Re: [Haskell-cafe] Writing binary files?

12 Sep 2004


      Abraham Egnor wrote:
...
Passing a Ptr isn't that onerous; it's easy enough to make functions
that have the signature you'd like:
import System.IO
import Data.Word (Word8)
import Foreign.Marshal.Array
hPutBytes :: Handle -> [Word8] -> IO ()
hPutBytes h ws = withArray ws $ \p -> hPutBuf h p $ length ws
hGetBytes :: Handle -> Int -> IO [Word8]
hGetBytes h c = allocaArray c $ \p ->
    do c' <- hGetBuf h p c
       peekArray c' p
The problem with this approach is that the entire array has to be held
in memory, which could be an issue if the amount of data involved is
large.

-- 
Glynn Clements