Beginners January 2007

beginners@lists.squeakfoundation.org

71 participants
70 discussions

Does anyone offer a squeak training course?
by andy.burnett＠knowinnovation.com 24 Jan '07

24 Jan '07

I sometimes find it easier to actually go on a training course than trying to work through text books. Does anyone offer such a course? Thanks AB

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SqueakMap account confirmation
by Rainer Keller 23 Jan '07

23 Jan '07

Hello friendly Squeakers! I am new to this list and going through the wealth of information on the squeak wiki at the moment. As Squeak always asks for a user name when I make changes I went ahead and registered myself on SqueakMap with the userid 'rke'. But I can't log in: When I try I get a message that my first log in should be done with a link in the confirmation email, but I have not received one (or it got eliminated by some spam filter). And I can't re-register because the syste tells me that my userid is already in use. Could someone please tell me who I should contact to get a resend of that confirmation email? Best regards and thanks in advance! Rainer Keller

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Problem printing from Workspace to Transcript
by Harry Mueller 22 Jan '07

22 Jan '07

I've just started looking at Squeak and can't seem to print to Transcript. I'm wondering if I'm doing it properly. I've written, Transcript show: 'Hello world!' into the Workspace window but nothing shows up in the open Transcript window. What am I doing wrong? Thanks, Harry

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Re: [Newbies] terminate event?
by abdu chadili 22 Jan '07

22 Jan '07

Or x := Object new. x toFinalizeSend: #show: to: Transcript with: 'He''s dead, Jim!\' withCRs. Utilities finalize. x:=nil. will display the message to the transcript immediately. ----- Original Message ---- From: David Urquhart <david.urquhart(a)hotmail.com> To: beginners(a)lists.squeakfoundation.org Sent: Sunday, January 21, 2007 9:42:16 PM Subject: Re: [Newbies] terminate event? Thanks for a fantastic answer and sample code. -Dave >From: Bert Freudenberg <bert(a)freudenbergs.de> >Reply-To: "A friendly place to get answers to even the most basic >questionsabout Squeak." <beginners(a)lists.squeakfoundation.org> >To: "A friendly place to get answers to even the most basic questions >aboutSqueak." <beginners(a)lists.squeakfoundation.org> >Subject: Re: [Newbies] terminate event? >Date: Sun, 21 Jan 2007 15:48:08 +0100 (MET) > > >Am Jan 21, 2007 um 15:21 schrieb Bert Freudenberg: > >>Am Jan 21, 2007 um 14:07 schrieb David Urquhart: >> >>>Hi >>> >>>I'm a Squeak beginner. I want to write to the transcript when an object >>>is coming to life and when its terminating. I have an initialize method >>>for the birth - what is the method called that fires at death? >> >>There is no such method. A message can be send to an object only if there >>is a reference to it. As long as a reference to an object exists, it is >>not dead, it does only get garbage-collected when the last reference is >>removed. >> >>About the only thing you can do is to register a *different* object to be >>notified when one object is garbage-collected. This is called >>"finalization". > >Here's an example. Evaluate this in a workspace: > > x := Object new. > x toFinalizeSend: #show: to: Transcript with: 'He''s dead, Jim!\' withCRs > >Nothing should happen. Then do > > x := nil > >which should print "was finalized" immediately. This is because x still >holds onto a relatively "new" object, which gets freed very fast. > >However, once an object gets "old" it takes until the next full garbage >collection (GC)! Create your object again, but this time, do this: > > Smalltalk garbageCollect. > x := nil. > >Nothing will be printed, because the GC reclaims all space, but also marks >all surviving objects as "old". So even though after assigning nil to x >your object is dead, the finalizer does not know it, yet. Only if you >trigger a full GC again, the object's space is reclaimed, and the >finalizer is activated. > >- Bert - > > >_______________________________________________ >Beginners mailing list >Beginners(a)lists.squeakfoundation.org >http://lists.squeakfoundation.org/mailman/listinfo/beginners _______________________________________________ Beginners mailing list Beginners(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners

