Oops - meant to say "Controlling Legacy DOS program from Java ..."

Question

Sorry - don't know what I wasn't thinking - muddled up my post title!
As part of my final year project, I'm trying to control a camera mount automatically using stepper motors. This will then be used for robotic navigattion. Most of my code is written in Java, but I have been given some old C code to control the motors with. One loaded, it sits in an infinite loop that waits for keyboard input, resonds, loops, and so on ...
I'm trying desperately to find a way of issuing commands to this program from my Java programs. I tried to implement a listening server in the C code but got a bit bogged down. Now wonder if I can use the
exec and getOutputStream methods in Java to control the Dos program...?
Any ideas very very welcome. I've reached hair pulling out time!
Ben Barker

Answer 1

Everything is now woeking...ish:
I can now make the below java program bring up, for instance, windows calculator or notepad.
I can't test it on the main code yet at I don't have the right computer in front of me. However, I decided to try to test it by runing cmd using ...exec("cmd"), then printing a command to the output stream to make windows calculator run. This caused precisely nothing to happen ...
Any ideas?
import java.io.*;
class java_test
public static void main(String[] args)
          try
          Process p= Runtime.getRuntime().exec("cmd");
          InputStream is= p.getInputStream();
          OutputStream os= p.getOutputStream();
          PrintStream printStr = new PrintStream(os);     
          printStr.println("calc.exe");
          catch (Throwable t)
          t.printStackTrace();
}