July 2014 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Using FFI

by ClÃ©ment Bera

Hello, This bug happen both with the old and new compiler. The error tells you that the number of arguments of your smalltalk method does not match the number of argument of the C method you want to call (but it seemsthe number of arguments is correct). This works fine: <apicall: int 'gst_init_check' (int char* int) module: ' libgstreamer1.0-0.so'> ^self externalCallFailed This works fine too: <apicall: int 'gst_init_check' (int* char* int*) module: ' libgstreamer1.0-0.so'> ^self externalCallFailed So it seems the bug comes from the parser missparsing ** . I am not familiar with C enough to help, I don't know what means ** (Is it a pointer pointing to a pointer pointing to the actual data ?). Perhaps someone who knows how to use FFI can give a better answer. Esteban ? Guille ? 2014-07-09 16:39 GMT+02:00 Annick Fron <info(a)afceurope.com>: > Hi, > I am trying to use FFI on linux with pharo 3 using version 31 of FFI. > I have written the following method : > <apicall: int 'gst_init_check' (int* char** int*) module: ' > libgstreamer1.0-0.so'> > > ^self externalCallFailed > > ==== > > but when accepting it I get a syntax error Â« matching number of arguments Â» > Annick Fron >

July 9, 2014

Re: [Pharo-users] [Article] Elegant Pharo Code

by Buddha Buck

On Wed, Jul 9, 2014 at 10:13 AM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > I don't know how this could be useful besides doing many things: "Split > a string on dashes, reverse the order of the elements and join them using > slashes". If you could find a example with some real application would be > nice too. > > Yes indeed, it does not make enough sense. Any ideas ? There are probably better ways to do it (using true date objects) but converting ISO date strings to US or EU date strings (yyyy-mm-dd to mm-dd-yyyy or dd-mm-yyyy) is almost "Split a string on dashes, rearrange the order of the elements and join them using slashes."

July 9, 2014

Re: [Pharo-users] [Article] Elegant Pharo Code

by Nicolai Hess

2014-07-09 16:13 GMT+02:00 Sven Van Caekenberghe <sven(a)stfx.eu>: > Hi HernÃ¡n, > > On 09 Jul 2014, at 09:11, HernÃ¡n Morales Durand <hernan.morales(a)gmail.com> > wrote: > > > Hello Sven, > > > > I will try to give some feedback for you. > > It is good to talk about the contents, the essence. > > > My major issue is that the objects you use are pretty basic. There is no > reason to put limits with so many contributed packages. > > Well, I tried to stick with stock Pharo (except for the very last example > that needs JSON parsing). Yes, some examples make little sense, but they > each do show something powerful, something that is missing in many > languages. > > I was kind of hoping to get some discussion going with people submitting > their favourites/alternatives, so that the list of examples could be > improved/extended. But I am a hard judge ;-) > > > Visualizations have impact and you could use Roassal, GraphViz, > CodeCity, GraphET. SQL is also of interest for many developers. Or Big Data > which is a requirement now. An example with Spec and DynamicLayout would be > cool. For reverse engineering there is Moose and you could show an overview > pyramid maybe? A one-liner with #linesOfCode would be magic :) > > Like others said, there could/should be other articles doing something > similar (giving a couple of cool examples as an overview/introduction), > focused on the areas/libraries/frameworks you mention. Please feel inspired. > > > About the article: When writing sample code with random, don't forget to > add a paragraph explaining the random source. It is /dev/urandom? To > randomize a String I write this: > > > > (UUID new asString reject: #isDigit) copyWithoutAll: '-'. > > Talking about the random source would lead a bit far, no ? > I don't like your random string example, it is too contrived. > The one I used is not perfect either, I would probably write it myself as > > String > new: 256 > streamContents: [ :string | > 256 timesRepeat: [ string nextPut: 'abcdef' atRandom ] ]. > > But having to write 256 twice is not cool, hence the my other choice. > > > To count digits (doesn't work for 1 digit but I like it): > > > > 42 factorial log ceiling. > > That is cool indeed. > > What I wanted to show is that, not only are Pharo numbers real objects > that can be mixed freely, without thinking about them, but that they are > more than that: real normal objects that you can add lots of useful methods > too. > > > I don't know how this could be useful besides doing many things: "Split > a string on dashes, reverse the order of the elements and join them using > slashes". If you could find a example with some real application would be > nice too. > > Yes indeed, it does not make enough sense. Any ideas ? > split - reverse - join $: join: ($: split:'0A:0B:0C:0D' ) reverse. convert hex address host/network. Btw, do we have a single message like split, but split at every nt element? 3 split '123456789' -> '123' '456' '789' > > > For Collection messages people is often interested in speed comparisons. > Because audience already knows how to do that in R, Python or other > language. > > Speed is not the subject of the article. Sure, some operations can > certainly be done in some other languages but certainly not in all of them, > out of the box. I would really like to see the standard deviation one (17) > done in other languages, for example. > > > Hope you could find them useful. > > Yes ;-) > > Sven > > > HernÃ¡n > > > > > > > > > > 2014-07-07 19:21 GMT-03:00 Sven Van Caekenberghe <sven(a)stfx.eu>: > > Hi, > > > > I have written a new article presenting Pharo using a list of 23 short > examples. > > > > Elegant Pharo Code > > > > Beautiful & Powerful One-liners, Expressions and Snippets > > > > https://medium.com/@svenvc/elegant-pharo-code-bb590f0856d0 > > > > As mentioned at the end of the article, I welcome feedback, remarks, > comments, alternative solutions and other examples. The idea is to create > yet another way to lure people into exploring Pharo while explaining by > example why we like Pharo. > > > > Enjoy! > > > > Sven > > > > -- > > Sven Van Caekenberghe > > Proudly supporting Pharo > > http://pharo.org > > http://association.pharo.org > > http://consortium.pharo.org > > > > > > > > > > > > > > >

