Jules Bean wrote:
Marc Weber wrote:
On Tue, Sep 23, 2008 at 01:37:56PM +0200, Janis Voigtlaender wrote:
Hi,
assume I have a program taking input from stdin. How do I call it from Haskell while feeding to it a string as input.
Sure, have a look at http://hackage.haskell.org/packages/archive/process/1.0.0.0/doc/html/System-...
rnuInteractiveCommand does would you want (in,out,err,pId) <- runInteractiveProcess "cat" ... hPutStrLn "test" in hClose in outContents <- hGetContents out print outContents
Beware. The above code is broken.
Whether it appears to work depends on your OS, buffering settings, and the size of any underlying buffers.
Thanks for the warning. I needed it only for a small scripting task, and it seems to work well enough. Actually, I am not even interested in the output, so I just went for waitForProcess. This comes with additional warnings in the docs, but I did not experience any problems in my concrete setting so far. Ciao, Janis. -- Dr. Janis Voigtlaender http://wwwtcs.inf.tu-dresden.de/~voigt/ mailto:voigt@tcs.inf.tu-dresden.de