[Pharo-project] FFI number of arguments

Schwab,Wilhelm K bschwab at anest.ufl.edu
Tue Oct 5 22:58:47 EDT 2010


yes, that's what the link describes.  The open question is whether anyone has successfully done that with 15+ arguments?



________________________________________
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
>
>
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> Pharo-project mailing list
> Pharo-project at lists.gforge.inria.fr
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