How to get stuff out of a GValue?

[Dan H <dunno stoptrick com>]

OK, I've got something in the form of a GValue (in this case, integer numeric data
obtained with gtk_container_child_get()), and I'd like to get access to the actual number inside. How is this 
done? I've looked into GValue's documentation, but all I see is stuff that deals only with GValues and no 
interface to the outside world of regular C types.

Any hints?

--D.