Re: Converting a Glib::ValueBase to a derived type

[José Alburquerque <jaalburquerque cox net>]

Murray Cumming wrote:
> On Wed, 2008-01-30 at 15:33 -0500, José Alburquerque wrote:
>    
>   
> > > I'm looking at the todo comments in lines 65 and 71 of the structure.hg 
> > > file (in gstreamermm).  I'm attempting to define the getter methods of 
> > > the Gst::Structure along with the id_get_value() method
> > >       
>
> This one should be quite easy.
>
>   
> >  (commented 
> >     
> > > definition) correctly.
> > >
> > >   
> > >       
> > More specifically, I modified the StructureValueProxy
> >     
>
> This seems to be a way to return two pieces of information (the value
> and its name) in the return value. I don't think it will be possible to
> do that. It's not that important to have an operator[].
>
>   
> >  class defined in 
> > structure.hg to use Glib::ValueBase (just checked in to svn).  I'm still 
> > a bit unclear about working with Glib::ValueBase so I wrote the attached 
> > test (also checked in). I'm stuck in the last if block where I'm trying 
> > to determine if the value obtained is of the right type.
> >     
>
> You can try
> G_VALUE_TYPE(value.gobj()):
> http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#G-VALUE-TYPE:CAPS
>
>   
Last question:  Once the type is determined, is it practical to attempt 
to read the value stored?  If so, how would that be done?

-Jose