[Pharo-project] FFI number of arguments

Eliot Miranda eliot.miranda at gmail.com
Wed Oct 6 14:38:03 EDT 2010


Bill,

On Wed, Oct 6, 2010 at 10:24 AM, Schwab,Wilhelm K <bschwab at anest.ufl.edu>wrote:

> Miguel,
>
> I do not "need" to make the call.  I am wondering whether I can do so in a
> way that will benefit others, or I should just say the hell with it and
> either provide similar functionality a different way or provide the same
> functionality via a .so of my own creation.  The latter is fine for me but
> does not do much for anyone else.
>
> And let's say I make it and the thing seg faults.  How can I tell the
> difference between a limitation of the plugin or a mistake on my part
> calling a fairly cumbersome function?  The answer: I can't, not without work
> that I cannot justify doing when a ready solution exists.
>

You can.  You're just too lazy to try.  You need to read (at least)
http://en.wikipedia.org/wiki/Reciprocal_altruism.  I share Miguel's and
Nicolas' impressions of you.  I see you taking much more than you give and
it's straining my patience.

Eliot


> Bill
>
>
>
> ________________________________________
> From: pharo-project-bounces at lists.gforge.inria.fr [
> pharo-project-bounces at lists.gforge.inria.fr] On Behalf Of Miguel Cobá [
> miguel.coba at gmail.com]
> Sent: Wednesday, October 06, 2010 12:52 PM
> To: Pharo-project at lists.gforge.inria.fr
> Subject: Re: [Pharo-project] FFI number of arguments
>
> El mié, 06-10-2010 a las 12:33 -0400, Schwab,Wilhelm K escribió:
> > Miguel,
> >
> > I see it very differently: I do extensive searches and summarize the
> results, dropping keywords along the way that I wish had been present in
> what I finally uncovered somewhere else.  The Pharo archives are then a more
> rich resource they than had been.  I happen to know it works, because many
> of the helpful messages I find are in fact mine.
> >
> > As for whether I could "easily" make the call in question: give me a
> break.  It has roughly 20 arguments, and would be a fair amount of work to
> set up.  If someone else knows one way or the other, it might trigger either
> a reply along the lines of  "yeah, I did ti with 30 arguments" or "I fell
> for that, the plugin choked on...."  Restating what I linked from another
> group is not helpful, nor is telling me how easy it would be to do something
> that you have never seen.  Did it occur to you that there might be pointer
> arguments that would be a potential sources of complexity?  You might read
> what I asked: "have you tried this?"  Not "please do this for me."  It would
> be wasteful to attempt the call without asking for scouting reports.
> >
>
> But in the end if you really need to use that call, either it works or
> don't, you'll need to write it, even if someone says that it doesn't
> work. Why, because you need it, and if you don't need it then your
> question is rhetoric, because you don't even mind the answer.
> You can't ask for advise for every and each step you take, most times
> you should walk away, _fix_ what you find wrong and then report back the
> fix. That would really make the archives more rich because you are
> contributing back real knowledge and maybe code and not just polluting
> the archives with threads that ask things but solve nothing for anyone
> but you.
>
> Cheers
>
>
> > Bill
> >
> >
> >
> > ________________________________________
> > From: pharo-project-bounces at lists.gforge.inria.fr [
> pharo-project-bounces at lists.gforge.inria.fr] On Behalf Of Miguel Cobá [
> miguel.coba at gmail.com]
> > Sent: Wednesday, October 06, 2010 12:13 PM
> > To: Pharo-project at lists.gforge.inria.fr
> > Subject: Re: [Pharo-project] FFI number of arguments
> >
> > El mié, 06-10-2010 a las 11:50 -0400, Schwab,Wilhelm K escribió:
> > > Levente,
> > >
> > > What problem do you have with asking whether someone else has already
> tried it?  Really, have you not seen examples of working hard on advice from
> one source only to discover yet another limit that was not in fine print?
> > >
> >
> > But Bill, almost all your questions are long and without apparent focus
> > on the real point. Some other times are like this, things that you could
> > easily test by yourself maybe in less time that takes you to write so
> > many words, send the email and wait for a response from someone willing
> > to decipher what the real problem is. Other times you point at problems
> > that you find in your environment without giving better hints than "in a
> > hopefully updated image", "in a, I think, not modified image", "in my
> > machine", that doesn't help in helping you.
> > Then you point some problems that it appears that are very evident to
> > you and whose solution is also very obvious to you but you don't provide
> > a fix for them neither, like the always topic of yours about sockets.
