[Libusb-devel] Doubt on using usb_get_descriptor

[Isabella <isa...@ja...>]

Hi all,
   Can any one clarify my doubt in below libusb function?


1) unsigned char type-> descriptor type
(example device desc-> 1, config desc-> 2...)

2)  unsigned char index -->??????????
I don't know the index value.

int usb_get_descriptor(usb_dev_handle *dev, unsigned char type, unsigned
char index, void *buf, int size);


Thanks,
Isabella.S