I am student of Computer engineering dept of YeungNam University in Korea.
First, sorry about my poor english skill.
I need help, please.
I found USB API for Java.
I need USB device's PID, VID and unique serial number because I need to do identify each USB device for my project(just mass storage device).
I use below example code.
(This is usb4java API example code.)
This code show me some information about USB HUDs, connected devices.
package org.usb4java.javax.examples;
import java.io.UnsupportedEncodingException;
import java.util.List;
import javax.usb.UsbConfiguration;
import javax.usb.UsbDevice;
import javax.usb.UsbDisconnectedException;
import javax.usb.UsbEndpoint;
import javax.usb.UsbException;
import javax.usb.UsbHostManager;
import javax.usb.UsbHub;
import javax.usb.UsbInterface;
import javax.usb.UsbPort;
import javax.usb.UsbServices;
/**
* Dumps all devices by using the javax-usb API.
*
* @author Klaus Reimer <k@ailis.de>
*/
public class DumpDevices
{
/**
* Dumps the specified USB device to stdout.
*
* @param device
* The USB device to dump.
*/
private static void dumpDevice(final UsbDevice device)
{
// Dump information about the device itself
System.out.println(device);
final UsbPort port = device.getParentUsbPort();
if (port != null)
{
System.out.println("Connected to port: " + port.getPortNumber());
System.out.println("Parent: " + port.getUsbHub());
}
// Dump device descriptor
System.out.println(device.getUsbDeviceDescriptor());
// Process all configurations
for (UsbConfiguration configuration: (List<UsbConfiguration>) device
.getUsbConfigurations())
{
// Dump configuration descriptor
System.out.println(configuration.getUsbConfigurationDescriptor());
// Process all interfaces
for (UsbInterface iface: (List<UsbInterface>) configuration
.getUsbInterfaces())
{
// Dump the interface descriptor
System.out.println(iface.getUsbInterfaceDescriptor());
// Process all endpoints
for (UsbEndpoint endpoint: (List<UsbEndpoint>) iface
.getUsbEndpoints())
{
// Dump the endpoint descriptor
System.out.println(endpoint.getUsbEndpointDescriptor());
}
}
}
System.out.println();
// Dump child devices if device is a hub
if (device.isUsbHub())
{
final UsbHub hub = (UsbHub) device;
for (UsbDevice child: (List<UsbDevice>) hub.getAttachedUsbDevices())
{
dumpDevice(child);
}
}
}
/**
* Main method.
*
* @param args
* Command-line arguments (Ignored)
* @throws UsbException
* When an USB error was reported which wasn't handled by this
* program itself.
*/
public static void main(final String[] args) throws UsbException
{
// Get the USB services and dump information about them
final UsbServices services = UsbHostManager.getUsbServices();
System.out.println("USB Service Implementation: "
+ services.getImpDescription());
System.out.println("Implementation version: "
+ services.getImpVersion());
System.out.println("Service API version: " + services.getApiVersion());
System.out.println();
// Dump the root USB hub
dumpDevice(services.getRootUsbHub());
}
}
and this code result like this:
USB Service Implementation: usb4java
Implementation version: 1.2.0
Service API version: 1.0.2
usb4java root hub 1.0.0
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.01
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0xffff
idProduct 0xffff
bcdDevice 0.00
iManufacturer 1
iProduct 2
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 18
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
bMaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Bus 002 Device 007: ID 203a:fffa
Connected to port: 1
Parent: usb4java root hub 1.0.0
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 Per Interface
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x203a
idProduct 0xfffa
bcdDevice 1.00
iManufacturer 1
iProduct 2
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 1
bmAttributes 0xc0
Self Powered
bMaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 7 Printer
bInterfaceSubClass 1
bInterfaceProtocol 1
iInterface 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 512
bInterval 0
.
.
.
.
Bus 002 Device 003: ID 152d:2329
Connected to port: 3
Parent: usb4java root hub 1.0.0
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 Per Interface
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x152d
idProduct 0x2329
bcdDevice 1.00
iManufacturer 1
iProduct 2
iSerial 5
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4
bmAttributes 0xc0
Self Powered
bMaxPower 2mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6
bInterfaceProtocol 80
iInterface 6
.
.
.
.
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 512
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 512
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 512
bInterval 0
In result of code, there is mass storage and I can see PID and VID, but there is iserialnumber(index of serial number in device descriptor) instead of real serialnumber.
I think that to identify each USB mass storage device, need combination of PID, VID, S/N.
How can I get serial number?
In Usb4Java, Javax.usb, libusb, these APIs not include methods like 'getSerialnumber()'.
Help me please.
Best Answer
The "iSerial" is the index of the version string in the device's string table. You can retrieve the corresponding string using the
getString(byte)method on the device. Same thing goes for "iManufacturer" and "iProduct".Keep in mind that not all devices will have a unique serial number.