◄CWnd►                                        ◄Up► ◄Contents► ◄Index► ◄Back►
──Microsoft Foundation Classes──────────────────────────────────────────────
 
  afx_msg void OnSysCommand( UINT  nID, LONG  lParam  );
 
  Parameter   Description
 
  <nID>       Specifies the type of system command requested. This
              parameter can be one of the following values:
 
              Value                      Description
 
              SC_CLOSE                   Close CWnd.
 
              SC_HOTKEY                  Activate the CWnd associated with
                                         the application-specified hot
                                         key.
 
              SC_HSCROLL                 Scroll horizontally.
 
              SC_KEYMENU                 Retrieve a menu through a
                                         keystroke.
 
              SC_MAXIMIZE (or SC_ZOOM)   Maximize CWnd.
 
              SC_MINIMIZE (or SC_ICON)   Minimize CWnd.
 
              SC_MOUSEMENU               Retrieve a menu through a mouse
                                         click.
 
              SC_MOVE                    Move CWnd.
 
              SC_NEXTWINDOW              Move to the next window.
 
              SC_PREVWINDOW              Move to the previous window.
 
              SC_RESTORE                 Checkpoint (save the previous
                                         coordinates).
 
              SC_SCREENSAVE              Executes the screen-save
                                         application specified in the
                                         Desktop section of the Control
                                         Panel.
 
              SC_SIZE                    Size CWnd.
 
              SC_TASKLIST                Executes or activates the CWnd
                                         Task Manager application.
 
              SC_VSCROLL                 Scroll vertically.
 
  <lParam>    Contains the cursor coordinates if a Control-menu command is
              chosen with the mouse. The low-order word contains the
              x-coordinate, and the high-order word contains the
              y-coordinate. Otherwise, this parameter is not used.
 
  Remarks
 
  Called when the user selects a command from the Control menu or when the
  user selects the Maximize or Minimize button.
 
  This message-handler member function calls the ◄Default► member
  function. Override this member function in your derived class to handle
  the ◄WM_SYSCOMMAND► message.
 
  By default, OnSysCommand carries out the Control-menu request for the
  predefined actions specified above.
 
  Applications that modify the Control menu must process WM_SYSCOMMAND
  messages, and any WM_SYSCOMMAND messages not handled by the application
  must be passed on to OnSysCommand. Any command values added by an
  application must be processed by the application and cannot be passed to
  OnSysCommand.
 
  An application can carry out any system command at any time by passing a
  WM_SYSCOMMAND message to OnSysCommand.
 
  Access (sometimes called "accelerator") keystrokes that are defined to
  select items from the Control menu are translated into OnSysCommand
  calls; all other access keystrokes are translated into ◄WM_COMMAND►
  messages.
 
  See Also
 
  ◄CWnd::Default►, ◄WM_SYSCOMMAND►
 
 
                                     -♦-