November 2017 - Pharo-users

Re: [Pharo-users] Binary (external) objects

by Todd Blanchard

UFFI (Universal Foreign Function Interface) is pretty good. It is how we access things like sqlite, cairo, and some other native frameworks. There is work going on to make it more automatic by leveraging libclang to parse headers and automate a lot of the grunt work. Search the list for FFI in the subject lines and you will find some things. -Todd Blanchard > On Nov 16, 2017, at 7:14 AM, Hans N Beck <hnbeck(a)educational-concepts.biz> wrote: > > Hi, > > is it possible - at least in theory - to build a VM such that Pharo could handle binary objects ? For example, there may be objects written in C, in Golang, Lisp... you could load the objects into to image, you would see their methods as all other Smalltalk Code, with the difference that you could not see the implementation or do Smalltalk level debugging. I have in mind the FMI of Modelica (http://fmi-standard.org <http://fmi-standard.org/>) > I donât now if the modern FFI already works like this. And now, I donât reestablidvh CORBA :) > > Cheers > > Hans

Nov. 16, 2017

Re: [Pharo-users] Pharo-Chrome (was: Soup bug(fix))

by Alistair Grant

Hi Sean & Mariano, On 16 November 2017 at 00:21, Sean P. DeNigris <sean(a)clipperadams.com> wrote: > Alistair Grant wrote >> I'm glad (and relieved :-)) to hear that it is working. >> >> Would you mind sending the modified command path that you're using so >> I can update the code? (I guess that it is just removing the >> backspaces, but just in case...). > > That is correctâ¦ > > OSSUnixSubprocess new > command: '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome'; > arguments: #('--user-data-dir=/tmp/pharo/GoogleChrome/debugSession' > '--remote-debugging-port=9222'); > run. Thanks for the confirmation. I'll update the package soon(ish). On 16 November 2017 at 12:16, Mariano Martinez Peck <marianopeck(a)gmail.com> wrote: > > Yeah, OSSubprocess wont interpret, not expand anything. If you want to use > shell, then you have to use #shellCommand: or #shell:command: (see its > senders for test examples) Sigh... The code originally just called system(). When I wanted to be able to terminate the chrome process I switched to OSSubprocess. The linux paths happen to not have spaces in them, and I didn't even think of this. Sorry about that. Cheers, Alistair

Nov. 16, 2017

Timespan translateToUTC problematic

by Trussardi Dario Romano

Ciao, i have a Pharo 4.0 image run on macbook with time zone is set to Rome +1 UTC . When i send the translateToUTC to Date instance it is ok: Date today > 2017-11-16T00:00:00+01:00 Date today translateToUTC > 2017-11-16T00:00:00+00:00 But for Month instance : Month month: 6 year: 2015 > 2015-06-01T00:00:00+01:00 ( Month month: 6 year: 2015 ) translateToUTC > 2015-06-01T00:00:00+01:00 The same problematic is for Year instance. Considerations ? Thanks, Dario

Nov. 16, 2017

Re: [Pharo-users] Anybody in this group in Bangalore or India

by Sanjay Minni

Thanks, I will reach out, Will request for a post in the blog when I have got something up Sanjay Stephane Ducasse-3 wrote > Thanks for the information. Let us know how to help you. > Do you want me to post this on the Pharo weekly blog? > > Stef > > > On Sun, Nov 12, 2017 at 1:14 PM, Sanjay Minni < > sm@ > > wrote: >> Hi Stef, >> >> This is a business application on Fixed Assets Management and I want to >> use >> Pharo+Seaside stack to make the current desktop application in the link >> below into an updated browser based application. >> http://www.minisoftindia.com/assetage/index.html >> >> This will be multi-tenanted hosted application in an internet server and >> there are features planned for users / tenants inter-connectivity so as >> to >> increase colloboration between users. >> >> Its planned as a subscription based model and if possible there will also >> be >> a desktop (local hosted) version as well. >> >> 2 Pharo group members took up the assignment / helped me and went along >> some >> way to design / build the partially done application but both are >> currently >> out of time hence I am looking at some associates. >> (they can pitch in here) >> >> Budget is a constraint as this is self funded hence I am looking at >> someone >> in India (preferably Bangalore) since hourly rates in the west works out >> to >> 5X rates in India. >> >> I though I will also get pharo skills and join hands but I guess learning >> is >> not that easy now >> >> The various applications at htto://www.minisoftindia.com/products were >> quite >> successful sometime back with a fair user base but since then were >> shelved. >> I plan to re-introduce them in a new Avatar >> >> i will be happy to answer any questions >> >> regards >> Sanjay >> >> >> Stephane Ducasse-3 wrote >>> Hi sanjay >>> >>> tell us more about this interesting project. >>> BTW I would love to have a success story from india and I know that >>> some people developed nice frameworks there but I forgot the contact. >>> >>> Stef >>> >>> On Sun, Nov 12, 2017 at 11:12 AM, Sanjay Minni < >> >>> sm@ >> >>> > wrote: >>>> Hi, >>>> >>>> Is there anybody in this group located in Bangalore, >>>> >>>> You could connect with me at sanjay.minni_at_gmail.com if you would >>>> like >>>> to >>>> join in an interesting project >>>> >>>> regards >>>> Sanjay >>>> >>>> >>>> >>>> ----- >>>> --- >>>> Regards, Sanjay >>>> -- >>>> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >>>> >> >> >> >> >> >> ----- >> --- >> Regards, Sanjay >> -- >> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >> ----- --- Regards, Sanjay -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Nov. 16, 2017

