Re: hidapi: does not retrieve serial number of device on macos x

[folkert <fo...@va...>]

> > The code of the (original) cleware c++ library does:
> >
> >                                         int strInc = (s[1] == 0) ? 2 : 1 ;
> >                                         for ( ; *s ; s+=strInc) {
> >  // unicode byte 2 == 0
> >                                                 if (*s >= '0' && *s <= '9')
> >                                                         SerNum =
> > SerNum * 16 + *s - '0' ;
> >                                                 else if (*s >= 'A' && *s <= 'F')
> >                                                         SerNum =
> > SerNum * 16 + *s - 'A' + 10 ;
> >                                                 }
> >
> > So I think that some use plain ascii while others may use UTF-16 (with
> > high byte set to 0x00).
> 
> You should use the wide character functions. HIDAPI will give you a
> wchar_t, with which you could use something like wcstol().

Yes. This was an example of how things were done on Linux to show that
the device might return utf-16.

> I'm less interested in what the PC-side does than what the firmware
> does. Can you send your string descriptor (as a fragment of your firmware)?

Hope I understood you but on the Mac that's a 0-bytes string and on
Linux I receive:

30 30 30 31 30 36 41 00 00 00 00 00
30 30 30 31 37 35 43 00 00 00 00 00
30 30 30 32 33 44 39 00 00 00 00 00

these are the first 16 bytes in the buffer as returned by the
HIDIOCGSTRING ioctl executed.

Unfortunately I don't have access to the source code of the devices
themselves.

> Have you tried putting a normal string for the serial number in the
> firmware (like hard-coding to "ASDF") and seeing if that makes it
> through?

I'm not working for Cleware so I don't have access to what is needed for
that.

> Are you able to see serial numbers from other devices?

But that is definately something I can answer: yes, on both macs on
which tests took place (using the testtool from hidapi) we saw serial
numbers from other devices.


Folkert van Heusden

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