New process continuous I/O Redirection

[ethemind]

Hi!

I'm writing a small program in C# that uses an external CYGWIN compiled console application. That application takes 5 seconds to initialize, but after it does, i can send some text and get response almoust instantly. That means I can send new parts of text again add again without restarting app, that programm continuously process its input. I will send lot of text parts to that program, so I decided to redirect it IO so I wont lose 5 sec per text-part of execution time. Here's the part of my code

p = new Process();              
ProcessStartInfo psI = new ProcessStartInfo(Directory.GetCurrentDirectory() + "\\tagger\\bin\\analyzer.exe");              
psI.UseShellExecute = false;              
psI.Arguments = " -f en.cfg --outf tagged";              
psI.RedirectStandardInput = true;              
psI.RedirectStandardOutput = true;              
psI.CreateNoWindow = false;              
psI.WorkingDirectory = Directory.GetCurrentDirectory() + "\\tagger\\bin\\";                        
p.StartInfo = psI;              
p.Start();              
sw = p.StandardInput;              
sr = p.StandardOutput;                      
sw.AutoFlush = true;

but I was really confused when I get known that I can read the program output ONLY after I close its input, so I cannot send anymore without restarting...
From MSDN:

 
// End the input stream to the sort command.           
// When the stream closes, the sort command           
// writes the sorted text lines to the            
// console.           
myStreamWriter.Close();  
 

Is ther any ways of avoiding that? I mean I need to be able to continuously write to that program and read its responses.
Thanx in advance!

[Plater]

Don't close the stream until you are done. I don't see what is not obvious about that?

[ethemind]

well, If I dont close the stream external program will not get stream's data. The problem is that after I close the stream I cannot reopen it without restarting external program.

[Plater]

Are you doing a Flush() on the stream to force the data to be written?
Once you close a redirected stream like that, it's gone. So closing it is not what you want to do I wouldn't think

[ethemind]

Flush doesnt sends any data here. Of course I tried.

[Plater]

Well I don't know what kind of strange setup you are using, it works for every program I've ever tried.
What do your commands look like?