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Re:
by Fergus Henderson 02 Dec '03

02 Dec '03

Manuel M T Chakravarty <chak(a)cse.unsw.edu.au> wrote: > I declare RC16 to be the final version of the H98 FFI > Addendum Version 1.0. Congratulations! I see that you posted the same message to the Haskell list, but I think it would be nice to also announce this on comp.lang.functional. Cheers, Fergus. -- Fergus Henderson <fjh(a)cs.mu.oz.au> | "I have always known that the pursuit The University of Melbourne | of excellence is a lethal habit" WWW: <http://www.cs.mu.oz.au/~fjh> | -- the last words of T. S. Garp.

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01 Dec '03

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Handle to haskell data
by David Waern 01 Dec '03

01 Dec '03

Hi. I want to know if it is possible via FFI and GHC to allocate haskell data structures and return some kind of handle to their internal representation in the haskell runtime to another language that calls haskell code (c/c++). Say, for example, that I want code a simple 3d-modelling program which uses haskell to create and modify objects and c to use this functionality and to present it to the user. When an object is to be created the c code would call some haskell function "Create" which returns the handle to the created object so that it can be passed along to other haskell functions that modifies the object. The c code would never have to know of the haskell datastructures representing the object (Of course, there would have to be a haskell function that returns a datastructure suited for drawing the object). I had a quick look at the FFI-spec and saw that it is possible to allocate and pass pointers to Storable types. I just don't want to reconstruct my datastructures back and forth to Storable types each time I need to do something on the haskell side. Does any of this make sense? I should probably look into the spec more before ranting so much :) I don't have much haskell experience so maybe this is just something that wouldn't come up if I would design my code properly. /David Waern

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by Rupert 01 Dec '03

01 Dec '03

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ANN: H98 FFI Addendum 1.0, Release Candidate 16
by Manuel M T Chakravarty 01 Dec '03

01 Dec '03

Dear Haskell Folks, Release Candidate 16 of the H98 FFI Addendum 1.0 is now available from http://www.cse.unsw.edu.au/~chak/haskell/ffi/ Since the last version of the Addendum announced on <haskell(a)haskell.org>, namely RC12, the FFI Task Force decided on a slight generalisation of the interface to finalizers as well as the addition of some support for string marshalling for characters sets beyond ASCII. A detailed change log is at the end of this message. I'd like to propose RC16 as the final form of Version 1.0 of the FFI Addendum. If you find any problems with this version, please raise them within the next two weeks. Cheers, Manuel -=- Changes since RC15: * 6.3: Footnote regarding __STDC_ISO_10646__ added to text introducing `CWString'. Changes since RC14: * 6.2: CWChar -> CWchar * 6.3: - CWChar -> CWchar - Stated explicitly that memory allocated by `newCString' and friends can be deallocated by `MarshalAlloc.free' - Improved documentation Changes since RC13: * 5.3: Fixed typo * 5.7: Fixed a mistake in the type of `peekByteOff' and `pokeByteOff' (the type variable constrained by `Storable' must be different from the parameter of the `Ptr') * 6.3: Improved documentation Changes since RC12: * Acks : Added John Meacham * 4.1.5: Bug fix courtesy of Wolfgang Thaller * 5.5 : Added `FinalizerEnvPtr', `newForeignPtrEnv', and `addForeignPtrFinalizerEnv' * 6.3 : Added John Meacham proposal for `wchar_t' support as well localised string marshalling; in particular, this adds `CWString' and `CWStringLen' as well as the `CWString' and the `CAString' family of marshalling routines. In addition, `charIsRepresentable' was added.

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