コード例 #1
0
  public static UsbDevice findDevice(UsbHub usbHub) {
    for (UsbDevice device : usbHub.getAttachedUsbDevices()) {
      if (device.isUsbHub()) {
        device = findDevice((UsbHub) device);

        if (device != null) {
          return device;
        }
      } else {
        UsbDeviceDescriptor deviceDescriptor = device.getUsbDeviceDescriptor();
        if (deviceDescriptor.idVendor() == 0x0403 && deviceDescriptor.idProduct() == 0x6001) {
          return device;
        }
      }
    }

    return null;
  }
  /**
   * Find the specified device.
   *
   * <p>This method will look at child devices of hubs in effort to find the specified device.
   *
   * @param vendor the vendor ID of the requested device
   * @param product the product ID of the requested device
   * @param currDevice the current device being examined
   * @return the requested device or {@code null} if not found
   */
  private UsbDevice findDevice(int vendor, int product, UsbDevice currDevice) {
    if (currDevice.isUsbHub()) {
      UsbHub hub = (UsbHub) currDevice;
      @SuppressWarnings("unchecked")
      List<UsbDevice> attachedUsbDevices = (List<UsbDevice>) hub.getAttachedUsbDevices();
      for (UsbDevice child : attachedUsbDevices) {
        UsbDevice possible = findDevice(vendor, product, child);
        if (possible != null) {
          return possible;
        }
      }
    } else {
      UsbDeviceDescriptor desc = currDevice.getUsbDeviceDescriptor();
      if ((desc.idVendor() & 0xffff) == vendor && (desc.idProduct() & 0xffff) == product) {
        return currDevice;
      }
    }

    // Nothing matched at this level
    return null;
  }