Java exec

Kevo

Hi,
I have a program which cannot run on windows. I have managed to get it to run in Cygwin and now I am hoping to call the program from a windows Java application using Runtime.exec. I know this is messy but I don't have the option of switching OS atm.


So what I need is to launch the cygwin terminal and pass new commands to that terminal in order to navigate to my program and execute it. Does anyone have examples of this?

My problem is that I can execute a command but I can't get any new output when inputting new commands.

I'll give an example using cmd instead of cygwin:

String line;
    OutputStream stdin = null;
    InputStream stderr = null;
    InputStream stdout = null;

      // launch EXE and grab stdin/stdout and stderr
      Process process = Runtime.getRuntime ().exec ("cmd.exe", new String [] {"/K"});
      stdin = process.getOutputStream ();
      stderr = process.getErrorStream ();
      stdout = process.getInputStream ();
  
      // a new command into cmd
      line = "dir" + "\n";   
      stdin.write(line.getBytes() );
      stdin.flush();

      stdin.close();
      
      // clean up if any output in stdout
      BufferedReader brCleanUp = 
        new BufferedReader (new InputStreamReader (stdout));
      while ((line = brCleanUp.readLine ()) != null) {
        //System.out.println ("[Stdout] " + line);
      }
      brCleanUp.close();
      
      // clean up if any output in stderr
      brCleanUp = 
        new BufferedReader (new InputStreamReader (stderr));
      while ((line = brCleanUp.readLine ()) != null) {
        //System.out.println ("[Stderr] " + line);
      }
      brCleanUp.close();

I don't get any errors. It just executes with no output.
Thanks

Edit: I have tried using both \n and \r and both in order to indicated carriage return when writing to the cmd process.

Rulmeq

This javaworld article from 2000 is the best place to go for ideas: http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html