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terminate event?
by David Urquhart 22 Jan '07

22 Jan '07

Hi I'm a Squeak beginner. I want to write to the transcript when an object is coming to life and when its terminating. I have an initialize method for the birth - what is the method called that fires at death? And this leads to two other questions... - What is the sequence of events that occur when I create a visible object like a morph - ie when does onDraw occur exactly? - What's the best way for me to answer these sorts of questions for myself? By the way I want to slip in a thanks to the Squeak developers and community - tuning into Squeak and smalltalk has refired my inspiration to create software. Dave

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Binaural Beats w/ Squeak
by Michael Gorsuch 21 Jan '07

21 Jan '07

I'm still rather new to Squeak, so I decided to start working on a small sound project. I want to produce Binaural Beats, which ultimately means that I need to be able to produce sounds at a certain frequency for a given length of time. it's more complicated than that, but I'm trying to find just this starting point. Can anyone offer some kind instructions for playing a specific tone through my system's audio card? Thank you, Michael

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Rome (Cairo) installation problems
by Sebasstian Nozzi 21 Jan '07

21 Jan '07

Hi all, I'm trying to use cairo in squeak (I'm actually trying this in croquet 1.0 beta, since I had read that rome needs tweak and the tweak server is down). So far I could load and install: - Rome-Base-JMM.17.mcz - Rome-Balloon-jl.46.mcz - Rome-PluginCanvas-JMM.41.mcz No problems with that. Now I wanted to load the demo (Rome-Demo-bf.32.mcz), and I get: Error: subscript is out of bounds: 0 (I don't know how to transcript the whole stack) So I thought I might be missing components, but trying to load Rome-Plugin-be.33.mcz and Rome-FontManager-JMM.54.mcz also trigger errors when loading the mcz files. I'm running on Windows XP and I installed the GTK+ runtime from http://gladewin32.sourceforge.net/ (which according to the cairo page includes cairo). I tried all the same in squeak 3.8 with tha same results. Am I missing something? Any ideas? Thanks in advance, Sebastian

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Squeak Workspace stuck in walkback
by Brent McConnell 21 Jan '07

21 Jan '07

I am new to Smalltalk and Squeak and am having some trouble using the 3.8.1version of the Squeak Workspace. I originally wrote the following: x := OrderedCollection new. x add: 'blue'. x do: [:a | Transcript show: a; cr] This works fine. I then changed it to this: x := Collection new. x add: 'blue'. x do: [:a | Transcript show: a; cr] Which produced an error on Collcetion>>add: as a subclass Responsibility which seems correct. But when I change it back to OrderedCollection I get an error that Collection>>do: is subclass responsibility. However this is EXACTLY the same code as before that worked. But now I have to exit the Workspace and start another before the code works again. Am I doing something wrong? Brent

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Re: [Newbies] FW: Problem printing from Workspace to Transcript
by Frank Urbach 19 Jan '07

19 Jan '07

Hi Harry, What did you after writing this into the workspace? You have two possibilities to complete this line: 1. Bring the cursor in the written line and use the right mouse button an select "Do-It". 2. Bring the cursor in the written line and press the keys cmd+d. In both of this cases the Transcript window should show "Hello World!". HTH Frank Original Message processed by David InfoCenter Subject: [Newbies] FW: Problem printing from Workspace to Transcript (19-Jan-2007 16:18) From: Harry Mueller <hgmueller(a)mts.net> To: frank.urbach(a)schmees.com I've just started looking at Squeak and can't seem to print to Transcript. I'm wondering if I'm doing it properly. I've written, Transcript show: 'Hello world!' into the Workspace window but nothing shows up in the open Transcript window . What am I doing wrong? Thanks, Harry

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FW: Problem printing from Workspace to Transcript
by Harry Mueller 19 Jan '07

19 Jan '07

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Beginners January 2007