Re: [Pharo-users] Network data exchange - Basys and Seamless usage questioning

by Denis Kudriashov

2017-11-16 17:11 GMT+01:00 henry <henry(a)callistohouse.club>: > Have you seen ParrotTalk? > > http://www.squeaksource.com/Cryptography/ParrotTalk-HenryHouse.14.mcz > > <http://www.squeaksource.com/Cryptography/ParrotTalk-HenryHouse.14.mcz> > Requiring > > http://www.squeaksource.com/Cryptography/Cryptography-HenryHouse.113.mcz > > <http://www.squeaksource.com/Cryptography/Cryptography-HenryHouse.113.mcz>Where > could I find Seamless? I am doing similar with a project Raven: distributed > objects over encrypted ASN.1/STON encoded connections. > https://github.com/dionisiydk/Seamless > > Thank you. > > > Sent from ProtonMail Mobile > > > On Wed, Nov 15, 2017 at 18:09, CÃ©drick BÃ©ler <cdrick65(a)gmail.com> wrote: > > Hi, > > sorry for the late reply Denis, > > > Can you show example how you work with your objects using this network? > > > Itâs not fully decided yet. Iâm just trying to show that 2 peers A and B > can exchange and sync information without central server, but also > considering they have multiples devices (connected on demand P2P - offline > first is a major requirement). > > So for now, to test, I just connect A and B through basys by sending a > connection in both direction A->B B->A. I think ok keeping a "message hub Â» > specific to each interaction A can have with B(s), C(s)... A queue but that > kind of never deletes messages but changes its meta content - so as to sync > with other devices when they eventually connect). > > So for now, my need is quite simple regarding connections. > I used mostly for now #sendDataPacket: > > I could do it also with Zinc in HTTP. But, as always in Smalltalk, I > explore in plenty of directions and discover great stuffs like Seamless > perfectly usable and some less finished or older gems like BitTalk or > UbiquiTalkâ¦ Very interesting as I will need more functionalities to deal > with decentralized networks. > > > BasisNetworkStub is only created for tests. And I think it misses one > important function: how identify peers. When your image get new connection > it should identify what remote peer is connected by it. So two connections > from same remote image should be identified as single peer instance on your > local image. > > > Yes, sure Iâve spotted that and I definitely need a way to identify > peer-devices (belonging to a peer realm/swarm). Iâll do later. > > > I would of course use Seamless for distributed applications because it > allows to implement solution with objects locally and then transparently > split them over network. > But Seamless not implements any kind of message queue. So I would use some > proven solution for it instead of custom implementation. But it can depends > on the task. > > > Do you think of something in particular ? :) > For now my queue will only be ordered collections or whatever simple > collection. It should be enough to start with. > > > >> 2) or may I use Seamless straight with restrictions (I wonder if limiting >> the classes that can be executed would suffice - proxies should only be on >> the peer inbox and outbox I think) ? > > 3) or maybe I should do a lighter version of seamless ? If so where should >> I look at/change ? >> > > You can try subclass SeamlessNetwork and override request processing > method with special restrictions on what requests are permitted. Maybe you > can propose such kind of policy to the Seamless itself. > > > > Subclassing Seamless seems to be a very good simple and powerful > possibility (to get inspiration too) and I may do that. > > Anyway most of what I have to do is build a system that seamlessly present > to the user information extracted from messages (stored locally- versioned) > => its actually just transposing what you all are used too with tools like > git but applied to Â« general information exchange and processing Â». > Enterprise information systems are so boringâ¦ they should be far more a la > smalltalk ^^ > > Cheers, > > CÃ©drick > > >

