-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Your problems might be due to buffering. Try setting the stdin and stdout to 'NoBuffering'.
BTW, how are your exceptions getting thrown? Tom On Tue, 12 Aug 2003 05:20 pm, Alexandre Weffort Thenorio wrote: > I have a program which creates textfiles out of other files. Since the > program is runned from windows I output some text strings (Like "File > created succefully") and I need to stop the program before it quits so that > the user can read the line outputted to know what went on and then he can > press ENTER to quit the program. > > I managed to do this fine if no error occurs but when a error occurs I am > having problems. > > The code goes like that > > main :: IO() > main =catch (do > Do all the needed stuff here > putStr "File created Successfully. Press RETURN to > quit" > dummy <- getLine --Halts the program so the user can > read the above line) > putStr "Exiting now..." --needed since I can't finish > a do function with the "dummy<- getLine" line) (\_ -> do putStr "\nFile not > found. Press RETURN (ENTER) to quit." > dumb <- getLine > putStr "\nExiting...") > > So when the program runs, if the input file is found the program writes > successfull creation of file but if the file doesn't exist, after the user > gives the input filename and press enter, the program creates a new line > and Halts (Probably because of the getLine function) without writing out > anything, then when the user press ENTER again it writes the line at the > first putStr (File not...), then writes the next putStr line under it > (Exiting...) and exits. I don't know why it doesn't wirte the first line, > halts and then when user press enter it writes the second and quits. > > Can anybody help me as I am not very familiar with exception and catches. > > > Another question I have is: Is there any other function rather than getLine > that halts a program and continues when a user press any key (Instead of > ENTER) and besides this is an ugly code since getLine wasn't made for that > but I couldn't find anything else myself. > > Thank you in advance. > > Best Regards > > Alex > > _______________________________________________ > Haskell mailing list > [EMAIL PROTECTED] > http://www.haskell.org/mailman/listinfo/haskell -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/O6W1Yha8TWXIQwoRAi1DAKCti9nHfnh3oldHI438bdV+3OA29ACg1nK8 tpf9eANLv870A0xIPzNTsBU= =Sylz -----END PGP SIGNATURE----- _______________________________________________ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
