Smalltalk - How is created the Image file from Little Smalltalk?

Author

How is created the Image file from Little Smalltalk?

mfdavid@gmail.com

2007-10-24, 7:27 pm

Hail there.

Im a Java developer from Brazil, and I=B4m studying a little bit of
smalltalk now. It=B4s an amazing language and I=B4m really excited about
what can be done with it.

I always dreamed about creating my own language, a "perfect" language.
Well, I dont know much about the subject, but I do know a lot about
java and a little bit about how to write a compiler.

Well.. I was looking around when i found Little Smalltalk, the java
version (http://web.engr.oregonstate.edu/~budd/SmallWorld/
ReadMe.html). It=B4s kind simple, but it=B4s really

to play with it
and i would like to make a few modifications on it. I=B4m thinking about
writing a special smalltalk designed for simple 2D games in the
future, and I think this code might help me a lot.

My problem is: I was modifing the java source code of Little Smalltalk
and now it can=B4t load the Image file anymore. I get this error:
"received I/O exception java.io.InvalidClassException: SmallByteArray;
local class incompatible: stream classdesc serialVersionUID =3D
-5008653136016369974, local class serialVersionUID =3D
7026696644129987657 - Image filename: image"
On this line of code:
this.theInterpreter.nilObject =3D (SmallObject) ois.readObject();

I was not able to undestand what is exactly inside this Image file,
and how it was generated. Can I re-create it some how with the
modifications I made on the classes?

Thanks a lot,
Marcio F. Davod

Tim M

2007-10-25, 8:11 am

Hi Marcio

> I was not able to undestand what is exactly inside this Image file,
> and how it was generated. Can I re-create it some how with the
> modifications I made on the classes?

Someone might be able to tell you about Little Smalltalk but there was a
discussion on this group about how initial images are created (although not
specifically for Little Smalltalk) - maybe these will give you a clue (I
searched this group on google for "initial image")

http://groups.google.co.uk/group/co...6d82cf192ea7db1

http://groups.google.co.uk/group/co...87e5083dd3686bd

Also with regards to 2D gaming, someone in the Dolphin group has been writing
about creating gaming objects and about their approaches to frames per second
etc. See: http://learningtotalk.blogspot.com/atom.xml

Hope that helps,

Tim

andrewginmd@aol.com

2007-10-26, 4:32 am

..... i found Little Smalltalk, ... I was not able to undestand what is
exactly inside this Image file,
> and how it was generated. Can I re-create it some how with the
> modifications I made on the classes?...
Hi Marcio
For current info try www.littlesmalltalk.org, which links to current
versions of LittleSmalltalk, and link download the original book
in .pdf

Good luck,
ACG

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