Nov. 16, 2017

Re: [Pharo-users] Network data exchange - Basys and Seamless usage questioning

by henry

Have you seen ParrotTalk? http://www.squeaksource.com/Cryptography/ParrotTalk-HenryHouse.14.mcz http://www.squeaksource.com/Cryptography/ParrotTalk-HenryHouse.14.mczRequir… http://www.squeaksource.com/Cryptography/Cryptography-HenryHouse.113.mcz http://www.squeaksource.com/Cryptography/Cryptography-HenryHouse.113.mczWhe… could I find Seamless? I am doing similar with a project Raven: distributed objects over encrypted ASN.1/STON encoded connections. Thank you. Sent from ProtonMail Mobile On Wed, Nov 15, 2017 at 18:09, CÃ©drick BÃ©ler <cdrick65(a)gmail.com> wrote: > Hi, > > sorry for the late reply Denis, > >> Can you show example how you work with your objects using this network? > > Itâs not fully decided yet. Iâm just trying to show that 2 peers A and B can exchange and sync information without central server, but also considering they have multiples devices (connected on demand P2P - offline first is a major requirement). > > So for now, to test, I just connect A and B through basys by sending a connection in both direction A->B B->A. I think ok keeping a "message hub Â» specific to each interaction A can have with B(s), C(s)... A queue but that kind of never deletes messages but changes its meta content - so as to sync with other devices when they eventually connect). > > So for now, my need is quite simple regarding connections. > I used mostly for now #sendDataPacket: > > I could do it also with Zinc in HTTP. But, as always in Smalltalk, I explore in plenty of directions and discover great stuffs like Seamless perfectly usable and some less finished or older gems like BitTalk or UbiquiTalkâ¦ Very interesting as I will need more functionalities to deal with decentralized networks. > >> BasisNetworkStub is only created for tests. And I think it misses one important function: how identify peers. When your image get new connection it should identify what remote peer is connected by it. So two connections from same remote image should be identified as single peer instance on your local image. > > Yes, sure Iâve spotted that and I definitely need a way to identify peer-devices (belonging to a peer realm/swarm). Iâll do later. > >> I would of course use Seamless for distributed applications because it allows to implement solution with objects locally and then transparently split them over network. >> But Seamless not implements any kind of message queue. So I would use some proven solution for it instead of custom implementation. But it can depends on the task. > > Do you think of something in particular ? :) > For now my queue will only be ordered collections or whatever simple collection. It should be enough to start with. > >> >> >>> 2) or may I use Seamless straight with restrictions (I wonder if limiting the classes that can be executed would suffice - proxies should only be on the peer inbox and outbox I think) ? >> >>> 3) or maybe I should do a lighter version of seamless ? If so where should I look at/change ? >> >> You can try subclass SeamlessNetwork and override request processing method with special restrictions on what requests are permitted. Maybe you can propose such kind of policy to the Seamless itself. > > Subclassing Seamless seems to be a very good simple and powerful possibility (to get inspiration too) and I may do that. > > Anyway most of what I have to do is build a system that seamlessly present to the user information extracted from messages (stored locally- versioned) => its actually just transposing what you all are used too with tools like git but applied to Â« general information exchange and processing Â». > Enterprise information systems are so boringâ¦ they should be far more a la smalltalk ^^ > > Cheers, > > CÃ©drick

Nov. 16, 2017

Binary (external) objects

by Hans N Beck

Hi, is it possible - at least in theory - to build a VM such that Pharo could handle binary objects ? For example, there may be objects written in C, in Golang, Lisp... you could load the objects into to image, you would see their methods as all other Smalltalk Code, with the difference that you could not see the implementation or do Smalltalk level debugging. I have in mind the FMI of Modelica (http://fmi-standard.org) I donât now if the modern FFI already works like this. And now, I donât reestablidvh CORBA :) Cheers Hans

Nov. 16, 2017

[ANN] Willow 4.0.0 released!

