[Haskell-cafe] [Beginner's Question] How to read filenames from a DirStream

[Alec Berryman]

Albert Lee on 2007-04-09 10:46:14 +0800:

>  I want to ls the filenames of a directory.

[...]

>  and I write that in haskell:
>
>  -----
>  import System.Posix
>  import System.IO
>
>  main = do
>     dp <- openDirStream "/"
>     df <- readDirStream dp
>     putStrLn df
>     closeDirStream dp
>
>
>  ------
>  It can print the first entry of the dir, but how can we list it all like the
>  C prog?  map ? list comperhension?

System.Posix is one way to do it, but you might find the functions in
System.Directory easier to use -  there's a function to get the
directory contents as a list of strings.  To print them out, you may
want to look at one of the mapM functions.