Re: GHC version 5.00.2 is available
On Mon, 18 Jun 2001, Julian Seward (Intl Vendor) wrote: The (Interactive) Glasgow Haskell Compiler -- version 5.00.2 == [..] What's new in 5.00.2 == [..] How about Andrew Tolmach's -fext-core flag? Did it make it into 5.00.2 or do we have to wait for next official release? /Josef ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
passing Strings with FFI
Hello, I want to pass a String to a function which is imported from C code: foreign import pass prim_pass :: String - String The declaration above gives me an error from ghc like String type not supported for imported functions. I thought that String being [Char] should be supported (somehow like a definition with newtype keyword). Can you tell me how can I pass strings to and from C code, as simple as possible (I know about HDirect, but I couldn't make it work for me: red-hat 7.1, ghc 5.00)? Best regards, Corneliu ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
RE: passing Strings with FFI
| I want to pass a String to a function which is imported from C code:
| foreign import pass prim_pass :: String - String
| The declaration above gives me an error from ghc like String
| type not
| supported for imported functions.
| I thought that String being [Char] should be supported
| (somehow like a
| definition with newtype keyword).
| Can you tell me how can I pass strings to and from C code, as
| simple as
| possible (I know about HDirect, but I couldn't make it work
| for me: red-hat
| 7.1, ghc 5.00)?
First of all, upgrade to 5.00.2, since it is significantly less
buggy than 5.00.
int fooble ( char* str, int n )
{
fprintf(stderr, fooble called: %s %d\n, str, n );
return 42;
}
import PrelByteArr
import PrelPack (packString)
foreign import fooble fooble
fooble :: PackedString - Int - IO Int
type PackedString = ByteArray Int
main = do n - fooble (packString hello, C world) 99
putStrLn (Returned value is ++ show n)
For more examples read the compiler sources, at
fptools/ghc/compiler/ghci/Linker.lhs.
J
___
Glasgow-haskell-users mailing list
[EMAIL PROTECTED]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