> >
> > Then when someone points and the  obvious things you should do (your
> > homework, in verifying yourself what you are asking to the list) or to
> > precise the information needed to better answer you, you respond upset
> > as if anyone should be obliged to answer you or even read your mails.
> >
> > So, please, read
> >
> > http://www.catb.org/esr/faqs/smart-questions.html
> >
> > do your homework and then ask the list.
> >
> >
> >
> >
> > >
> > >
> > >
> > > ________________________________________
> > > From: pharo-project-bounces at lists.gforge.inria.fr [
> pharo-project-bounces at lists.gforge.inria.fr] On Behalf Of Levente Uzonyi [
> leves at elte.hu]
> > > Sent: Tuesday, October 05, 2010 11:09 PM
> > > To: Pharo-project at lists.gforge.inria.fr
> > > Subject: Re: [Pharo-project] FFI number of arguments
> > >
> > > On Tue, 5 Oct 2010, Schwab,Wilhelm K wrote:
> > >
> > > > yes, that's what the link describes.  The open question is whether
> anyone has successfully done that with 15+ arguments?
> > >
> > > It works up to 128 arguments. But why don't you try it yourself?
> > >
> > >
> > > Levente
> > >
> > > >
> > > >
> > > >
> > > > ________________________________________
> > > > From: pharo-project-bounces at lists.gforge.inria.fr [
> pharo-project-bounces at lists.gforge.inria.fr] On Behalf Of Levente Uzonyi [
> leves at elte.hu]
> > > > Sent: Tuesday, October 05, 2010 10:26 PM
> > > > To: Pharo-project at lists.gforge.inria.fr
> > > > Subject: Re: [Pharo-project] FFI number of arguments
> > > >
> > > > On Tue, 5 Oct 2010, Schwab,Wilhelm K wrote:
> > > >
> > > >> Hello all,
> > > >>
> > > >> I have been bumping into some functions with large numbers of
> arguments.  One in particular would be best handled in the image if at all
> possible.  The following might be the answer:
> > > >>
> > > >>
> http://thread.gmane.org/gmane.comp.lang.smalltalk.squeak.general/98538/focus=98543
> > > >>
> > > >> Have any of you done this with >15 (or whatever the cutoff is)
> arguments?
> > > >
> > > > You can create your own function object and invoke it with an array.
> > > > Here's an fprintf example on windows:
> > > >
> > > > fprintf := ExternalLibraryFunction
> > > >        name: 'fprintf'
> > > >        module: 'msvcrt.dll'
> > > >        callType: ExternalFunction callTypeCDecl
> > > >        returnType: ExternalType signedLong
> > > >        argumentTypes: {
> > > >                (ExternalType structTypeNamed: #FILE) asPointerType.
> > > >                ExternalType string.
> > > >                ExternalType signedLong }.
> > > > file := Stdio default fopenWith: 'test.txt' with: 'w'.
> > > > fprintf invokeWithArguments: { file. 'Your number is %d.'. 42 }.
> > > > Stdio default fcloseWith: file.
> > > >
> > > >
> > > > Levente
> > > >
> > > > P.S.: Note that you need the FILE and Stdio classes to run this
> example.
> > > >
> > > >>
> > > >> Bill
> > > >>
> > > >>
> > > >> _______________________________________________
> > > >> Pharo-project mailing list
> > > >> Pharo-project at lists.gforge.inria.fr
> > > >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
> > > >>
> > > >
> > > > _______________________________________________
> > > > Pharo-project mailing list
> > > > Pharo-project at lists.gforge.inria.fr
> > > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
> > > >
> > > > _______________________________________________
> > > > Pharo-project mailing list
> > > > Pharo-project at lists.gforge.inria.fr
> > > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
> > > >
> > >
> > > _______________________________________________
> > > Pharo-project mailing list
> > > Pharo-project at lists.gforge.inria.fr
> > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
> > >
> > > _______________________________________________
> > > Pharo-project mailing list
> > > Pharo-project at lists.gforge.inria.fr
> > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
> >
> > --
> > Miguel Cobá
> > http://miguel.leugim.com.mx
> >
> >
> > _______________________________________________
> > Pharo-project mailing list
> > Pharo-project at lists.gforge.inria.fr
> > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
> >
> > _______________________________________________
> > Pharo-project mailing list
> > Pharo-project at lists.gforge.inria.fr
> > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
>
> --
> Miguel Cobá
> http://miguel.leugim.com.mx
>
>
> _______________________________________________
> Pharo-project mailing list
> Pharo-project at lists.gforge.inria.fr
> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
>
> _______________________________________________
> Pharo-project mailing list
> Pharo-project at lists.gforge.inria.fr
> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
>
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