Changing ViewportMapping properties

[Tomás Aguado Gómez <tomas.aguado@xxxxxxxxxxxxxx>]

Hello everyone:
My project is now highly advanced, but I can't change the SoCamera 
ViewporMapping property. As SoCamera is an abstract class I don't tr to 
access this property doing an SoCamera casting, I access it like this:
    SoPerspectiveCamera *Camera:
          ...........
   if 
(Camera->ViewportMapping.getValue()==SoCamera::CROP_VIEWPORT_FILL_FRAME)
       {
            .........
       }

But the compiler complains:
  
     form1.ui.h:166: error: invalid use of `enum SoCamera::ViewportMapping'

¿How can I change/read the ViewportMapping property ?

Thanks in advance

Tomás Aguado Gómez

Grupo de Modelado y Realidad Virtual

http://dac.escet.urjc.es/investigacion/GMRV/