by Gabriel Cotelli

Hi, We're happy to announce the general availability of Willow and it's related projects in the Web Stack ecosystem hosted at https://github.com/ba-st/. Willow is a Web Interaction Library that eases the burden of creating AJAX-based web applications. The project goals are: - Provide a Smalltalk protocol for the interactive behavior of web components - Reify the pieces of a web application to improve reuse - Offer a simple and polymorphic protocol for different front-end frameworks. It's MIT licensed and built on top of the Seaside <https://github.com/SeasideSt/Seaside> Web Framework providing a set of composable components and easier AJAX interaction. It's intented to work alongside the RenoirSt <https://github.com/ba-st/RenoirSt> DSL to define the CSS of your application. This is a multi-release announcement of the following related projects: - Willow <https://github.com/ba-st/Willow> v4.0.0 : Core features, components and commands - Willow-Bootstrap <https://github.com/ba-st/Willow-Bootstrap> v4.0.0 : Bootstrap 3 integration, components and plugins - Willow-JQueryUI <https://github.com/ba-st/Willow-JQueryUI> v4.0.0 : JQuery UI integration and components. - Willow-SpinKit <https://github.com/ba-st/Willow-SpinKit> v1.0.2 : Spinner components - Willow-Playground <https://github.com/ba-st/Willow-Playground/> v1.0.0 : An interactive presentation introducing the project and two example applications: Web Based Test Runner and Live Docs. - RenoirSt <https://github.com/ba-st/RenoirSt> v3.3.0 : CSS DSL. [ Latest Changes: Updated Seaside dependencies (for the Seaside extensions groups) and added Pharo 7 to the build matrix. ] SemanticUI <https://github.com/ba-st/Willow-SemanticUI> integration is still a work in progress. We've started working on a more complete tutorial and a Pharo booklet. Anyone interested in joining our ba-st projects <https://github.com/ba-st/> is welcome Regards, Gabriel Cotelli, Maxi Tabacman and all the contributors.

Nov. 16, 2017

Re: [Pharo-users] UFFI C basic types passed-by-reference for output

by Ben Coman

On 15 November 2017 at 20:47, Esteban Lorenzano <estebanlm(a)gmail.com> wrote: > > > On 15 Nov 2017, at 09:36, Ben Coman <btc(a)openInWorld.com> wrote: > > > > > On 15 November 2017 at 17:27, Esteban Lorenzano <estebanlm(a)gmail.com> > wrote: > >> >> >> > On 15 Nov 2017, at 02:05, Ben Coman <btc(a)openInWorld.com> wrote: >> > >> > What is the recommended way for a C basic type to be >> passed-by-reference to function wanting to use it for output. >> > For example 'width' & 'height' here in this library unction... >> > >> > int FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document, >> > int page_index, >> > double* width, >> > double* height); >> > >> > void mytestGetPageSizeByIndex(doc) { >> > double width, height; >> > FPDF_GetPageSizeByIndex(doc, 0, &width, &height); >> > printf("width=%f, height=%f\n", width, height); >> > } >> > >> > gives... >> > width=200.000000, height=200.000000 >> > >> > >> > >> > In Pharo I'm trying... >> > >> > FFIOpaqueObject subclass: #FPDF_DOCUMENT >> > >> > FPDF_GetPageSizeByIndex__document: document >> > page_index: page_index >> > width: width >> > height: height >> > ^self ffiCall: #(int FPDF_GetPageSizeByIndex( >> > FPDF_DOCUMENT *document, >> > int page_index, >> > FFIFloat64 * width, >> > FFIFloat64 * height)) >> > >> > >> > testGetPageSizeByIndex >> > | document page_index width height result| >> > PDFium FPDF_InitLibrary. >> > document := PDFium FPDF_LoadDocument__file_path: helloPdf >> password: ''. >> > width := 0.0. >> > height := 0.0. >> > page_index := 0. "Its zero based" >> > result := PDFium FPDF_GetPageSizeByIndex__document: document >> > page_index: 0 >> > width: width >> > height: height. >> > PDFium FPDF_CloseDocument__document: document. >> > PDFium FPDF_DestroyLibrary. >> > self assert: document isNull not. "Document opened okay, and btw >> this works for a different pageCount test" >> > self assert: result > 0. "Non-zero for success. 0 for error >> (document or page not found)" >> > self halt. >> > >> > >> > and at the halt the Inspector shows... >> > result = 1 >> > width = 0.0 >> > height = 0.0 >> >> no, that will not work :) >> what you need to do here is to pass a âbufferâ to contain the width and >> height: >> >> testGetPageSizeByIndex >> | document page_index widthBuffer heightBuffer width height >> result| >> PDFium FPDF_InitLibrary. >> document := PDFium FPDF_LoadDocument__file_path: helloPdf >> password: ''. >> widthBuffer := ByteArray new: (FFIFloat64 typeSize). >> heightBuffer := ByteArray new: (FFIFloat64 typeSize). >> > > Thanks Esteban. That worked. However I needed a minor tweak... > widthBuffer := ByteArray new: (FFIFloat64 new typeSize). > or... > widthBuffer := ByteArray new: (FFIFloat64 externalTypeSize). > > > Now it would be nice to do... > widthBuffer := FFIFloat64 newBuffer. > > > you know, I thought the same :) > but since Iâm officially on holiday I didnât do it (yet). > > If you want to add an issue and send a PR, it would be perfect :) > > > which could be implemented... > FFIExternalType class >> newBuffer. > ^ByteArray new: (self externalTypeSize) > > testGetPageSizeByIndex > | document page_index widthBuffer heightBuffer width height result| > PDFium FPDF_InitLibrary. > document := PDFium FPDF_LoadDocument__file_path: helloPdf > password: ''. > widthBuffer := FFIFloat64 buffer. > heightBuffer := FFIFloat64 buffer. > page_index := 0. "Its zero based" > result := PDFium FPDF_GetPageSizeByIndex__document: document > page_index: 0 > width: widthBuffer > height: heightBuffer. > width := widthBuffer doubleAt: 1. > height := heightBuffer doubleAt: 1. > > > > btw, a broader curiousity even though this is likely set in stone and not > even your personal choice - why "FFIFloat64" and not "FFIDouble" ? > widthBuffer := FFIDouble newBuffer. > would be a nice match to the callout declaration. > > > because the ABI defines float64 as the right name, heh. > and yes, it was not my personal choice ;) > > > Would it be overkill to have in Pharo an empty FFIDouble subclassed from > FFIFloat64 ? > the superclass being explicit about the format, while the subclass > provides a nice identifier for users? > > > maybe it is overkilling. Because alsoâ¦ where do you put the limit? > (doubles, floats, longs, etcâ¦ ?) > > Well, there are not so many... ?? cheers -ben

