On 1/9/06, Gracjan Polak
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?
Platform: WinXP, GHC version 6.4.1
Looks like the buffering is BlockBuffering for your output. Try changing that using hSetBuffering stdout LineBuffering (or NoBuffering). I believe it gets flushed if you close the file as well... /S -- Sebastian Sylvan +46(0)736-818655 UIN: 44640862