Beginners May 2006

beginners@lists.squeakfoundation.org

65 participants
84 discussions

Re: Thanks for the offer of assistance
by David Shaffer 16 May '06

16 May '06

Charles, Ah, I see the problem. In version 2: The idea behind CrLfFileStream is to hide (or make uniform) the various line end convensions. So, no matter what line end convension your file uses (MAC = CR, UNIX = LF and WINDOWS=CRLF) you will see a carriage return. If you really want the literal bytes of the file there is little reason to use CrLfFileStream. The following code works (notice that in Smalltalk you normally send ascii to a stream if you want any special processing (like lf->cr conversion to be done): stream := CrLfFileStream oldFileNamed: '/home/shaffer/technologies.csv'. stream ascii. "Tell CrLfFileStream to look for the EOL convension and convert lf->cr if needed" lines := 0. [stream atEnd] whileFalse: [Transcript show: stream nextLine; cr. lines := lines + 1]. stream close. Transcript show: lines printString , ' line processed.' In version 1: You are using #nextLine which looks for a carriage return but your file has line feeds (look at the implementation of it in PositionableStream). The solution interpreting the bytes literally would be to use stream upTo: Character lf Here's a sample: stream := FileStream oldFileNamed: '/home/shaffer/technologies.csv'. lines := 0. [stream atEnd] whileFalse: [Transcript show: (stream upTo: Character lf); cr. lines := lines + 1]. stream close. Transcript show: lines printString , ' line processed.' Now, your question might be "Which is better?". The utility in CrLfFileStream comes when you might get files with either convention. That is, when you want the same code to be able to process CR, LF and CRLF line-terminated files. If you have no need for the flexibility then I'd stick with the second version (the one which uses FileStream). I hope that helps... David

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Breakpoints in Squeak's debugger
by Rich 16 May '06

16 May '06

I've been playing around with Squeak's debugger, and I was wondering how you set breakpoints (or if you can set breakpoints)? Thanks you. -Rich

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opening tools with buttons
by Chris Kassopulo 16 May '06

16 May '06

Greetings, Using the SimpleButtonMorph class I can create a button that opens something like so: MySimpleButtonMorph new send: #open to: Transcript; label: 'Transcript'; openInHand. send: #open to: Transcript send: #open to: Workspace send: #open to: ProcessBrowser send: #open to: Celeste send: #open to: Scamper send: #openBrowser to: PackagePaneBrowser send: #openBrowser to: Browser "System Browser" all work. How do I get at the other items in the Tools flap? Thanks, Chris

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A morph tutorial
by Davide Arrigo 15 May '06

15 May '06

Hi all I'm an Italian newbie. I had some great difficult in morph programming, there's not enough documents on it and I don't understand how to build a simple user interface in Squeak. Is There somewhere a complete tutorial (or a book to buy) with some example to begin to get out simple UI? MAny Thanks. -- --------------- Davide Arrigo

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[Q] How to get the source code of eToy created
by Young-Jin Lee 15 May '06

15 May '06

Hi, I am a real novice Squeaker and have a question of how to get the code of an eToy I created (or generally source code of morph projects). I know how to save the eToy project into *.pr file, but it is not readable file. As an experienced Java programmer, I want to see what's created from the visual programming of eToy and other morph projects. Thanks in advance. Young-Jin Lee

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new VM for win32
by Waldemar Dick 15 May '06

15 May '06

Hi, is there somewhere a newer VM build for win32. Right now, a lot of (all?) FloatMathPluginTests fail with with the Squeak-Win32-3.7.1-VM, due to 'primitiveFailed'. Thanks a lot. Waldemar Dick

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[Refreshing Read] Schizoid Classes - Of class, type, and method
by Klaus D. Witzel 14 May '06

14 May '06

List, have a look at this dissection (a minute and critical analysis) done by Rodney Bates, Wichita State University, in ACM Queue vol. 2, no. 6 - September 2004: - http://acmqueue.com/modules.php?name=Content&pa=showpage&pid=205 Enjoy! /Klaus

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Good squeak based Smalltalk tutorials.
by mike.vidal＠gmail.com 13 May '06

13 May '06

I'm looking for some tutorials. The http://www.squeak.org/Documentation/ page has a few but are there some other ones that folks like?

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JPEGReadWriter2
by Waldemar Dick 13 May '06

13 May '06

Hi, I'm using JPEGReadWriter2 which comment says: "... I require the VM plugin JPEGReadWriter2Plugin, which is typically stored in same directory as the Squeak virtual machine." I'm using Squeak3.8-current-win-full.zip and there is no "plugin" in the squeak VM directory. JPEGReadWriter2 still works and I'm wondering, if: - Is the plugin compiled into the squeak vm? But 'Smalltalk listLoadedModules' results in: #('SocketPlugin 23 September 2004 (i)' 'LargeIntegers v1.3 23 September 2004 (i)' 'Matrix2x3Plugin 23 September 2004 (i)' 'FloatArrayPlugin 23 September 2004 (i)' 'BitBltPlugin 23 September 2004 (i)' 'B2DPlugin 23 September 2004 (i)' 'SecurityPlugin 23 September 2004 (i)' 'FilePlugin 23 September 2004 (i)' 'MiscPrimitivePlugin 23 September 2004 (i)') There is no JPEGReadWriter2Plugin. - JPEGReadWriter2 doesn't actually use the plugin and has a fallback implementation to JPEGReadWriter? - Where do I find plugins? Thank you very much to clearify this. Greeting Waldemar Dick

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Why #method? WAS "Re: [Newbies] Multiple constructors"
by Bob Erb 13 May '06

13 May '06

Here's a question I feel comfortable asking on the Newbies list. :-) What's the hash mark signify when used as a prefix to a method name, as in the snippet below? On 5/12/06, Ralph Johnson <johnson(a)cs.uiuc.edu> wrote: > > Because instance creation methods are just methods (but on the class, > instead of on the instance), you can define as many as you want. Look > at class Date. There is #today, #tomorrow, #yesterday, #newDay:year:, > #newDay:month:year:, #year:day: #year:month:day: > - Bob Erb

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