Screen capture - using Frame buffer from the application

Hi,
 
I am new to frame buffer concept.
Currently I need to capture the screen shot (print screen)  with my
application.
Is there any idea\code by which we can capture the screen from
application by using the frame buffer ?
 
Thanks,
Narendra


-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV