Thank you Krzystof! This did the trick. Now I also have a better understanding what is going on. Great.
Kees Van: Krzysztof Skrzętnicki [mailto:gte...@gmail.com] Verzonden: woensdag 29 mei 2013 11:58 Aan: Kees Bleijenberg Onderwerp: Re: [Haskell-cafe] using a win32 dll Oh, I didn't mean kernel32. And -L provides search path not the actual library. The idea was to use -l<yourLibrary.dll> , so it would be -lpngDLL.dll, provided it is in library search path. If not use -Ldirectory-with-dll -lpngDLL.dll On Wed, May 29, 2013 at 11:49 AM, Kees Bleijenberg <k.bleijenb...@lijbrandt.nl> wrote: I’ve tried to compile it with –l kernel32, but nothing changed. I’ve also tried -LpngDll.dll but that didn’t work either. Kees My first guess would be missing -l parameter. The examples you have linked read: ghc --make compname.hs -lkernel32 Best regards, Krzysztof Skrzętnicki On Wed, May 29, 2013 at 9:13 AM, Kees Bleijenberg <k.bleijenb...@lijbrandt.nl> wrote: I made a Delphi dll (32 bits windows). This dll exports a function named getPngVersion. This is a function with no arguments that returns a pointer to a array of chars. If I examine the dll with a tools like tdump, I can see the function getPngVersion on index 1. Now I want to use this dll in Haskell: {-# LANGUAGE ForeignFunctionInterface #-} module Main( main ) where import Control.Monad import Foreign.C import Foreign.Marshal.Alloc import Foreign.Marshal.Array import System.Win32.Types foreign import stdcall "glasPng getPngVersion" getPngDllVersion :: IO CString main :: IO () main = do s <- getPngDllVersion putStrLn (show s) Compiling this with ghc --make glasPng.hs gives: GlasPng.o: fake: (.text +0x82): undefined reference to ‘getPngVersion@0’ collect2 : Id returned 1 exit status I wonder what went wrong. In the foreign import line I use “glasPng…. “ to tell ghc, it has to searh in glasPng.dll (changing glasPng to glasPng.dll doesn’t help). I’ve changed the name of the function in the dll to getPngVersion@0 but no luck. I’ve read and tested the last example at http://stackoverflow.com/questions/1027246/haskell-foreign-import-stdcall-on-dll-function (win32_getComputername, this works!). I wonder how haskell knows which dll to use in this example?) Probably I’am doing something wrong with the way I tell ghc which dll to link or…. Any ideas? Kees _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
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