On Fri, Oct 26, 2012 at 8:05 PM, Stefano Di Martino <stefan...@gmx.net> wrote:
> Here the debug log what I actived before I call 
> libusb_get_string_descriptor_ascii()
>
> [timestamp] [threadID] facility level [function call] <message>
> --------------------------------------------------------------------------------
> [ 0.953095] [00000b1c] libusbx: debug [composite_submit_control_transfer] 
> using interface
> 3
> [ 0.953095] [00000b1c] libusbx: debug [libusb_claim_interface] interface 3
> [ 0.953095] [00000b1c] libusbx: debug [hid_claim_interface] claimed interface 
> 3
> [ 0.953095] [00000b1c] libusbx: debug [libusb_get_config_descriptor] index 0
> [ 0.953095] [00000b1c] libusbx: debug [parse_endpoint] skipping descriptor 25
> [ 0.953095] [00000b1c] libusbx: debug [parse_endpoint] skipping descriptor 25
> [ 0.953095] [00000b1c] libusbx: debug [parse_endpoint] skipping descriptor 25
> [ 0.953095] [00000b1c] libusbx: debug [windows_assign_endpoints] (re)assigned 
> endpoint 83
> to interface 3
> [ 0.953095] [00000b1c] libusbx: debug [auto_claim] auto-claimed interface 3 
> for control re
> quest
> [ 0.953095] [00000b1c] libusbx: debug [hid_submit_control_transfer] will use 
> interface 3
>
> ERROR in retrieving string descriptor: LIBUSB_ERROR_NO_MEM

You may want to post a small prorgam to demonstrate the problem and post
the full debug log. The above does not say much. But it seems to me your
device is a USB composite device with one of the interface to be HID.

You can try xusb example against your device and post the debug log first.

-- 
Xiaofan

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