July 2020 - Pharo-users - lists.pharo.org

two String concatenation in pharo

by shawon58

As i got idea that *LibC system: 'D:\DEV_FreeCAD\build\bin\makebt.exe ', a asString* is worked but now i want to send two data like *LibC system: 'D:\DEV_FreeCAD\build\bin\makebt.exe ', a asString, b asString* but not worked can anyone have idea how to do it. Thanks <http://forum.world.st/file/t372453/a.png> -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 29, 2020

Re: [Pharo-users] Want to create a text Field using SPEC2 to get Value from User

by Tim Mackinnon

Hi - you will get the most benefit by working through the problem yourself which is why folks are hesitant to âdo it for youâ, as you wonât learn meaningfully that way. Have you tried putting a break point in the code and using the debugger? (You can use the code âself halt.â If you canât figure out breakpoints (but Iâm sure you can find docs on the debugger). Then see what the state of things are. Step into code and see what itâs doing. You can also evaluate expressions and get results to check things (if you canât figure that out - assign some temp variables). This is how you will learn how to help yourself, and it will make you more productive in the long run. Hope this helps, Tim > On 29 Jul 2020, at 04:44, shawon58 <shawonhoque58(a)gmail.com> wrote: > > ï»¿ > Hello KMO > i follow your step one by one and make the form but i want to run : > > connectPresenters > myButton whenActivatedDo: [LibC system: 'a.bat', myTextField asString]. > > That means when i put any value in text field than press click me than that > value need to send to my bat file as string. so i dont know is that ok or > not. but if i write: > > myButton whenActivatedDo: [LibC system: 'a.bat 10']. > > than its work perfectly but my concern is to get the value from text field > not the fixed value. > SO i think i am doing in the wrong things. Please help me with this issue. > > Thanks a lot > kmo wrote >> This code should give you a clue of how to do what you want. You can file >> it >> in or type it in yourself. You can run it from the playground with the >> command - >> >> SimpleExample new openWithSpec. >> >> How it works - You need to subclass SpPresenter. You need to set up an >> instance method called initializePresenters to create a text input and a >> button. You then create aninstance method called connectPresenters to put >> a >> handler on to the button. >> >> You need a class side method called defaultSpec to layout the button and >> the >> text input >> >> That's it. >> >> Note that you have to hit enter to register any change in the text field. >> You will need the transcript open to see the results in this example. >> >> Hope this helps >> >> SpPresenter subclass: #SimpleExample >> instanceVariableNames: 'myButton myTextField' >> classVariableNames: '' >> package: 'KMP-SimpleSpecExample'! >> >> !SimpleExample methodsFor: 'as yet unclassified' stamp: 'KMP 7/28/2020 >> 16:20'! >> initialize >> super initialize ! ! >> >> >> !SimpleExample methodsFor: 'initialization' stamp: 'KMP 7/28/2020 16:31'! >> initializePresenters >> myButton := self newButton . >> myButton label:'Click Me'. >> myTextField := self newTextInput. >> ! ! >> >> !SimpleExample methodsFor: 'initialization' stamp: 'KMP 7/28/2020 16:29'! >> connectPresenters >> "Put what you want to do when the button is clicked hhere" >> myButton whenActivatedDo: [ Transcript show: myTextField text].! ! >> >> "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "! >> >> SimpleExample class >> instanceVariableNames: ''! >> >> !SimpleExample class methodsFor: 'specs' stamp: 'KMP 7/28/2020 16:30'! >> defaultSpec >> >> ^ SpBoxLayout newVertical >> borderWidth: 10; >> spacing: 10; >> add: #myTextField expand: false; >> add: #myButton expand: false; >> yourself! ! >> >> >> >> >> >> -- >> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > > > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >

