Introduction - If you have any usage issues, please Google them yourself
The working principle of the menu and write applications, the menu command message in the MFC framework of Procedure of the class order and delivery process. Marking menu, the default menu implementation principle, the realization of graphics menu and often make mistakes in analysis, GetSystemMetrics application, fast way to achieve the pop-up menu and order response functions and effective range (pop-up menu with the specified parent window close relationship, the bottom sub-window has top priority and opportunities).