Hello Squeakers!
How do you "peek" into it a Squeak image like the one Scratch distributes, so to see and learn from the Scratch classes and methods etc. and "hack" (in the best sense of the word) it?
My understanding is that such an image is made "consumer friendly" (what's the term you use for doing things like what's described on http://squeak.preeminent.org/tut2007/html/205.html ?), so when the VM starts, it immediately shows that "application" only, right-clicks are overloaded, and one can not access e.g. a Browser, Workspace etc. development tools anymore, if they even are still part of this kind of images.
I am curious how Smalltalk/Squeak handles this issue that probably isn't new to many of you on the list. Can one either "load" (parts of) an image into a running "full/normal" image which has development tools, or can I add back those tools to such an image externally somehow? Surely that is not impossible, no image presumably can effectively completely "lock out" development, or can it?
Thanks a lot, Michael
Hi,
I'm a newbee playing around in Squeak for a while.
Sometimes I write code that is faulty, for example, execution gets into an infinite loop. If the loop doesn't stop after a while, the whole environment gets frozen and I have to kill Squeak in Windows XP. I have tried #forkAt (I put my stuff into a BlockClosure instance), it has solved the problem, but is there a way in Squeak to do this automatically? Can I execute something in Workspace that is put automatically into a low priority thread?
Thanks in advance for your kind answer.
Peter Mucsi
On Aug 5, 2007, at 10:03 AM, Peter Mucsi wrote:
Hi,
I'm a newbee playing around in Squeak for a while.
Sometimes I write code that is faulty, for example, execution gets into an infinite loop. If the loop doesn't stop after a while, the whole environment gets frozen and I have to kill Squeak in Windows XP. I have tried #forkAt (I put my stuff into a BlockClosure instance), it has solved the problem, but is there a way in Squeak to do this automatically? Can I execute something in Workspace that is put automatically into a low priority thread?
Hi Peter,
One thing you can do if you do get stuck in an infinite loop is to press alt-. (alt-period).* This will interrupt the currently executing thread. Squeak will bring up a walkback window which you can use as a debugger on the stopped thread, or just close to move on.
(I know this doesn't answer the question directly! You could make a Workspace that forked things off without too much work, although there isn't such a thing built in AFAIK. Check out #evaluateSelection in ParagraphEditor to see where workspaces, etc., evaluate code. Of course there are twisty parts: e.g., you'd then have to manage stopping processes that ran too long, since they would still run in the background and use up resources.)
Hope this helps, Benjamin Schroeder
* At least I think this is right. For me, on Mac, it's command- period, so I think it's alt-period on XP. It could be ctrl-period if not.
Hi Benjamin,
Alt-period worked well on Windows too. Basically all I wanted is not to lose my work if I do something silly.
Thanks a lot!
Regards, Peter
Benjamin Schroeder wrote:
On Aug 5, 2007, at 10:03 AM, Peter Mucsi wrote:
Hi,
I'm a newbee playing around in Squeak for a while.
Sometimes I write code that is faulty, for example, execution gets into an infinite loop. If the loop doesn't stop after a while, the whole environment gets frozen and I have to kill Squeak in Windows XP. I have tried #forkAt (I put my stuff into a BlockClosure instance), it has solved the problem, but is there a way in Squeak to do this automatically? Can I execute something in Workspace that is put automatically into a low priority thread?
Hi Peter,
One thing you can do if you do get stuck in an infinite loop is to press alt-. (alt-period).* This will interrupt the currently executing thread. Squeak will bring up a walkback window which you can use as a debugger on the stopped thread, or just close to move on.
(I know this doesn't answer the question directly! You could make a Workspace that forked things off without too much work, although there isn't such a thing built in AFAIK. Check out #evaluateSelection in ParagraphEditor to see where workspaces, etc., evaluate code. Of course there are twisty parts: e.g., you'd then have to manage stopping processes that ran too long, since they would still run in the background and use up resources.)
Hope this helps, Benjamin Schroeder
- At least I think this is right. For me, on Mac, it's command-period,
so I think it's alt-period on XP. It could be ctrl-period if not.
Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Michael Vorburger schrieb:
How do you "peek" into it a Squeak image like the one Scratch distributes, so to see and learn from the Scratch classes and methods etc. and "hack" (in the best sense of the word) it?
try to break something and get a debugger, this worked for me with beta-versions of scratch under linux in which the dev tools were not stripped out
- Jens -
beginners@lists.squeakfoundation.org
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Benjamin Schroeder -
Jens Lincke -
Michael Vorburger -
Peter Mucsi