Sorry, I forgot to post the error message when I'm using pyUSB:
"usb.core.USBError: [Errno 12] Insufficient memory"
Regards
Stefano
-------- Original-Nachricht --------
> Datum: Fri, 26 Oct 2012 10:40:30 +0200
> Von: "Stefano Di Martino" <stefan...@gmx.net>
> An: pyusb-users@lists.sourceforge.net
> Betreff: [pyusb-users] Getting string descriptor
> Hi anyone,
> for some reason I can't get the string descriptor of an device:
>
> # ...
> for device in devices:
> if device.iManufacturer > 0:
> string = usb.util.get_string(device, 254,
> device.iManufacturer)
> print "string:", string
> else:
> print "no descriptor"
>
> My backend is the latest libusbx-1.0.14-win.
>
> I get a similar error when I'm using C directly:
>
> unsigned char *data = malloc(30);
> ret = libusb_get_string_descriptor_ascii(handle, desc.iManufacturer, data,
> 29);
>
> if (ret < 0) {
> const char *error = libusb_error_name(ret);
> printf("ERROR in retrieving string descriptor: %s\n", error);
> exit(1);
> }
>
>
> The error message:
> "ERROR in retrieving string descriptor: LIBUSB_ERROR_NO_MEM"
>
> Might this be a bug in libusbx?
>
> Best regards
> Stefano
>
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