On Mon, Jan 09, 2006 at 04:57:51PM +0100, Gracjan Polak wrote:
Hi all,
A bit strange behaviour with hPutStrLn. Consider following program:
main = do handle <- openFile "output.txt" WriteMode hPutStrLn handle (unlines contLines2) -- hFlush houtput where contLines2 = flip map [1..2000] $ \x -> show x ++ " been there done that"
Outputs file which ends with following lines:
1989 been there done that 1990 been there done that 1991 been there done that 1992 been there done that 199 (END)
So the output is truncated. When I uncomment hFlush, file is fully written. Is this expected/documented behaviour?
This is the usual behavior when file is not closed. And example from http://www.haskell.org/onlinereport/io.html suggests that using hClose is necessary.