This function returns NULL when called for an MDI main frame window (CMDIFrameWnd). In an MDI application, the MDI main frame window does not have a view associated with it. Instead, each individual child window (CMDIChildWnd) has one or more associated views. The active view in an MDI application can be obtained by first finding the active MDI child window and then finding the active view for that child window.
this a sample about the VGA COLORBAR,the function of this code is show eight different colour in VGA,it s default installation is D:\RedLogic\RCII_samples, and the software environment is quatrusII 5.0,it is usefull for studying hardware.
