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
-------- Original-Nachricht --------
> Datum: Fri, 26 Oct 2012 19:10:25 +0800
> Von: Xiaofan Chen <xiaof...@gmail.com>
> An: libusbx-devel@lists.sourceforge.net
> Betreff: Re: [Libusbx-devel] Bug in get_string_descriptor?
> On Fri, Oct 26, 2012 at 6:21 PM, Stefano Di Martino <stefan...@gmx.net>
> wrote:
> > Hi,
> > I have the strange problem, that when I'm using pyUSB with libusbx as
> backend I get the error "Insufficient memory".
> > I tried to use then libusbx directly and it end up in an similar error:
> >
> > "ERROR in retrieving string descriptor: LIBUSB_ERROR_NO_MEM"
> >
> > I have extended listdev.c:
> >
> > // ...
> > char data[50];
> >
> > ret = libusb_get_string_descriptor_ascii(handle, desc.iManufacturer,
> (unsigned char*) data, 29);
> >
> > if (ret < 0) {
> > const char *error = libusb_error_name (ret);
> > printf("ERROR in retrieving string descriptor: %s\n", error);
> > exit(1);
> > }
> >
> >
> > I get an similar error when I'm using xusb.c:
> >
> > Reading string descriptors:
> > libusbx: warning [auto_claim] program assertion failed - autoclaim_count
> was nonzero
> > libusbx: warning [auto_claim] program assertion failed - autoclaim_count
> was nonzero
> >
> > I'm using the dll of libusbx-1.0.14 for Windows.
> > Any ideas?
>
> The warnings are just a warning and may not be the real problem. You
> should post more debug logs.
>
>
> --
> Xiaofan
>
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