May 16 2008
As explained on the previous post, no doubt there is a means to capture a screenshot of the login screen, including all available user names. The question is, how to get there from here? Brett on the Cocoa developer mailing list provided a link to OpenGLScreenSnapshot, which is a Mac OS X application that demonstrates how to use OpenGL to grab a snaphost of the screen and save it to an image.
The example is an Xcode project which is easily imported and ran from with Xcode. The only problem is that the short example uses a menu to invoke the screencapture, so there is no means to logout and invoke the application.
I imagine the code change to make this an application that can be run from a terminal (at which point it could be run in the background using sleep) is trivial. However, problem is, I haven’t spent any time working with Xcode so it may take some time to figure this out.
Needless to say, it’s been an interesting challenge to try and capture the login screen. As I mentioned before, I think we’re 99% of the way there and if anyone can take the above example and make a command line version of the application, who knows, maybe that will bring this thing full circle.
It’s been a great diversion. So what’s the next challenge we can take on ?