[Mono-devel-list] System.Diagnostics.Process redirection

[Colin JN Breame]

On Sunday 03 Jul 2005 16:45, John Bailo wrote:
>
> 1. Have you tried adding a catch so you can see any errors that might be
> thrown?   You have that code nested in a try -- but no cache.

Yes I have - I've tried both a catch and a finally block around the suspect 
line.  It really is exiting at that point.

>
> 2. Have you stepped it through monodevelop?

I don't have monodevelop installed.  I would be grateful if someone else could 
try the program to see if they get the same result.

>
> 3. I know from Windows .NET that the methods for monitoring the state, and
> completion of a Process is somewhat ill-defined.   Yes, there are several
> sample code examples but some say different things.   For a project I did
> that send an lpr command, I ended up doing two things.
>
> Set a new Process equal to the actual process and monitor that as a kind of
> "handle".   Two, put in a Thread.Sleep to give  process a chance to "clean
> up".   There seems to be some long disconnect between when the process
> 'stops' and when it 'really stops'.
>
> At least that has been my experience w/Windows.NET
>
> > .
> >
> > Any ideas what might be going on here?  Could this be SIGPIPE related?
> >
> >  -- Colin
> >
> > ps. mono 1.1.8.1
> >
> >
> >
> > using System;
> > using System.IO;
> > using System.Diagnostics;
> >
> > public class main_t {
> >
> >         public static void Main() {
> >                 while (true) {
> >                         run();
> >                 }
> >         }
> >
> >         public static void run() {
> >                 Process p = null;
> >
> >                 try {
> >                         p = new Process();
> >
> >                         string pipe = "echo hello";
> >
> >                         int i = pipe.IndexOf(' ');
> >                         if (i == -1) {
> >                                 p.StartInfo.FileName = pipe;
> >                         } else {
> >                                 p.StartInfo.FileName = pipe.Substring(0,
> > i); p.StartInfo.Arguments = pipe.Substring(i+1, pipe.Length-i-1);
> >                         }
> >
> >                         p.StartInfo.UseShellExecute = false;
> >                         p.StartInfo.RedirectStandardInput = true;
> >                         try {
> >                                 p.Start();
> >                         } catch (Exception e) {
> >                                 Console.Error.WriteLine("could not
> > execute: {0}", pipe);
> >                                 goto init_error;
> >                         }
> >
> >                         TextWriter stdout = Console.Out;
> >                         Console.SetOut(p.StandardInput);
> >                         stdout.WriteLine("1");
> >                         p.StandardInput.WriteLine("hello world!");
> >                         stdout.WriteLine("2");
> >                         Console.SetOut(stdout);
> >
> >                         p.StandardInput.Close();
> >
> >                         if (p != null) {
> >                                 p.WaitForExit();
> >                         }
> >
> >                 } finally {
> >                         if (p != null) p.Close();
> >                 }
> >         init_error:;
> >         }
> > }
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>
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