July 9, 2014

Using FFI

by Annick Fron

Hi, I am trying to use FFI on linux with pharo 3 using version 31 of FFI. I have written the following method : <apicall: int 'gst_init_check' (int* char** int*) module: 'libgstreamer1.0-0.so'> ^self externalCallFailed ==== but when accepting it I get a syntax error Â« matching number of arguments Â» Annick Fron

July 9, 2014

Re: [Pharo-users] [Article] Elegant Pharo Code

by Sven Van Caekenberghe

Hi HernÃ¡n, On 09 Jul 2014, at 09:11, HernÃ¡n Morales Durand <hernan.morales(a)gmail.com> wrote: > Hello Sven, > > I will try to give some feedback for you. It is good to talk about the contents, the essence. > My major issue is that the objects you use are pretty basic. There is no reason to put limits with so many contributed packages. Well, I tried to stick with stock Pharo (except for the very last example that needs JSON parsing). Yes, some examples make little sense, but they each do show something powerful, something that is missing in many languages. I was kind of hoping to get some discussion going with people submitting their favourites/alternatives, so that the list of examples could be improved/extended. But I am a hard judge ;-) > Visualizations have impact and you could use Roassal, GraphViz, CodeCity, GraphET. SQL is also of interest for many developers. Or Big Data which is a requirement now. An example with Spec and DynamicLayout would be cool. For reverse engineering there is Moose and you could show an overview pyramid maybe? A one-liner with #linesOfCode would be magic :) Like others said, there could/should be other articles doing something similar (giving a couple of cool examples as an overview/introduction), focused on the areas/libraries/frameworks you mention. Please feel inspired. > About the article: When writing sample code with random, don't forget to add a paragraph explaining the random source. It is /dev/urandom? To randomize a String I write this: > > (UUID new asString reject: #isDigit) copyWithoutAll: '-'. Talking about the random source would lead a bit far, no ? I don't like your random string example, it is too contrived. The one I used is not perfect either, I would probably write it myself as String new: 256 streamContents: [ :string | 256 timesRepeat: [ string nextPut: 'abcdef' atRandom ] ]. But having to write 256 twice is not cool, hence the my other choice. > To count digits (doesn't work for 1 digit but I like it): > > 42 factorial log ceiling. That is cool indeed. What I wanted to show is that, not only are Pharo numbers real objects that can be mixed freely, without thinking about them, but that they are more than that: real normal objects that you can add lots of useful methods too. > I don't know how this could be useful besides doing many things: "Split a string on dashes, reverse the order of the elements and join them using slashes". If you could find a example with some real application would be nice too. Yes indeed, it does not make enough sense. Any ideas ? > For Collection messages people is often interested in speed comparisons. Because audience already knows how to do that in R, Python or other language. Speed is not the subject of the article. Sure, some operations can certainly be done in some other languages but certainly not in all of them, out of the box. I would really like to see the standard deviation one (17) done in other languages, for example. > Hope you could find them useful. Yes ;-) Sven > HernÃ¡n > > > > > 2014-07-07 19:21 GMT-03:00 Sven Van Caekenberghe <sven(a)stfx.eu>: > Hi, > > I have written a new article presenting Pharo using a list of 23 short examples. > > Elegant Pharo Code > > Beautiful & Powerful One-liners, Expressions and Snippets > > https://medium.com/@svenvc/elegant-pharo-code-bb590f0856d0 > > As mentioned at the end of the article, I welcome feedback, remarks, comments, alternative solutions and other examples. The idea is to create yet another way to lure people into exploring Pharo while explaining by example why we like Pharo. > > Enjoy! > > Sven > > -- > Sven Van Caekenberghe > Proudly supporting Pharo > http://pharo.org > http://association.pharo.org > http://consortium.pharo.org > > > > > >

