Retrieves the show state and the normal (restored), minimized, and maximized positions of a window.
Points to the WINDOWPLACEMENT structure that receives the show state and position information.
The flags member of the WINDOWPLACEMENT structure retrieved by this function is always 0. If CWnd is maximized, the showCmd member of WINDOWPLACEMENT is SW_SHOWMAXIMIZED. If the window is minimized, it is SW_SHOWMINIMIZED. It is SW_SHOWNORMAL otherwise.