L.S.,
I hope someone can help me with the following:
I am trying to check the SHA1 hash of a file, using the package cryptohash
[0]; the following error message is displayed when I try to compile my
program:
SHA1check.lhs:35:32:
Couldn't match expected type `B.ByteString'
against inferred type `Data.ByteString.Internal.ByteString'
In the second argument of `(.)', namely `hashlazy'
In the second argument of `(.)', namely `B.unpack . hashlazy'
In the first argument of `(<$>)', namely
`show . B.unpack . hashlazy'
The relevant lines of code are:
import qualified Data.ByteString.Lazy as B
import Data.CryptoHash.SHA1 ( hashlazy )
hash <- show . B.unpack . hashlazy <$> B.hGetContents h
There is only one version of the bytestring package installed.
Details:
- Windows XP
- bytestring-0.9.1.7
- cryptohash-0.5.1
- Haskell Platform 2010.2.0.0
Regards,
Henk-Jan van Tuyl
P.S. A patch is needed if you want to install cryptohash with MinGW
[0] http://hackage.haskell.org/package/cryptohash
--
http://Van.Tuyl.eu/
http://members.chello.nl/hjgtuyl/tourdemonad.html
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