Beginners December 2009

beginners@lists.squeakfoundation.org

29 participants
28 discussions

Check wheater an instance of a class is actually there or not
by Hans Gruber 23 Dec '09

23 Dec '09

Hi Squeak Community! as mentioned above im am totally new in Squeak Programming and I found very good tips here already, thanks for that! Now to my question: How may I check wheater an instance of a class (in my case MyFileLibrary) has been created and exists at the time I check it. (MyFileLibrary = nil) is always false. I need this, because wenn an Instance of MyFileLibrary exists at the checking time, I want to proceed with an other method than I want to proceed with when an instance of MyFileLibrary does not exists. Can anybody help me? Regards. ___________________________________________________________ Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.! http://produkte.web.de/go/02/

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How to construct a PolygonMorph?
by Tim Rowe 22 Dec '09

22 Dec '09

I can see PolygonMorph Class>>vertices:color:borderWidth:borderColor: But I can't work out what it expects for vertices. Could somebody give me an example of how to create a PolygonMorph? (Or, better, tell me how to find things like this in the documentation, so I don't have to keep bothering you folks!) Thanks. -- Tim Rowe

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Re: [Newbies] [semi-OT] (fwd) Re: What Killed Smalltalk?
by Steve Wessels 22 Dec '09

22 Dec '09

That's right. Smalltalk hasn't died. I am fortunate enough to be part of a team developing financial software for many years using Smalltalk. People have predicted Smalltalk's death about as often as Apple's death. I think comparisons between Smalltalk and Java have to take marketing into account. Paying Smalltalk work is harder to find. Here's an interesting twist. Companies looking for skilled Object Oriented developers, if they understand what they need, will seek programmers with Smalltalk experience. - Steve On Nov 17, 2009, at 8:18 AM, Ralph Johnson <johnson(a)cs.uiuc.edu> wrote: Smalltalk didn't die. It's growth was killed. The dream of taking over the world was killed. But there are still people making their living with Smalltalk. It is hard to find good Smalltalk jobs, but they exist. I've always thought the main problem with Smalltalk was lack of marketing, in the broader sense. In 1995, when Java came out, there was no free Smalltalk that schools could use. I paid something like $3K per year for a site license for VisuaalWorks so I could teach with it, and few schools would do that. It was hard to find Smalltalk programmers, and their salaries were very high, and few schools taught it so companies would train their Cobol programmers in Smalltalk only to find them leaving for higher salaries. Smalltalk did not seem very well supported at all, and when the main Smalltalk company (ParcPlace) seemed to be taken over by dysfunctional pointy-haired managers, companies started to look for other alternatives. Java was their main choice, even though it was five years before it was good enough to build the same systems that they had been building in Smalltalk for a long time. Things like non-C-like syntax and difficulty of calling C libraries were a part of the problem, but a minor part. I think the bigger issues were business ones. As usual. Technical people think that technology wins or loses because of technical reasons, but they are usually wrong. if you want your technology to win, study marketing and business. I've been programming in Smalltalk since 1985. I remember 1995 as if it were yesterday. -Ralph Johnson _______________________________________________ Beginners mailing list Beginners(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners

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Bitmap-Arrays too large for "contents"
by Hans Gruber 22 Dec '09

22 Dec '09

> Hi Squeak-Fans! > > I am new in programming squeak an I have the following problem: > > I want to integrate bitmap-arrays in my project for the images used in it. To get the elements for my bit-map array I used: > > | image stream | > image := ColorForm fromFileNamed: > '/path/to/picture/icon.gif'. > stream := WriteStream with: String new. > image storeOn: stream. > stream contents. > > By inspecting contents I can copy & paste its elements to the corresponding methods for the image. The Problem now is, that some of my images generate more bitmap-code elements than "contents" can display. Do you have an Idea how may copy&paste all the elements of the Stream!? I tried Seaside WAFileLibrary and pasted the generated methods, but WAFileLibrary returns byte-arrays, which can't be interpretet within the squeak form of *Morph. > > So does anybody of you have an Idea and may help me? > > Thanks, > Regards. > >Your last line could become > > Clipboard clipboardText: stream contents > >However, the canonical way would be to simply generate the method rather than doing it manually. Generating a method can be as simple as > > MyClass compile: 'myMethod ^42' > >See, for example, MenuIcons>>importIconNamed:. > >- Bert - Hi Bert, thanks for your cool tip. I'll try to generate the methods via "class compile". I've tested it and a new problem came up. I did it the same way MenuIcons>>importIconNamed is implemented. The problem now is, that there comes up a error message ("MessageNotUnterstood(Metaclass)>>category") although I've inserted classfied : 'generated methods' and the category is already created and exists. Here the code snippet: generateMethodsForJPG: aString | writer image stream | writer := JPEGReadWriter on: (FileStream fileNamed: aString, '.jpg'). [ image := writer nextImage] ensure: [writer close]. stream := ReadWriteStream on: (String new). stream nextPutAll: aString ; cr. stream nextPutAll: (self methodStart: aString). image storeOn: stream. stream nextPutAll: self methodEnd. MyGraphicLibrary class compile: stream contents classified: 'generated methods' notifying: nil. ^ stream contents MyGraphicLibrary is a subclass of Object. The error comes up at "compile:[...]". Everything before that works fine. Form is created etc. Simply the compilation does not work. Do you have an Idea what the problem could be here ? Thanks for your help! ___________________________________________________________ Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.! http://produkte.web.de/go/02/

