beginner question

14 Oct 2009

      Just a Haskell beginner question. 

If I load in GHCi the code below all works fine, I load a file and its content is shown on screen. But if I use the second version of my "load_by_key" (the commented one) no error is reported loading and executing this code, but nothing is shown on screen. Where is my mistake?

I'm using GHC 6.10.4 on MacOS X 10.5.8

Thanks in advance.

Luca.

module BackEnd
    where

import IO

load_by_key :: String -> String -> IO ()

load_by_key table key = do
                          inh <- openFile table ReadMode
                          contents <- hGetContents inh
                          get_record (get_string contents) key
                          hClose inh

{-
load_by_key table key = do
                          contents <- getTableContent table
                          get_record (get_string contents) key
-}  

get_string :: String -> String
get_string = (\x -> x)

get_record :: String -> String -> IO ()
get_record contents key = putStr( contents ) 

getTableContent :: String -> IO String
getTableContent table = bracket (openFile table ReadMode)
                                hClose
                                (\h -> (hGetContents h))

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beginner question

Luca Ciciriello