July 29, 2020

Re: [Pharo-users] Want to create a text Field using SPEC2 to get Value from User

by shawon58

Hello KMO i follow your step one by one and make the form but i want to run : connectPresenters myButton whenActivatedDo: [LibC system: 'a.bat', myTextField asString]. That means when i put any value in text field than press click me than that value need to send to my bat file as string. so i dont know is that ok or not. but if i write: myButton whenActivatedDo: [LibC system: 'a.bat 10']. than its work perfectly but my concern is to get the value from text field not the fixed value. SO i think i am doing in the wrong things. Please help me with this issue. Thanks a lot kmo wrote > This code should give you a clue of how to do what you want. You can file > it > in or type it in yourself. You can run it from the playground with the > command - > > SimpleExample new openWithSpec. > > How it works - You need to subclass SpPresenter. You need to set up an > instance method called initializePresenters to create a text input and a > button. You then create aninstance method called connectPresenters to put > a > handler on to the button. > > You need a class side method called defaultSpec to layout the button and > the > text input > > That's it. > > Note that you have to hit enter to register any change in the text field. > You will need the transcript open to see the results in this example. > > Hope this helps > > SpPresenter subclass: #SimpleExample > instanceVariableNames: 'myButton myTextField' > classVariableNames: '' > package: 'KMP-SimpleSpecExample'! > > !SimpleExample methodsFor: 'as yet unclassified' stamp: 'KMP 7/28/2020 > 16:20'! > initialize > super initialize ! ! > > > !SimpleExample methodsFor: 'initialization' stamp: 'KMP 7/28/2020 16:31'! > initializePresenters > myButton := self newButton . > myButton label:'Click Me'. > myTextField := self newTextInput. > ! ! > > !SimpleExample methodsFor: 'initialization' stamp: 'KMP 7/28/2020 16:29'! > connectPresenters > "Put what you want to do when the button is clicked hhere" > myButton whenActivatedDo: [ Transcript show: myTextField text].! ! > > "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "! > > SimpleExample class > instanceVariableNames: ''! > > !SimpleExample class methodsFor: 'specs' stamp: 'KMP 7/28/2020 16:30'! > defaultSpec > > ^ SpBoxLayout newVertical > borderWidth: 10; > spacing: 10; > add: #myTextField expand: false; > add: #myButton expand: false; > yourself! ! > > > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 29, 2020

Re: [Pharo-users] Intermediate-Level Tutorials for Pharo

by Russ Whaley

Back on the 'Intermediate Tutorials' question... I would love to see intermediate tutorials on Spec2 and Seaside.... and perhaps how to best adapt an (Sp)Application to serve both 'presenters' with guidelines on what responsibility goes where on the presenter/component, application, and model(s). What I found most useful in tutorials is specific examples. To me, generic examples can be too easily misunderstood - making them difficult to (re)apply. A specific example, even if silly, can really make a difference... i.e. I'm never going to create a GUI based on the Class/method hierarchy and I find it very difficult to apply those examples (although they are slick) to my application needs. I love looking at how other people approach problems, identify solutions (I can't wait to dig into the logic-puzzle code). This mailing list is great, but more - and more advanced - tutorials would be very much appreciated! Thanks! Russ On Mon, Jul 27, 2020 at 11:45 PM tbrunz <wild.ideas(a)gmail.com> wrote: > So I decided to write an application to solve the Zebra Puzzle, by solving > this type of problem in general. In Pharo, of course. > > I worked out a few basic algorithms for making deductions and inferences, > and coded them, along with tests, in Pharo 8. Now I've reached the point > of > having a working "proof of concept" or prototype. It can't (yet) solve the > Zebra Puzzle without some "human assistance", but it does keep track of the > solution state as it progresses, it handles the bookkeeping, makes the > basic > deductions/inferences, and produces reports. > > And I've used it to quickly solve the Zebra Puzzle. I coded the solution > as > a separate class/method, with extra rules inserted that I was able to infer > by iterating to partial solutions, so that it solves the entire thing. It > will interesting to develop the remaining algorithms, and it would be nice > to eventually create a nice, interactive user interface for it as well. > > Since I want to fashion this into an intermediate-level tutorial, I need > feedback on what I have so far. I don't want my inexperience to lead to me > teaching the wrong techniques, etc. to other developers who are learning > Pharo. What I have can no doubt be improved, but I need to hear from the > master craftsman in this community what parts are compromised and how (and > why) it can be made a better example of "how to program in Pharo" properly. > > If anyone has the time and is willing to help, the code (complete with > class > & method comments, test classes/methods, and the Zebra Puzzle example) is > here: > https://github.com/tbrunz/logic-puzzle and I'm available to answer > questions > about it, of course. > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > > -- Russ Whaley whaley.russ(a)gmail.com

July 29, 2020

Re: [Pharo-users] Class side vs instance side (variables and methods)

by Esteban Maringolo

Hi, The "class vs instance" side is one of the most confusing things for newcomers, I remember struggling with it when I learnt Smalltalk (and also was a novice in OOP). It helps you thinking it this way: the instance side is everything that will affect all instances of such class, and you can think the "class side" as what affect the factory for these instances (the sole instance of the class). E.g. let's say you have a "Dog". Dog instances will have a #bark method, and maybe a "color" property (via an instance variable). So when you do: dog1 := Dog new. dog1 color: Color white. dog2 := Dog new. dog2 color: Color black. You have two instances of Dog, and each one with its own color. Both understand the #bark message. But the Dog (capitalized) there, references the Dog class itself (aka "the class side" of Dog) and #new is a method of the "class side" of Dog. So if you implement a #newWhite method in the "class side" of Dog, it would be something like this. Dog class>>newWhite "Returns a new white instance of receiver." ^self new color: Color white In this method the "self new" refers to the class itself, not to the "instance" of the dog, but the returned object of "new" is an instance, and there the #color: message is sent to the instance of Dog. I hope this explanation helps, the meta relations involved in this are more complex than what I explained, but I hope this helps you get started. Regards! Esteban A. Maringolo On Tue, Jul 28, 2020 at 8:35 PM G B via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > Being new not only to Smalltalk, but OOP in general, I think I finally am understanding things. One area I am still unsure about is the class side versus the instance side. Does one usually use the class side when they want those inherited in every subclass, which frees one from having to declare them in every instance? > > TIA for reading my silly questions.

