Here I'm back again with a (for me) really strange behaviour of my newest masterpiece...
This code should read a file, but it doesn't:
readCsvContents :: String -> IO ( String )
readCsvContents fileName = do
withFile fileName ReadMode (\handle -> do
contents <- hGetContents handle
return contents
)
main = do
contents <- readCsvContents "src\\EURUSD60.csv"
putStrLn ("Read " ++ show (length contents) ++ " Bytes input data.")
The result is
Read 0 Bytes input data.
Now I changed the first function and added a putStrLn:
readCsvContents :: String -> IO ( String )
readCsvContents fileName = do
withFile fileName ReadMode (\handle -> do
contents <- hGetContents handle
putStrLn ("hGetContents gave " ++ show (length contents) ++ " Bytes of input data.")
return contents
)
and the result is
hGetContents gave 3479360 Bytes of input data.
Read 3479360 Bytes input data.
WTF ??? Well, I know, Haskell is lazy. But I didn't know I had to kick it in the butt like this.
