Re: [Haskell-cafe] FFI woes!

On Wed, Dec 15, 2004 at 04:09:04AM +0100, Sebastian Sylvan wrote:

FMUSIC_MODULE * F_API FMUSIC_LoadSong( const char *name );

By doing this in Haskell:

data MusicModule = MusicModule

foreign import ccall "fmod.h FMUSIC_LoadSong" fmusic_LoadSong :: CString -> IO ForeignPtr MusicModule)

I assume that this is how the ForeignPtr is meant to be used (with a dummy data type).

No, a ForeignPtr is a purely haskell object. The C function returns a Ptr. You could create a ForeignPtr from the Ptr if you want it to be automatically freed (calling somesort of FreeSong, presumably) when it gets garbage collected. -- David Roundy http://www.darcs.net