Question

I am trying to open Weka from cmd line, using C#. This is the code that I’m using. It’s giving me an error for Weka.Start() line, and the error is : Win32 exception was unhandled. System cannot find the file specified. Please help me out. Thanks

 ProcessStartInfo WekaStartInfo = new ProcessStartInfo(@"C:\Program Files\Weka-    3-6\java -Xmx1536m -jar weka.jar");


        WekaStartInfo.UseShellExecute = false;
        WekaStartInfo.RedirectStandardOutput = true;
        WekaStartInfo.RedirectStandardError = true;
        WekaStartInfo.CreateNoWindow = false;

        Process Weka = new Process();
        Weka.StartInfo = WekaStartInfo;
        Weka.Start();
        string output = Weka.StandardOutput.ReadToEnd();
        Weka.WaitForExit();

Answer 1

There are two options to start WEKA from a
C# application.

1. In the WEKA install directory there is a
   batch file called RunWeka.bat. To start WEKA
   using this batch file use the following
   code:

   ProcessStartInfo wekaStartInfo = 
            new ProcessStartInfo(@"c:\Program Files\Weka-3-6\runweka.bat", "default");
   
   wekaStartInfo.WorkingDirectory = @"c:\Program Files\Weka-3-6";
   
   wekaStartInfo.UseShellExecute = false;
   wekaStartInfo.RedirectStandardOutput = true;
   wekaStartInfo.RedirectStandardError = true;
   wekaStartInfo.CreateNoWindow = false;
   
   using(Process weka = new Process())
   {
     weka.StartInfo = wekaStartInfo;
     weka.Start();
   }
   

2. To start WEKA without using the batch file
   use the following code:

   ProcessStartInfo wekaStartInfo = 
       new ProcessStartInfo(@"javaw", @"-classpath . RunWeka -i .\RunWeka.ini -w .\weka.jar -c default");
   
   wekaStartInfo.WorkingDirectory = @"c:\Program Files\Weka-3-6";
   wekaStartInfo.UseShellExecute = false;
   wekaStartInfo.RedirectStandardOutput = true;
   wekaStartInfo.RedirectStandardError = true;
   wekaStartInfo.CreateNoWindow = false;
   
   using(Process weka = new Process())
   {
     weka.StartInfo = wekaStartInfo;
     weka.Start();           
   }
   

In both cases you have to set the working directory.