How to remove the system menu from an iconized application in Visual C++

MORE INFORMATION

Method One

   BOOL CMainFrame::PreCreateWindow(CREATESTRUCT & cs)
   {
           // Call the base class version of PreCreateWindow, replace
          //  CMDIFrameWnd with CFrameWnd in the following line
          //  for an SDI application

           if (!CMDIFrameWnd::PreCreateWindow(cs))
                return FALSE;

          // Remove the system menu style bit from the window

           cs.style &= ~WS_SYSMENU;
           return TRUE;
   }
				

Method Two

1. Declare a BOOLEAN public data member in the class declaration of CMainFrame. This data member determines if the system menu is enabled or not:

         // In an SDI application CMainFrame will be derived from CFrameWnd
   
         class CMainFrame : public CMDIFrameWnd
         {
         public:
            BOOL sys_menu_enabled;
                .
                .  // Existing class declarations
                .
         }
   						

2. Modify the CMainFrame constructor to initialize the sys_menu_enabled data member function to TRUE:

         CMainFrame::CMainFrame()
         {
           //default the system menu to be enabled
           sys_menu_enabled = TRUE;
                .
                .  // Continue with normal constructor code, if any
                .
         }
   						

3. Create a message handler for the WM_SIZE message for the CMainFrame class, and add the following code to the CMainFrame::OnSize message handler:

         void CMainFrame::OnSize(UINT nType, int cx, int cy)
         {
           // declare a local variable to hold the window style
   
              long window_style;
   
           //call base class's OnSize function,
           //If SDI application call CFrameWnd::OnSize()
   
           CMDIFrameWnd::OnSize(nType, cx, cy);
   
           //if user is minimizing or iconizing the application
   
           if (nType == SIZE_MINIMIZED)
           {
                // Get the main frame window's style
                 window_style = GetWindowLong(m_hWnd, GWL_STYLE);
   
                //Remove the system menu from the window's style
                 window_style &= ~WS_SYSMENU;
   
                //toggle the boolean data member to show sys menu disabled
                 sys_menu_enabled = FALSE;
   
                //set the style attribute of the main frame window
                SetWindowLong(m_hWnd, GWL_STYLE, window_style);
           }
           else
           {
                //if user is restoring the application and his system menu
                //is disabled,
                if ((nType == SIZE_RESTORED) || nType == SIZE_MAXIMIZED) &&
                   (!sys_menu_enabled))
                {
                    window_style = GetWindowLong(m_hWnd, GWL_STYLE);
   
                  //Add the system menu to the window's style
                    window_style |= WS_SYSMENU;
   
                 //toggle the boolean data member to show sys menu enabled
                   sys_menu_enabled = TRUE;
   
                   SetWindowLong(m_hWnd, GWL_STYLE, window_style);
                   SendMessage(WM_NCACTIVATE,TRUE);
                }
            }
         }