[Haskell-cafe] MutableByteArray as a Ptr

Joel Reymont joelr1 at gmail.com
Sat Oct 8 03:33:29 EDT 2005

This is no longer an issue as I found how to read and write Float and  
Double at the link below


Originally, I was looking to get a chunk of memory using getByteArray  
from NewBinary.Binary and read a Storable after converting the array  
to a pointer.

getByteArray :: BinHandle -> Int -> IO ByteArray
getByteArray bh (I# sz) = do
   (MBA arr) <- newByteArray sz
   let loop n
        | n ==# sz = return ()
        | otherwise = do
         w <- getByte bh
         writeByteArray arr n w
         loop (n +# 1#)
   loop 0#
   freezeByteArray arr

     Thanks, Joel

On Oct 8, 2005, at 4:49 AM, Donald Bruce Stewart wrote:

> Try it and see.. I think I have indeed done this in an old version of
> Yi. However, it sounds a bit iffy, and there's no reason not to use a
> ForeignPtr-ified malloc'd chunk of memory.


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