Ashley Yakeley <[EMAIL PROTECTED]> wrote, > At 2001-09-20 06:55, Manuel M. T. Chakravarty wrote: > > >The FFI does not ensure any type consistency between the > >arguments to `Ptr'/`ForeignPtr' and the corresponding C > >types. > > I've been using 'Ptr Word8' with newArray to pass lists of bytes to C > functions. They appear as unsigned char arrays in the C function. Is this > wrong, or not guaranteed? It is guaranteed that when you marshal a `[Word8]' into a `Ptr Word8' with newArray that you get a contiguous memory area filled with the bytes from the list. So, what you are doing is perfectly fine. What I meant with the remark that you quote is that if you would use foreign import foo :: Ptr Int -> IO Float with float foo (float *x) { return *x; } the system will not complain, but your program may dump core. Manuel _______________________________________________ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
- Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Manuel M. T. Chakravarty
- RE: Ptr and ForeignPtr Questions Simon Marlow
- Re: Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Manuel M. T. Chakravarty
- RE: Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Ashley Yakeley
- RE: Ptr and ForeignPtr Questions Simon Marlow
- RE: Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Manuel M. T. Chakravarty
- Re: Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Manuel M. T. Chakravarty
- Re: Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Manuel M. T. Chakravarty
- Re: Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Manuel M. T. Chakravarty
- Re: Ptr and ForeignPtr Questions Ashley Yakeley
- Re: Ptr and ForeignPtr Questions Manuel M. T. Chakravarty
- Re: Ptr and ForeignPtr Questions Marcin 'Qrczak' Kowalczyk
- Re: Ptr and ForeignPtr Questions Ashley Yakeley