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Re: Chardet, file, ... and the Flexible String Representation

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On Sep 9, 2013 12:36 PM, <random832@fastmail.us> wrote:
>
> On Fri, Sep 6, 2013, at 13:04, Chris Angelico wrote:
> > On Sat, Sep 7, 2013 at 2:59 AM,  <random832@fastmail.us> wrote:
> > > Incidentally, how does all this interact with ctypes unicode_buffers,
> > > which slice as strings and must be UTF-16 on windows? This was fine
> > > pre-FSR when unicode objects were UTF-16, but I'm not sure how it
would
> > > work now.
> >
> > That would be pre-FSR *with a Narrow build*, which was the default on
> > Windows but not everywhere. But I don't know or use ctypes, so an
> > answer to your actual question will have to come from someone else.
>
> I did a couple tests - it works as well as can be expected for reading,
> but completely breaks for writing (due to sequence size checks not
> matching)

Do you mean that it breaks when overwriting Python string object buffers,
or when overwriting arbitrary C strings either received from C code or
created with create_unicode_buffer?

If the former, I think that is to be expected since ctypes ultimately can't
know what is the actual type of the pointer it was handed -- much as in C,
that's up to the programmer to get right. I also think it's very bad
practice to be overwriting those anyway, since Python strings are supposed
to be immutable.

If the latter, that sounds like a bug in ctypes to me.

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Chardet, file, ... and the Flexible String Representation wxjmfauth@gmail.com - 2013-09-06 02:11 -0700
  Re: Chardet, file, ... and the Flexible String Representation Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-06 10:57 +0000
  Re: Chardet, file, ... and the Flexible String Representation Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-06 13:10 +0200
  Re: Chardet, file, ... and the Flexible String Representation Ned Batchelder <ned@nedbatchelder.com> - 2013-09-06 07:02 -0400
  Re: Chardet, file, ... and the Flexible String Representation Piet van Oostrum <piet@vanoostrum.org> - 2013-09-06 11:46 -0400
    Re: Chardet, file, ... and the Flexible String Representation Chris Angelico <rosuav@gmail.com> - 2013-09-07 02:04 +1000
    Re: Chardet, file, ... and the Flexible String Representation random832@fastmail.us - 2013-09-06 12:59 -0400
    Re: Chardet, file, ... and the Flexible String Representation Chris Angelico <rosuav@gmail.com> - 2013-09-07 03:04 +1000
    Re: Chardet, file, ... and the Flexible String Representation wxjmfauth@gmail.com - 2013-09-09 07:28 -0700
      Re: Chardet, file, ... and the Flexible String Representation Ned Batchelder <ned@nedbatchelder.com> - 2013-09-09 12:38 -0400
      Re: Chardet, file, ... and the Flexible String Representation Michael Torrie <torriem@gmail.com> - 2013-09-09 11:05 -0600
        Re: Chardet, file, ... and the Flexible String Representation Steven D'Aprano <steve@pearwood.info> - 2013-09-10 04:58 +0000
      Re: Chardet, file, ... and the Flexible String Representation Terry Reedy <tjreedy@udel.edu> - 2013-09-09 16:47 -0400
      Re: Chardet, file, ... and the Flexible String Representation random832@fastmail.us - 2013-09-10 11:36 -0400
    Re: Chardet, file, ... and the Flexible String Representation random832@fastmail.us - 2013-09-09 14:34 -0400
    Re: Chardet, file, ... and the Flexible String Representation Ian Kelly <ian.g.kelly@gmail.com> - 2013-09-09 13:03 -0600
    Re: Chardet, file, ... and the Flexible String Representation random832@fastmail.us - 2013-09-09 15:27 -0400
    Re: Chardet, file, ... and the Flexible String Representation Serhiy Storchaka <storchaka@gmail.com> - 2013-09-12 00:11 +0300

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