Assuming you're looking for a screenshot (*), perhaps this will be of
assistance. Taken from my MeeGo Netbook. It will snapshot the current
state of the screen and (over)write it to file screenshot.png (in
pwd):
..................
meegolem-109-~> cat bin/screenshot
#!/bin/sh
export DISPLAY=:0.0
gst-launch-0.10 ximagesrc num-buffers=1 ! ffmpegcolorspace ! pngenc !
filesink location=screenshot.png
ls -l screenshot.png
........................

See also http://forum.meego.com/showpost.php?p=27827&postcount=3 ...
the fact that this little script works on MeeGo 1.2.0.90 Netbook,
MeeGo 1.2.0.90Tablet, my amazing new Harmattan N950 handset, my Fedora
desktops, etc is small sign of progress amidst a sea of turmoil...

Hopefully, with wayland coming, there's some reasonable replacement
for the 'ximagesrc num-buffers-1' part.

-- Niels
http://nielsmayer.com

PS: (*) alternately perhaps this is the kind of application snapshot
you're looking for :-) :
http://www.stanford.edu/~pgbovine/cde.html
http://www.youtube.com/watch?v=6XdwHo1BWwY
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