July 9, 2014

Re: [Pharo-users] Close to 1000 followers on twitter... (>990 right now)

by Alexandre Bergel

This is truly fantastic. Thanks thanks thanks Marcus! Alexandre On Jul 9, 2014, at 3:33 PM, Marcus Denker <marcus.denker(a)inria.fr> wrote: > > On 08 Jul 2014, at 08:59, Marcus Denker <marcus.denker(a)inria.fr> wrote: > >> â¦ who will be the 1000th follower? >> >> > > Yes! 1002 now. Follower 1000 was @maxkreminski, congratulation ;-) > > Marcus -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

July 9, 2014

Re: [Pharo-users] Close to 1000 followers on twitter... (>990 right now)

by Marcus Denker

On 08 Jul 2014, at 08:59, Marcus Denker <marcus.denker(a)inria.fr> wrote: > â¦ who will be the 1000th follower? > > Yes! 1002 now. Follower 1000 was @maxkreminski, congratulation ;-) Marcus

July 9, 2014

Re: [Pharo-users] Dependencies in Monticello

by Esteban Lorenzano

Hi, wellâ¦ sources of VM we are using are currently here: https://github.com/pharo-project/pharo-vm there you can find instructions on how to make a VM, which also includes how to make a new âgenerator.imageâ which has everything you need to with all dependences loaded. The instructions to build such image are really simple: once you cloned the repository you just have to go to ./image and execute ./newImage.sh If you do not want to work like that, you can always use the ConfigurationOfCog metacello configuration to build the image or to check the dependences (thatâs what the script uses anyway). cheers, Esteban On 09 Jul 2014, at 15:04, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > Hi Annick, > > Not easy question. If there is a configuration, and if this configuration is well done, then you should load the software using the configuration. I have briefly checked Gstreamer, unfortunately there is no configuration. there is a configuration for VMMaker. > There are many different VMMaker on http://smalltalkhub.com > Try to load some by hand to see how it goes. > > Chees, > Alexandre > > > On Jul 9, 2014, at 3:00 PM, Annick Fron <info(a)afceurope.com> wrote: > >> Hi, >> >> I am trying to load Gstreamer from squeak source in Pharo 3.0, but it depends on VMMaker, and I donât know how to get the whole dependency tree. >> Has anybody tried it ? >> >> Annick Fron > > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > >

July 9, 2014

Re: [Pharo-users] Dependencies in Monticello

by Alexandre Bergel

Hi Annick, Not easy question. If there is a configuration, and if this configuration is well done, then you should load the software using the configuration. I have briefly checked Gstreamer, unfortunately there is no configuration. There are many different VMMaker on http://smalltalkhub.com Try to load some by hand to see how it goes. Chees, Alexandre On Jul 9, 2014, at 3:00 PM, Annick Fron <info(a)afceurope.com> wrote: > Hi, > > I am trying to load Gstreamer from squeak source in Pharo 3.0, but it depends on VMMaker, and I donât know how to get the whole dependency tree. > Has anybody tried it ? > > Annick Fron -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

July 9, 2014

Dependencies in Monticello

by Annick Fron

Hi, I am trying to load Gstreamer from squeak source in Pharo 3.0, but it depends on VMMaker, and I donât know how to get the whole dependency tree. Has anybody tried it ? Annick Fron

July 9, 2014