Grab window content on OSX

Write a carbon or cocoa application (or produce a working piece of carbon or cocoa code) to grab window content from another application's window. The content grabbed should not include what is behind the window if it has some transparency. I've had trouble with this, you may have to find and use some undocumented API like CGSGetSharedWindow or another hack. I am open to suggestions! Suggestions: + Take a look at the apple "Grab" application - how does it work out window position and data for window capture? + Google for CGSWindow.h and investigate functions within + Have a look at the CGSGetSharedWindow function, could that work? CGSGetScreenRectForWindow? CreatePortForWindow? ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows? (depending on the nature? of the deliverables): a)? For web sites or? other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software? installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform MacOSX(10.3.4), (10.3.x) preferred