[libusb] Need a simple working libusb code for keyboard input

[Jian Lu <jl...@co...>]

Hello there,
I'm a student working on libusb. I'm using the libusb 0.1, the old 
version. I'm trying to get a simple code that I can read the input from 
a keyboard. I tried to use usb_interrrupt_read(), but I always got an 
error code of -22 or -16.
Could you please help me out?

Thank you very much.
Best,
Jian Lu