July 28, 2020

Re: [Pharo-users] Class side vs instance side (variables and methods)

by Richard Sargent

On Tue, Jul 28, 2020 at 4:35 PM G B via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > Being new not only to Smalltalk, but OOP in general, I think I finally am > understanding things. One area I am still unsure about is the class side > versus the instance side. Does one usually use the class side when they > want those inherited in every subclass, which frees one from having to > declare them in every instance? > One of the important concepts in Smalltalk is that *everything* is an object. When we say "class side" and "instance side", we are using a shorthand for the two objects involved. In most Smalltalks, the "class side" is really a meta-class and the "instance side" is really the class. The browser is designed to present them together because it makes sense to do that. Both sets of behaviours and variables are inherited by subclasses. [I'm playing a little loose here, as there is a distinction between a Class Variable and a Class Instance Variable in the meta-class.] The meta-class/"class side" typically deals with instance creation and management. The "instance side" provides the behaviours associated with the instances of the class. > TIA for reading my silly questions. > Not silly at all. This is a somewhat opaque topic since the browser makes it appear less obvious.

July 28, 2020

Class side vs instance side (variables and methods)

by G B

Being new not only to Smalltalk, but OOP in general, I think I finally am understanding things. One area I am still unsure about is the class side versus the instance side. Does one usually use the class side when they want those inherited in every subclass, which frees one from having to declare them in every instance? TIA for reading my silly questions.

July 28, 2020

Re: [Pharo-users] Want to create a text Field using SPEC2 to get Value from User

by kmo

This code should give you a clue of how to do what you want. You can file it in or type it in yourself. You can run it from the playground with the command - SimpleExample new openWithSpec. How it works - You need to subclass SpPresenter. You need to set up an instance method called initializePresenters to create a text input and a button. You then create aninstance method called connectPresenters to put a handler on to the button. You need a class side method called defaultSpec to layout the button and the text input That's it. Note that you have to hit enter to register any change in the text field. You will need the transcript open to see the results in this example. Hope this helps SpPresenter subclass: #SimpleExample instanceVariableNames: 'myButton myTextField' classVariableNames: '' package: 'KMP-SimpleSpecExample'! !SimpleExample methodsFor: 'as yet unclassified' stamp: 'KMP 7/28/2020 16:20'! initialize super initialize ! ! !SimpleExample methodsFor: 'initialization' stamp: 'KMP 7/28/2020 16:31'! initializePresenters myButton := self newButton . myButton label:'Click Me'. myTextField := self newTextInput. ! ! !SimpleExample methodsFor: 'initialization' stamp: 'KMP 7/28/2020 16:29'! connectPresenters "Put what you want to do when the button is clicked hhere" myButton whenActivatedDo: [ Transcript show: myTextField text].! ! "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "! SimpleExample class instanceVariableNames: ''! !SimpleExample class methodsFor: 'specs' stamp: 'KMP 7/28/2020 16:30'! defaultSpec ^ SpBoxLayout newVertical borderWidth: 10; spacing: 10; add: #myTextField expand: false; add: #myButton expand: false; yourself! ! -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 28, 2020

Want to create a text Field using SPEC2 to get Value from User

by shawon58

Hello Is there anyone who have idea how to create a textinputfield in spec2/GUI in pharo and get the value from that text field. Cause i want to use LibC fuction to send the text field data to a BAT file. So need help to create a simple textfield that can get the value. I need guide line badly. Thanks for your kind Help -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 28, 2020

Re: Fuel - FLSerializer tests are not working (pharo 8)

by Davide Varvello

Hi, I discovered why tests are failing. The reason is that Fuel is using root directory as working path instead of the working directory. Unfortunately the root dir is not writeable (of course) and so the failings. I guess the mistake occurs because since Pharo (7?) the File* and Stream* classes changed. Cheers Davide Pharo Smalltalk Users mailing list wrote > Hi Guys, > > There is something wrong with Fuel. > I got the version for Pharo 8 > > Metacello new > repository: 'github://theseion/Fuel:3.0.2/repository'; > baseline: 'Fuel'; > load. > > > But tests are red, all tests of FLBinaryFileStreamBasicSerializationTest > and > others > > Cheers > Davide > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 28, 2020