Hi. I want to write a little haskell program executing about 4 programs passing data via pipes. As my python script seems to be slower than a bash script I want to try a ghc executable now. It should invoke different parts of a text to speech chain. This way I have one interface then.
Talar und #haskell told me that I might use runProcess and pass handles for stdin and out created by createPipe and fdToHandle. So my simple test looks like this: module Main where import System.IO import System.Posix.IO main = do (fdIn,fdOut) <- createPipe let (iohIn, iohOut) = (fdToHandle fdIn, fdToHandle fdOut) hIn <- iohIn hOut <- iohOut hPutStr hIn "test" line <- hGetLine hOut print line -- should now print test having been piped through my pipe but I get the error: pipe2: <file descriptor: 3>: hPutStr: illegal operation (handle is not open for writing) And in current CVS docs in base.System.Process.hs it is said that createPipe is no longer exported ? I've also found this library: http://www.haskell.org/communities/11-2005/html/report.html#processlib which seems to do something similar but is meant to pipe haskell types between different threads (? I haven't understood what's going on there because I can't understand Russian ;-) Is this of any help for me? Greetings Marc _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
