Cannot find symbol!

[jackmarrow]

Hi all!
I've got this code and when I run it I get a lot of 'cannot find symbol' errors!

can anyone tell me why?

import javax.swing.*;
import javax.sound.midi.*;
import static javax.sound.midi.ShortMessage.*;

public class MidiMessageMapper {
  
  public static void main (String [] args) {
    
    MidiDevice.Info [] InputDeviceList = MidiSystem.getMidiDeviceInfo ();
    midiInfo = OutputFilter.filterOutputDevices (midiInfo, true /* select */);
    
    InputDeviceList = filterInputDevices (InputDeviceList, true);
    MidiDevice.Info InputDeviceInfo =
    (MidiDevice.Info)
    JOptionPane.showInputDialog (
                                 null,
                                 "Select MIDI Device",
                                 "Program Name",
                                 JOptionPane.QUESTION_MESSAGE,
                                 null,
                                 InputDeviceList,
                                 null);
    System.out.println("Selected device = " + InputdeviceInfo);
    
    //if (InputDeviceInfo != null) {
      
      
      MidiDevice.Info [] OutputDeviceList = MidiSystem.getMidiDeviceInfo ();
      midiInfo = InputFilter.filterInputDevices (midiInfo, true /* select */);
      
      OutputDeviceList = filterOutputDevices (OutputDeviceList, true);
      MidiDevice.Info OutputDeviceInfo =
      (MidiDevice.Info)
      JOptionPane.showInputDialog (
                                   null,
                                   "Select MIDI Device",
                                   "Program Name",
                                   JOptionPane.QUESTION_MESSAGE,
                                   null,
                                   OutputDeviceList,
                                   null);
      System.out.println("Selected device = " + OutputdeviceInfo);
      
      MidiMapperFrame gui = new MidiMapperFrame ("Kieran's Midi Mapper");
      
     // if (OutputDeviceInfo != null) {
      
      if (InputDeviceInfo != null && OutputDeviceInfo != null);
      
      try { 
        MidiDevice InputDevice = MidiSystem.getMidiDevice(InputDeviceInfo);
        Inputdevice.open ();
        MidiDevice OutputDevice = MidiSystem.getMidiDevice(OutputDeviceInfo);
        Outputdevice.open ();
        
        MessageByteBuffer myBuffer = new MessageBuffer();
        MessageBufferReceiver myReceiver  = new MessageBufferReceiver (myBuffer);
        Transmitter transmitter = InputDevice.getTransmitter();
        transmitter.setReceiver(myReceiver);
        
        while (true) { 
          byte [] message = buffer.get ();
          if (message != null) 
            {
              System.out.println (message[0]);
            }
          
          thread.yield();
        }
      }
      catch (MidiUnavailableException e) { 
        System.out.println ("Device not available"); 
      } 
      
    }
  }

[void]

Seeing at your code, I didn't find any problem with it. But then if you are saying that you are getting a lot of 'cannot find symbol' errors then can you provide us the exact error messages that you got, so that we can rectify and solve the problem appropriately.

[jackmarrow]

Line9
> midiInfo = OutputFilter.filterOutputDevices (midiInfo, true /* select */);

This has 3 'cannot find symbol' errors on it.