[squeak-dev] Re: FFI/Alien: Structures with arrrayed fields

Schwab,Wilhelm K bschwab at anest.ufl.edu
Mon Mar 15 15:33:07 UTC 2010


Re your suggestion about making an external structure for "complex," please consider that done.  The question is how to then handle the array (of pointers), and even the array of longs.


-----Original Message-----
From: pharo-project-bounces at lists.gforge.inria.fr [mailto:pharo-project-bounces at lists.gforge.inria.fr] On Behalf Of Schwab,Wilhelm K
Sent: Monday, March 15, 2010 8:29 AM
To: Pharo-project at lists.gforge.inria.fr; squeak-dev at lists.squeakfoundation.org
Subject: [Pharo-project] FFI/Alien: Structures with arrrayed fields

Hello all,

I am faced with something like the following:

struct complex { double real; imaginary; }; struct ugly {
	int gratuitousSize;
	long importantStuff[64];
	complex * moreImportantStuff[64];

The question is how to explain this to FFI?  The closest things I have found always seem to be byte arrays, so the "third element" in the arrays of #fields is not well-revealed.  Does anyone know whether it is additive or multiplicative, and/or how to use it to make sense of the above struct?


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