen coordinates in my main window procedure.

Edit:

What I try to do is getting the coordinates from the mouse when dragging from a button in my window to outside that window.

Answer 1

Not as such, no. If you wanted to do something anywhere on the desktop from within your program, e.g. point somewhere or draw something anywhere, you could capture the mouse and then follow the movement until the mouse button is released. See SetCapture for this.

For an example, see this article on MSDN: Drawing Lines with the Mouse

Otherwise you can always use Windows hooks to follow mouse movements anywhere.