libusb: 0.000000 error [winusb_claim_interface] could not access interface 0: [1] Incorrect function.

[John C. <jo...@gm...>]

Hi,Gurus,

I am using libusb-1.0.9,  I already installed windows driver and can see
the information from Device Manager, Just try to get serial number from the
USB Device, it failed at libusb_get_string_descriptor_ascii



The code is as following:



       libusb_device **devs;

       libusb_device *dev;

       int cnt = libusb_get_device_list(NULL, &devs);

       int i = 0;







       while ((dev = devs[i++]) != NULL)

       {

             int r = libusb_get_device_descriptor(dev, desc);

             if (r ==0)

             {

                    if (desc->idProduct==pid && desc->idVendor==vid)

                    {

       r=libusb_open(dev,&m_handle );//this code succeeded.

                           libusb_set_debug(NULL,3);

     unsigned char sSerial[256];

                            r=libusb_get_string_descriptor_ascii( m_handle,
desc->iSerialNumber, sSerial, 255 ); //this code is always faile with
return code 5.

                           const char* error = libusb_error_name(r); //error
= 0x00180e74 "LIBUSB_ERROR_NOT_FOUND"

                    }

             }



       }







 The log is as following:



libusb: 0.000000 error [winusb_claim_interface] could not access interface
0: [1] Incorrect function.

libusb: 0.001500 error [winusb_claim_interface] could not claim interface
0: [1] Incorrect function.

libusb: 0.003001 warning [winusb_claim_interface] failed to auto-claim
interface 0 (required to claim 1 with WinUSB)



…

libusb: 0.007001 warning [winusb_claim_interface] failed to auto-claim
interface 0 (required to claim 31 with WinUSB)



libusb: 0.045509 error [auto_claim] could not auto-claim any interface

libusb: 0.046009 error [winusb_claim_interface] could not access interface
0: [1] Incorrect function.

libusb: 0.047009 error [winusb_claim_interface] could not claim interface
0: [1] Incorrect function.

libusb: 0.047509 warning [winusb_claim_interface] failed to auto-claim
interface 0 (required to claim 1 with WinUSB)

libusb: 0.047509 warning [winusb_claim_interface] failed to auto-claim
interface 0 (required to claim 31 with WinUSB)





Please advice.

Thanks.

John