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Screen Dump To Gif
GIFReadWriter putForm: Display onFileNamed: 'screenshot.GIF'
You need the fixes from Hans Martin Mosner to get the GIFReadWriter to work in 1.23 or earlier.
Purpose: The GIFReadWriter class can encode and decode GIF images to Squeak's internal Form format. putForm:onFileNamed: takes a Form and encodes a GIF from it.
Why This is Interesting: The whole Display is just a Form, actually, it's a DisplayScreen, which is a subclass of Form. You can send the whole thing to GIF, or just a window, or something cool that you draw.
In 2.7 there is:
Utilities grabScreenAndSaveOnDisk