Re[2]: [Haskell-cafe] FFI basics
Hello Evan, Tuesday, February 27, 2007, 12:02:57 AM, you wrote: Unfortunately, ghc doesn't seem relink the target if cfile.o changed, so as a hack I put 'rm target' before the ghc line to make it link every time. it's a bug. i don't know whether it's already fixed, try it with the latest 6.6 snapshot #2 is structs. What's a good way to marshal structs? this depends on your actual task. in particular, you can write instances of Storable for your structures: instance (Storable a, Storable b) = Storable (a,b) where sizeOf (x,y) = sizeOf x + sizeOf y .. hsc2hs translator allows you to use offsets in C structures, see http://therning.org/magnus/archives/238 -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re[2]: [Haskell-cafe] FFI basics
Hello Magnus, Thursday, February 15, 2007, 3:08:41 PM, you wrote: I would like to use FFI for the first time. Can someone give me a Shameless self-promotion: http://therning.org/magnus/archives/238 great intro, better than my own! -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: Re[2]: [Haskell-cafe] FFI basics
Bulat Ziganshin wrote: examples of lifting C functions into Haskell world: mysin :: Double - Double mysin = realToFrac . c_mysin . realToFrac -- c_mysin :: CDouble - CDouble rnd :: Int - IO Int rnd x = do r - c_rnd (fromIntegral x) return (fromIntegral r) -- c_rnd :: CInt - IO CInt OK, got it. I'll put that in. Thanks, Yitz ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re[2]: [Haskell-cafe] FFI basics
Hello Yitzchak, Sunday, February 11, 2007, 4:14:39 AM, you wrote: when I have time. What Bulat wrote is in my opinion _exactly_ what is needed. i has a pedagogical talent :D searching for Haskell teacher position :))) -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re[2]: [Haskell-cafe] FFI basics
Hello Donald, Saturday, February 10, 2007, 11:21:58 AM, you wrote: foreign import ccall mysin.h mysin c_mysin :: Double - Double Shouldn't that be CDouble? At least for Int/CInt you can hit troubles on 64 bit machines... conceptually - yes. practically, it should be the same for all current platforms. of course, for maintained programs it's better to use safer approach -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