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Bitmap-Arrays to large for "contents"
by Hans Gruber 22 Dec '09

22 Dec '09

Hi Squeak-Fans! I am new in programming squeak an I have the following problem: I want to integrate bitmap-arrays in my project for the images used in it. To get the elements for my bit-map array I used: | image stream | image := ColorForm fromFileNamed: '/path/to/picture/icon.gif'. stream := WriteStream with: String new. image storeOn: stream. stream contents. By inspecting contents I can copy & paste its elements to the corresponding methods for the image. The Problem now is, that some of my images generate more bitmap-code elements than "contents" can display. Do you have an Idea how may copy&paste all the elements of the Stream!? I tried Seaside WAFileLibrary and pasted the generated methods, but WAFileLibrary returns byte-arrays, which can't be interpretet within the squeak form of *Morph. So does anybody of you have an Idea and may help me? Thanks, Regards. ______________________________________________________ GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! Jetzt freischalten unter http://movieflat.web.de

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Monticello - automatic publish new versions to Repo?
by LordGeoffrey 22 Dec '09

22 Dec '09

I created a project on squeaksource and made the repo available to monticello and published a (simple) package. No problems. That made me wonder how do i automatically/periodically update the published package on squeaksource ?

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Is there a Squeak idiom for array slices?
by Tim Rowe 18 Dec '09

18 Dec '09

If, for example, variable a contains an array with 20 elements, but I want to inject:into: just elements 3 through 17, is there an easier way than step-by-step creating a new array, copying the required elements of a into it, and then doing an inject:into: on that? TIA, -- Tim Rowe

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Getting the refactoring menu
by Tim Rowe 18 Dec '09

18 Dec '09

Smalltalk By Example says that I get a refactoring menu if I load the AST and RefactoringBrowser packages. I can't work out how to do that, though. I managed to find in the package universe browser, and have installed it, but I can't find the RefactoringBrowser package there. I can find it on SqueakSource, but I have no idea how to load it from there. Can anybody help? TIA, -- Tim Rowe

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File Question
by Overcomer Man 16 Dec '09

16 Dec '09

I have XY data I want displayed in a graphic window which I can print to compare with the drawing I manually entered it from before using it. I think I can handle the Pen class but I haven't any idea how to read the data in from a file. The FileStream class comment is obsolete in Cuis: To use the file system for most applications, you typically create a FileStream. This is done by sending a message to a FileDirectory (file:, oldFile:, newFile:, rename:newName:) which creates an instance of me. Accesses to the file are then done via my instance. FileDirectory file: 'c:/drill.txt' generates walkback as does oldFile:. The closest thing I found to something that works is FileStream readOnlyFileNamed: 'c:/drill.txt'. That inspected produces a StandardFileStream with nothing in its collection. A similar command in Croquet seems to show it looking at some subdirectory that I didn't specify which doesn't have the file. How does one correctly do basic file reading and writing? Thanks.

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Re: [Newbies] Expected menu items not there
by prwnkl 16 Dec '09

16 Dec '09

Tim, I have been at Squeak for only a couple of weeks but if you have a Mac with a one button mouse like I do you have to use AppleKey + Enter to "print". Good Luck Lance ----- Original Message ----- From: "Tim Rowe" <digitig(a)gmail.com> To: beginners(a)lists.squeakfoundation.org Sent: Wednesday, December 9, 2009 7:25:16 AM GMT -05:00 US/Canada Eastern Subject: Re: [Newbies] Expected menu items not there 2009/12/9 K. K. Subramaniam <subbukk(a)gmail.com>: > On Wednesday 09 December 2009 07:52:58 am Tim Rowe wrote: >> Can anybody work out what I've done, and what I need to do to get the print >> it and inspect it menu items back? > What you are seeing is the shift-yellow-click menu. You will see this if your > caps-lock got turned on accidentally. Hmm. No, caps-lock isn't on (as you can see!), and if I shift-yellow-click I get the following menu: explain pretty print pretty print with color file it in tiles from it spawn -- browse it senders of it implementors of it references to it -- selectors containing it method strings with it method source with it class names containing it class comments with it change sets with it -- save comments to file... send contents to printer printer setup -- special menu... more... So it looks as if there's something else going on. -- Tim Rowe _______________________________________________ Beginners mailing list Beginners(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners

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Beginners December 2009