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.
Nonzero if the function is successful; otherwise 0.
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.