无法使用 usb4java lib 打开 HID 设备

问题描述

我正在尝试使用 usb4java lib 从 HID 设备打开和读取数据，但出现以下错误。

org.usb4java.LibUsbException：USB 错误 4：无法打开 USB 设备：没有这样的设备（可能已断开连接）

使用以下代码：

    DeviceList list = new DeviceList();
    Context context = new Context();

    int result = LibUsb.init(context);
    if (result < 0) {
        throw new LibUsbException("Unable to initialize libusb",result);
    }

    result = LibUsb.getDeviceList(context,list);
    if (result < 0) {
        throw new LibUsbException("Unable to get device list",result);
    }
    Device usbDevice = null;
    try {
        for (Device device : list) {
            DeviceDescriptor descriptor = new DeviceDescriptor();
            result = LibUsb.getDeviceDescriptor(device,descriptor);
            if (result == LibUsb.SUCCESS) {
                if (descriptor.idProduct() == 17 && descriptor.idvendor() == 1155) {
                    System.out.println("device : " + device.toString());
                    System.out.println("desc : " + descriptor.dump());
                    usbDevice = device;                        
                    LibUsb.freeDeviceList(list,false);
                    break;
                }
            }
        }
    } catch (Exception e) {
        e.printstacktrace();
    }
    if (usbDevice != null) {
        DeviceHandle handle = new DeviceHandle();
        result = LibUsb.open(usbDevice,handle);
        if (result != LibUsb.SUCCESS) {
            throw new LibUsbException("Unable to open USB device",result);
        }
        try {
            int attached = LibUsb.kernelDriverActive(handle,1);
            if (attached < 0) {
                throw new LibUsbException(
                        "Unable to check kernel driver active",result);
            }
            result = LibUsb.detachKernelDriver(handle,1);
            if (result != LibUsb.SUCCESS
                    && result != LibUsb.ERROR_NOT_SUPPORTED
                    && result != LibUsb.ERROR_NOT_FOUND) {
                throw new LibUsbException("Unable to detach kernel driver",result);
            }
            result = LibUsb.claimInterface(handle,1);
            if (result != LibUsb.SUCCESS) {
                throw new LibUsbException("Unable to claim interface",result);
            }
            result = LibUsb.releaseInterface(handle,1);
            if (result != LibUsb.SUCCESS) {
                throw new LibUsbException("Unable to release interface",result);
            }
            if (attached == 1) {
                LibUsb.attachKernelDriver(handle,1);
                if (result != LibUsb.SUCCESS) {
                    throw new LibUsbException(
                            "Unable to re-attach kernel driver",result);
                }
            }
            LibUsb.exit(null);
        } catch (Exception e) {
            e.printstacktrace();
        } finally {
            LibUsb.close(handle);
        }
    }

我的设备是 HID 条码扫描仪，以下是其描述符详细信息：

b长度：18

bDescriptorType : 1

bcdUSB：1.10

bDeviceClass : 0 每个接口

bDeviceSubClass : 0

bDeviceProtocol : 0

bMaxPacketSize0 : 64

id供应商：0x0483

产品编号：0x0011

bcdDevice：0.01 iManufacturer : 1

iProduct : 2

iSerial : 0

bNumConfigurations : 1

解决方法

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