[PythonCE] serial port access

[Benjamin McBride]

Thanks all for your help!

The final key was to use the wide-character variant of CreateFile.  As
soon as I have the code cleaned up I will post the code (should be in the
next day or so).  It will have a similar interface as pySerial.

Thanks,

Ben McBride

On 6/21/06, Luke Dunstan <coder_infidel at hotmail.com> wrote:
>
> You need to use the wide-character variants of Windows APIs, i.e.
> CreateFileW
>
> Luke
>
> ----- Original Message -----
> From: "Benjamin McBride" <benjamin.mcbride at gmail.com>
> To: <pythonce at python.org>
> Sent: Wednesday, June 21, 2006 4:54 AM
> Subject: Re: [PythonCE] serial port access
>
>
> Thanks Gonzalo for your help.  I have read both the ctypes and
> microsoft documentation.  My understanding is that I need to use the
> CreateFile API function from the coredll to get a handle to the comm
> port.  When I use ctypes:
>
> >>> windll.coredll.CreateFile
>
> I get an AttributeError saying the CreateFile function is not found.
> Ironically, the ReadFile, WriteFile, and CloseHandle functions are all
> found.
>
> Am I just missing something simple here?
>
> Ben
>
> On 6/20/06, Gonzalo Monzón <gmc at serveisw3.net> wrote:
> > Have you read the ctypes docs?
> >
> > http://starship.python.net/crew/theller/ctypes/tutorial.html
> >
> > You have to read the Microsoft docs too, search what dynamic libraries
> > to use and what functions to call. Study the example I posted, you have
> > to call these functions using ctypes:
> >
> > (openfile, readfile, writefile...)
> >
> > Don't know if somebody has implemented serial access using ctypes as to
> > post an example, read the docs, first you need to understand how ctypes
> > work -for that you should know or learn what C variable types are and
> > understand it almost a little bit, then the codeproject example will
> > come in handy- otherwise could be hard to code... Though any ctypes
> > example handling file or stream data may help you. Though pyserial uses
> > ctypes too, so you could have a look to the sources. The differences are
> > you have to use straight windows api calls, and pyserial calls a helper
> > library wich should use windows api's for windows platform.
> >
> > I have to code serial access too in the next weeks, but don't have the
> > time now to get my hands in it. If you are not in hurry I could post an
> > example when done.
> >
> > Gonzalo.
> >
> >
> > Benjamin McBride escribió:
> >
> > >I've got ctypes installed.  However, I have not been able to find any
> > >examples of how I might use ctypes for serial port access.  Any
> > >suggestions would be appreciated.
> > >
> > >Thanks,
> > >
> > >Ben
> > >
> > >On 6/20/06, Gonzalo Monzón <gmc at serveisw3.net> wrote:
> > >
> > >
> > >>Hi Benjamin,
> > >>
> > >>You can use ctypes for direct access to serial ports via windows apis
> > >>(openfile, readfile, writefile...)
> > >>
> > >>Note that manufacturers can have specific implementations, even they
> > >>must agree to PPC implementation, but you can found small differences.
> > >>
> > >>http://www.codeproject.com/system/simpleserialcomm.asp
> > >>
> > >>Regards,
> > >>Gonzalo
> > >>
> > >>
> > >>Benjamin McBride escribió:
> > >>
> > >>
> > >>
> > >>>    Hi All,
> > >>>
> > >>>    I need to access the serial port for my PPC application.  I have
> > >>> been
> > >>>    unable to locate information on this.  I'm using Python 2.4.3 and
> > >>> PPC
> > >>>    2003.  Previously I've used pyserial, but it appears that pyserial
> > >>> does
> > >>>    not work on Windows CE.
> > >>>
> > >>>    Thanks for any suggestions,
> > >>>
> > >>>    Ben McBride
> > >>>    bdm7935 at ksu.edu
> > >>>_______________________________________________
> > >>>PythonCE mailing list
> > >>>PythonCE at python.org
> > >>>http://mail.python.org/mailman/listinfo/pythonce
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>
> > >>
> > >_______________________________________________
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> > >PythonCE at python.org
> > >http://mail.python.org/mailman/listinfo/pythonce
> > >
> > >
> > >
> >
> >
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