i have a magnetic swipe card reader with usb port to connect with pc. i am trying to read data through usb getting exceptions

[bhuvan]

hi guys,
i have a magnetic swipe card reader with usb port to connect with pc. i am trying to read data through usb getting exceptions. once i connected device to pc my os is windows 7 so it is automatically installing some drivers to it. in device manager it show two usb interfaces with same vid and pid.
Device dev = USB.getDevice((short) 0x5131, (short) 0x2007);
try {
// data to write to the device

  // data read from the device
  byte [] readData= new byte[20];

  // open the device with configuration 1, interface 0 and without
  // altinterface
  // this will initialise Libusb for you
  dev.open(1, 0, -1);
  System.out.println("port open or not : "+dev.isOpen());
  // write some data to the device
  // 0x03 is the endpoint address of the OUT endpoint 3 (from PC to
  // device)

// dev.writeInterrupt(0x03, data, data.length, 2000, false);
// read some data from the device
// 0x84 is the endpoint address of the IN endpoint 4 (from PC to
// device)
// bit 7 (0x80) is set in case of an IN endpoint
dev.readInterrupt(0x81, readData, readData.length, 2000, false);
// log the data from the device
logData(readData);
// close the device
dev.close();
} catch (USBException e) {
// if an exception occures during connect or read/write an exception
// is thrown
e.printStackTrace();
}
}

and i am getting following exception.

ch.ntb.usb.USBException: USB device with idVendor: 0x5131, idProduct: 0x2007, busName: null, filename: null not found on USB
at ch.ntb.usb.Device.open(Device.java:234)
at Quindell.EPOS.TestCardReadingClass.main(TestCardReadingClass.java:29)

any help will be more appreciable..thanks in advanceee

[uniederer]

Did you have a look if the device shows up in the TreeView demo? Do you plug it in on an USB3 port?

[bhuvan]

@uniederer. i done few research now and able to open usb port but when i swiped the card through reader it is raising an exception.here is my updated code.

import ch.ntb.usb.Device;
import ch.ntb.usb.LibusbJava;
import ch.ntb.usb.USB;
import ch.ntb.usb.USBException;
import ch.ntb.usb.Usb_Bus;
import ch.ntb.usb.Utils;
public class TestCardReadingClass
{
      private static void logData(byte[] data) 
   {
        System.out.print("Data: ");
        for (int i = 0; i < data.length; i++) {
          System.out.print("0x" + Integer.toHexString(data[i] & 0xff) + " ");
}
System.out.println();

}
/*
* @param args
* @throws USBException
/

private static void ReadData() throws USBException

{
Device dev = USB.getDevice((short) 0x5131, (short) 0x2007);
try
{
byte[] readData = new byte[20];

      // open the device with configuration 1, interface 0 and without
          // altinterface
          // this will initialise Libusb for you
          dev.open(1, 0,-1);
          System.out.println("port open or not : "+dev.isOpen());
          int altinterface=dev.getAltinterface();
          int pid=dev.getIdProduct();
          int vid=dev.getIdVendor();
          int psize= dev.getMaxPacketSize();
          int interfac = dev.getInterface();
          int config = dev.getConfiguration();
          int xx=dev.hashCode();
          System.out.println("Device pid : "+pid);
          System.out.println("Device vid : "+vid);
          System.out.println("Device psize : "+psize);
          System.out.println("Device hashcode : "+xx);
          System.out.println("Device Configuration : "+config);
          System.out.println("Device Altinterface : "+altinterface);
          System.out.println("Device interface : "+interfac);

          // read some data from the device
          // 0x84 is the endpoint address of the IN endpoint 4 (from PC to
          // device)
          // bit 7 (0x80) is set in case of an IN endpoint
          dev.readBulk(0x82, readData, readData.length, 11111111, false);
           //System.out.println("ReadData value:"+readData.toString());
          //dev.readInterrupt(0x82, readData, readData.length, 100000, true);
          // log the data from the device
          logData(readData);

          // close the device
          dev.close();
} catch (USBException e)
{
          // if an exception occures during connect or read/write an exception
          // is thrown

          e.printStackTrace();
          dev.close();
}

}

private static boolean LogBus(){

boolean islogged =false;
try{
LibusbJava.usb_init();
LibusbJava.usb_find_busses();
LibusbJava.usb_find_devices();

// retrieve a object tree representing the bus with its devices and
// descriptors
Usb_Bus bus = LibusbJava.usb_get_busses();
Utils.logBus(bus);
islogged=true;
}
catch(Exception e){
  e.printStackTrace();
}

// log the bus structure to standard out

return islogged;

}

public static void main(String[] args) throws USBException
{
  boolean islog=LogBus();
  if (islog)
  {
  ReadData();
  }else
    System.out.println("Is Bus Logged Succesfully :"+islog);
 }

---

OUTPUT

Usb_Bus bus-0
Usb_Device \.\libusb0-0002--0x5131-0x2007
Usb_Device_Descriptor idVendor: 0x5131, idProduct: 0x2007
Usb_Config_Descriptor bNumInterfaces: 0x1
Usb_Interface num_altsetting: 0x1
Usb_Interface_Descriptor bNumEndpoints: 0x2
Usb_Endpoint_Descriptor bEndpointAddress: 0x82
Usb_Endpoint_Descriptor bEndpointAddress: 0x2
Usb_Device \.\libusb0-0003--0x5131-0x2007
Usb_Device_Descriptor idVendor: 0x5131, idProduct: 0x2007
Usb_Config_Descriptor bNumInterfaces: 0x1
Usb_Interface num_altsetting: 0x1
Usb_Interface_Descriptor bNumEndpoints: 0x1
Usb_Endpoint_Descriptor bEndpointAddress: 0x81
port open or not : true
Device pid : 8199
Device vid : 20785
Device psize : 64
Device hashcode : 216072924
Device Configuration : 1
Device Altinterface : -1
Device interface : 0
ch.ntb.usb.USBTimeoutException: LibusbJava.usb_bulk_read: libusb0-dll:err [_usb_reap_async] reaping request failed, win error: The I/O operation has been aborted because of either a thread exit or an application request.

        at ch.ntb.usb.Device.readBulk(Device.java:398)
        at TestCardReadingClass.ReadData(TestCardReadingClass.java:63)
        at TestCardReadingClass.main(TestCardReadingClass.java:114)

}

Thanks in advance.....

[bhuvan]

@uniederer.. i had usb port 3.0 to my laptop but i am not connected device to it . connected device to usb 2.0 only.. thanks for your reply