On 11/28/2010 8:06 PM, Walter Prins wrote:
(snip stuff)
Ugh, you're probably not going to like this.  I've done some googling
and it appears this may be a 64-bit issue with the "ctypes" module...
apparently "64-bit ctypes can only import 64-bit libraries".  See here:

Then again, it also seems to be an open issue on the PySerial bug
tracker: http://ur.ly/vZNL

Note, the above ticket suggests that PySerial 2.4 works ok (impliedly
even on 64-bit XP, so I imagine also on Windows 7.)  You should be able
to try this out by downloading the 2.4 version instead and installing it
in the same way you did the 2.5 version.  In any case, it might be an
idea to post a report/add a comment to that bug report as well to maybe
help get this issue resolved.



Hi, Walter -

Thanks for all the research. This was my second attempt at installing the 2.4 version. I did it thus:

E:\Python27\pyserial-2.4>..\python setup.py install
standart distutils
running install
running build
running build_py
creating build
creating build\lib
creating build\lib\serial
copying serial\serialcli.py -> build\lib\serial
copying serial\serialjava.py -> build\lib\serial
copying serial\serialposix.py -> build\lib\serial
copying serial\serialutil.py -> build\lib\serial
copying serial\serialwin32.py -> build\lib\serial
copying serial\sermsdos.py -> build\lib\serial
copying serial\__init__.py -> build\lib\serial
running install_lib
running install_egg_info
Removing E:\Python27\Lib\site-packages\pyserial-2.4-py2.7.egg-info
Writing E:\Python27\Lib\site-packages\pyserial-2.4-py2.7.egg-info


But, when I tried it in Python, I got the same as before:

>>> import serial
>>> ser = serial.Serial(0, timeout = 1)
>>> ser
Serial<id=0x225c240, open=True>(port='COM1', baudrate=9600, bytesize=8, parity='N', stopbits=1, timeout=1, xonxoff=False, rtscts=False, dsrdtr=False)
>>> ser.read()

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
File "E:\Python27\lib\site-packages\serial\serialwin32.py", line 236, in read
    raise SerialException("ReadFile failed (%s)" % ctypes.WinError())
SerialException: ReadFile failed ([Error 6] The handle is invalid.)

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