thanks for your replay.
i run the two program in two different teriminal for sure.

it works for you?
but why can't run well on my computer.

make me creazy....

2014-05-21 13:47 GMT+08:00 Bob Ippolito <bob@redivi.com>:

How precisely are you trying to run the client? Are you typing it in to the same terminal? If so, then the client is never actually started, because when you type ./cli the input is going to ./serv and not the shell. Try running the client in a separate terminal.

It works for me here on Mac OS X 10.9.2 with GHC 7.8.2.

On Tue, May 20, 2014 at 10:42 PM, yang.zhao <hckjsnzf@gmail.com> wrote:

hi guys,
I'm newbie, just begin to learn Haskell.
now i write a very simple server and client .

Server:
import Control.Concurrent 
import System.IO          
import Network            
                          
port :: Int               
port = 1234               
                          
main :: IO ()             
main = withSocketsDo $ do 
    s <- listenOn $ PortNumber $ fromIntegral port
    (h, _, _) <- accept s 
                          
    sline <- hGetLine h   
    hPutStrLn h sline     
    putStrLn $ "send "++sline
    threadDelay 1000000   
                          
    hClose h              
    sClose s

Client :
import System.IO
import Network
 
port :: Int
port = 1234
 
main :: IO ()
main = withSocketsDo $ do
    h <- connectTo "localhost" $ PortNumber $ fromIntegral port
    hPutStrLn h "hello"
    bs <- hGetContents h
    putStrLn bs
    hClose h
 

And, it doesn't work now . I run ./serv , then run ./cli , they will block all the time.
but,  when i run ./serv, and telnet localhost 1234 in another terminal, it works fine.
so i don't know what's the wrong with my code.
anybody can tell me about my problem?

os is Debian 7,  haskell-platform  2012.2.0.0

thanks a lot!!!
--
K.I.S.S.

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