store "*.gif" file in Squeak
ned at squeakland.org
Thu Jan 8 04:32:32 UTC 2004
On Wednesday 07 January 2004 6:12 pm, ye juan wrote:
> Who knows how to store a picture ("*.gif" file)into
> (1) A "*.gif" file belongs to which class;
A String naming a GIF file can be opened as a FileStream.
The GIF data can be *read from* a FileStream.
The GIF data from the FileStream can be *used to create* a Form.
The Form can be *written to* a FileStream.
> (2) How to represent it and its other information,
> such as the date when it is produced, the author who
> creates it;
> (3) how to read it in other applications in Squeak.
> If you have similar demo, please send to me!
How to find out the answer to this and other questions in Squeak:
* use the browser, and search for classes with gif in their names:
we find AnimatedGIFReadWriter and GIFReadWriter
* use the Message Names tool, and search for methods with gif in their names:
Look at the class side methods in GIFReadWriter and ImageReadWriter, its
We see that we can say:
GIFReadWriter formFromFileNamed: 'myFile.gif'
which returns a Form (try it in a Workspace, and then inspect the result).
GIFReadWriter putForm: someForm onFileNamed: 'anotherFile.gif'.
which saves a Form to a file.
Now you can browse the Form class to see what you can do with them.
One thing that I do all the time to see if things are working is to say:
which will make an ImageMorph with the form.
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