Permission Errors when opening device (Using Windows 10)

[Matt]

Hi everyone,

I'm working on a small Java project (my Programming knowledge is still a work in progress...). I require to read in from a USB device on a Windows 10 machine. I've used the quick start guide for The low-level (libusb) API and that has been very helpful.

I've been stuck on a problem for numerous days now and I'm not getting very far. I'm sure it's probably something easy, but with my experience I'm stuck.

When I run the LibUsb.open(device, Handle) I receive the following error: USB error 3: Unable to open USB device: Access denied (insufficient permissions).

As per the help pages and other questions I ran the zadig program and that did fix some previous issues I was having, but I can't seem to get around this one and the solution I haven't been able to find online. Hoping someone could help me?

I've been using eclipse. Thanks for any support you can give me.

Matt

Sample Code below

       public void actionPerformed(ActionEvent arg0) {
     //Initialize the libusb
            context = new Context();
            int result = LibUsb.init(context);
            if (result != LibUsb.SUCCESS) {
                throw new LibUsbException("Unable to initialize libusb.", result);
            }
            //Find the Device on the System
            short vendorId = (short)1545;
            short productId = (short)797;
            Device device = findDevice(vendorId,productId);
            DeviceHandle handle = new DeviceHandle();
            result = LibUsb.open(device, handle);

            if (result != LibUsb.SUCCESS) {
 //This fails with USB error 3: Unable to open USB device: Access denied (insufficient permissions).
                throw new LibUsbException("Unable to open USB device", result);
            }
            try
            {
                // Use device handle here
            }
            finally
            {
                LibUsb.close(handle);
            }          
            LibUsb.exit(context);
        }
    public Device findDevice(short vendorId, short productId)
{
    // Read the USB device list
    DeviceList list = new DeviceList();
    int result = LibUsb.getDeviceList(null, list);
    if (result < 0) throw new LibUsbException("Unable to get device list", result);
    try
    {
        // Iterate over all devices and scan for the right one
        for (Device device: list)
        {
            DeviceDescriptor descriptor = new DeviceDescriptor();
            result = LibUsb.getDeviceDescriptor(device, descriptor);
            if (result != LibUsb.SUCCESS) throw new LibUsbException("Unable to read device descriptor", result);
            if (descriptor.idVendor() == vendorId && descriptor.idProduct() == productId) {
                System.out.println("Found Device!");
                return device;
            }
        }
    }
    finally
    {
        // Ensure the allocated device list is freed
    }
    // Device not found
    return null;
}

[Matt]

I tried completing a simply read from a USB device with both the low-level (libusb) API and the high-level (javax-usb) API and I receive similar permission errors. Has anyone gotten Usb4Java to work on Windows 10? I'm having a hard time finding any example that is not directly running from C or using Java from Linux.

Just curious if anyone has a working example for Windows 10? No idea how to get around the issue I'm having.

[Awais Akhtar]

Hi Matt, 

did it work for you on windows? getting same problem with permission.