Accessing usb through jusb

Question

hello,
when i am trying to accessing the usb through the jusb package an exception comes.plz help me
the code is as follows
import usb.core.*;
import usb.windows.*;
import usb.core.*;
import java.io.*;
public class ListUSB
public static void main(String[] args)
try
// Bootstrap by getting the USB Host from the HostFactory.
Host host = HostFactory.getHost();
// Obtain a list of the USB buses available on the Host.
Bus[] bus = host.getBusses();
int total_bus = bus.length;
// Traverse through all the USB buses.
for (int i=0; i<total_bus; i++)
// Access the root hub on the USB bus and obtain the
// number of USB ports available on the root hub.
Device root = bus.getRootHub();
int total_port = root.getNumPorts();
// Traverse through all the USB ports available on the
// root hub. It should be mentioned that the numbering
// starts from 1, not 0.
for (int j=1; j<=total_port; j++)
// Obtain the Device connected to the port.
Device device = root.getChild(j);
if (device != null)
                              System.out.println(" USB Available");
// Obtain the current Configuration of the device and the number of
// Interfaces available under the current Configuration.
Configuration config = device.getConfiguration();
int total_interface = config.getNumInterfaces();
// Traverse through the Interfaces
for (int k=0; k<total_interface; k++)
// Access the currently Interface and obtain the number of
// endpoints available on the Interface.
Interface itf = config.getInterface(k, 0);
int total_ep = itf.getNumEndpoints();
// Traverse through all the endpoints.
for (int l=0; l<total_ep; l++)
// Access the endpoint, and obtain its I/O type.
Endpoint ep = itf.getEndpoint(l);
String io_type = ep.getType();
boolean input = ep.isInput();
//                                   String io_type="lk";
                                        System.out.println(input);
                                        System.out.println(io_type);
// If the endpoint is an input endpoint, obtain its
// InputStream and read in data.
if (input)
//InputStream in;
                                        //DataInputStream dis=new DataInputStream(ep.getInputStream());
                                        InputStream dis=ep.getInputStream();//HERE EXCEPTION COMES AS ILLEGAL ARGUMENT EXCEPTION
                              System.out.println(input);
                                        // in.read();
//in = ep.getInputStream();
// Read in data here
                                             byte b[] =new byte[100];
                                             dis. read(b);
                                             System.out.println("The Message is"+b);
                                             dis.close();
// If the Endpoint is and output Endpoint, obtain its
// OutputStream and write out data.
else
OutputStream out;
out = ep.getOutputStream();
// Write out data here.
out.close();
                         else
                              System.out.println("USB not Available");
} catch (Exception e)
e.printStackTrace();

Answer 1

I had download the JUSB-API from www.Bubensoft.de , i manage to install the driver but when i compile and run the above java code
import com.rb.usb.*;
public class Test implements PipeListener{
private static JDevice jDevice;
boolean terminate = false;
private static Pipe event;
private static ConfigurationDescriptor configNumber ;
public static void Test() {
int host=JUSB.scanHostControllers();
System.err.println(host);
// System.err.println(JUSB.getJDevices());
// System.err.println(JUSB.findDevice("vid_05e0&pid_1200"));
jDevice= (JDevice) JUSB.findDevice("vid_05e0&pid_1200");
//jDevice.traceDriverOn();
//JUSB.open(jDevice.getDevicePath());
// System.err.println(configNumber.getConfigurationValue());
jDevice.close();
jDevice.open();
JUSB.open(jDevice.getHardwareId());
System.err.println(jDevice.isJDevice());
System.err.println(jDevice.getHandle());
System.err.println(jDevice.isConfigured());
System.err.println(jDevice.getPipe(0));
public void pipeEvent(PipeEvent event) {
          switch (event.getId()) {
               case PipeEvent.DESTROYED:
                    terminate=true;
                    break;
               case PipeEvent.RECEIVED:
                    System.out.println("" + event.getData().length + " Bytes empfangen");
                    break;
               case PipeEvent.SEND:
                    System.out.println("" + event.getData().length + " Bytes gesendet");
                    break;
               default:
                    break;
public static void main (String[]args)
Test();
System.exit(0);
i get this output
*3*
true
-1
false
null
can any one tell me why the jDevice is not open?