Nov. 16, 2017

Re: [Pharo-users] UFFI C basic types passed-by-reference for output

by Ben Coman

On 15 November 2017 at 20:47, Esteban Lorenzano <estebanlm(a)gmail.com> wrote: > On 15 Nov 2017, at 09:36, Ben Coman <btc(a)openInWorld.com> wrote: > > On 15 November 2017 at 17:27, Esteban Lorenzano <estebanlm(a)gmail.com> > wrote: > >> >> >> > On 15 Nov 2017, at 02:05, Ben Coman <btc(a)openInWorld.com> wrote: >> > >> > What is the recommended way for a C basic type to be >> passed-by-reference to function wanting to use it for output. >> > For example 'width' & 'height' here in this library unction... >> > >> > In Pharo... >> > >> > FFIOpaqueObject subclass: #FPDF_DOCUMENT >> > >> > FPDF_GetPageSizeByIndex__document: document >> > page_index: page_index >> > width: width >> > height: height >> > ^self ffiCall: #(int FPDF_GetPageSizeByIndex( >> > FPDF_DOCUMENT *document, >> > int page_index, >> > FFIFloat64 * width, >> > FFIFloat64 * height)) >> >> what you need to do here is to pass a âbufferâ to contain the width and >> height: >> >> testGetPageSizeByIndex >> | document page_index widthBuffer heightBuffer width height >> result| >> PDFium FPDF_InitLibrary. >> document := PDFium FPDF_LoadDocument__file_path: helloPdf >> password: ''. >> widthBuffer := ByteArray new: (FFIFloat64 typeSize). >> heightBuffer := ByteArray new: (FFIFloat64 typeSize). >> > > Thanks Esteban. That worked. However I needed a minor tweak... > widthBuffer := ByteArray new: (FFIFloat64 new typeSize). > or... > widthBuffer := ByteArray new: (FFIFloat64 externalTypeSize). > > > Now it would be nice to do... > widthBuffer := FFIFloat64 newBuffer. > > > you know, I thought the same :) > but since Iâm officially on holiday I didnât do it (yet). > > If you want to add an issue and send a PR, it would be perfect :) > https://pharo.fogbugz.com/f/cases/20699/ btw, how do we write tests for FFI? Do we (or can we) deliver as part of standard opensmalltalk-vm a small shared library "libFFITestFrame.so" to write ffi tests against? With functions like... void passByRefOutputs(int *p_int, double *p_double) { *p_int = 42; *p_double = 4.2; } cheers -ben

Nov. 16, 2017