Screen grab underneath a window

[Colin Law <Colin_Law btopenworld com>]

Hi,

Im trying to grab an image of the desktop including other windows as 
would appear underneath my newly created window, a kind of 
pseudo-transparent window. Im not aiming for a transparent window, i 
actually want the image data. I also want to be able to re-capture the 
image after moving or resizing the window. The obvious problem here is 
that when i grab the image using gdk_pixbuf_get_from_drawable and using 
the root window for the source, my top level window is in the way.

Any suggestions?

The best ive come up with is some kind of unmapping the window, capture 
the image, then remap the window, but this messes with my expose event, 
and really isn't very nice.

thanks for any help
~Colin.