[newbie] problem with module PyVisa

Newsgroups	comp.lang.python
Date	2012-11-09 08:19 -0800
Message-ID	<2f065a8d-5cf6-455f-b559-d1b78d225fca@10g2000vbu.googlegroups.com> (permalink)
Subject	[newbie] problem with module PyVisa
From	Jean Dubois <jeandubois314@gmail.com>

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I'm trying to control a programmable power supply via USB using
python.
After doing some googling I thought I should use PyVisa for this
purpose, so I installed it as follows:
tar xvfz PyVISA-1.4.tar.gz
cd PyVISA-1.4
python setup.py install

Installation seems to finish without errors.

When I start a python session things go wrong as you can see in the
output below,
can anyone here tell me how to proceed correctly? thanks in advance.

>>> import visa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.6/dist-packages/PyVISA-1.4-py2.6.egg/
visa.py", line 1, in <module>
    from pyvisa.visa import *
  File "/usr/local/lib/python2.6/dist-packages/PyVISA-1.4-py2.6.egg/
pyvisa/visa.py", line 231, in <module>
    resource_manager = ResourceManager()
  File "/usr/local/lib/python2.6/dist-packages/PyVISA-1.4-py2.6.egg/
pyvisa/vpp43.py", line 105, in __new__
    it.init(*args, **kwds)
  File "/usr/local/lib/python2.6/dist-packages/PyVISA-1.4-py2.6.egg/
pyvisa/visa.py", line 227, in init
    self.session = self.vi = vpp43.open_default_resource_manager()
  File "/usr/local/lib/python2.6/dist-packages/PyVISA-1.4-py2.6.egg/
pyvisa/vpp43.py", line 758, in open_default_resource_manager
    visa_library().viOpenDefaultRM(byref(session))
  File "/usr/local/lib/python2.6/dist-packages/PyVISA-1.4-py2.6.egg/
pyvisa/vpp43.py", line 175, in __call__
    self.load_library()
  File "/usr/local/lib/python2.6/dist-packages/PyVISA-1.4-py2.6.egg/
pyvisa/vpp43.py", line 146, in load_library
    self.__lib = self.__cdecl_lib = cdll.LoadLibrary(path)
  File "/usr/lib/python2.6/ctypes/__init__.py", line 431, in
LoadLibrary
    return self._dlltype(name)
  File "/usr/lib/python2.6/ctypes/__init__.py", line 353, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /usr/local/vxipnp/linux/bin/libvisa.so.7: cannot open shared
object file: No such file or directory

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[newbie] problem with module PyVisa Jean Dubois <jeandubois314@gmail.com> - 2012-11-09 08:19 -0800
  Re: [newbie] problem with module PyVisa Rodrick Brown <rodrick.brown@gmail.com> - 2012-11-09 11:39 -0500
    Re: problem with module PyVisa Jean Dubois <jeandubois314@gmail.com> - 2012-11-09 12:43 -0800
      RE: problem with module PyVisa "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-11-09 21:16 +0000
      Re: problem with module PyVisa wrw@mac.com - 2012-11-09 16:14 -0500
        Re: problem with module PyVisa Jean Dubois <jeandubois314@gmail.com> - 2012-11-11 11:30 -0800
          Re: problem with module PyVisa Jean Dubois <jeandubois314@gmail.com> - 2012-11-20 05:28 -0800

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