Re: Sending USB commands with Python

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From	Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject	Re: Sending USB commands with Python
Date	Wed, 29 Aug 2012 18:56:03 -0400
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On Thu, 30 Aug 2012 08:29:32 +1000, Cameron Simpson <cs@zip.com.au>
declaimed the following in gmane.comp.python.general:

> On 29Aug2012 17:57, Dennis Lee Bieber <wlfraed@ix.netcom.com> wrote:
> | On Wed, 29 Aug 2012 14:21:30 -0700 (PDT), "Adam W."
> | <AWasilenko@gmail.com> declaimed the following in
> | gmane.comp.python.general:
> | > You are correct about the 2 being the number of bytes written.  However when I issue a read command I get:
> | > 
> | > >>> ep.write('\x1BA')
> | > 4
> | 
> | 	That's interesting -- as if each byte you send is expanding into a
> | pair of bytes.
> 
> UTF-16? ISTR that Windows often uses big endian UTF-16 for filenames and
> text data; could there be some default encoding in ep.write getting in
> your way?
> 
> Disclaimer: I'm really not a Windows guy.

	I know W9x has both "normal" and "wide" entry points in the system,
and I think WinXP and later default to the "wide" points, but I'd expect
any third party DLL would document what it expects to receive for a
device write operation.

	BUT you do give a possible clue. Is the OP using a 3.x Python where
strings are Unicode -- in which case the above may need to be explicitly
declared as a "byte string" rather than text (unicode) string.

	I've only recently upgraded my desktop to Python 2.7 (and had to
make sure that copying the old "CherryTemplate" from 2.5 was still
functional -- I don't have time to rework a program that builds a set of
static web pages from database information), so can't really check on
sizes.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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Thread

Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-29 18:56 -0400
  Re: Sending USB commands with Python "Adam W." <AWasilenko@gmail.com> - 2012-08-29 16:45 -0700
  Re: Sending USB commands with Python MRAB <python@mrabarnett.plus.com> - 2012-08-30 01:53 +0100
  Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-29 22:07 -0400
    Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-30 00:55 -0400
      Re: Sending USB commands with Python "Adam W." <AWasilenko@gmail.com> - 2012-08-30 05:51 -0700
        Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-30 14:24 -0400
        Re: Sending USB commands with Python Cameron Simpson <cs@zip.com.au> - 2012-08-31 08:47 +1000

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