[newbie] problem with module PyVisa

2012-11-09 Thread Jean Dubois 
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
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: [newbie] problem with module PyVisa

2012-11-09 Thread Rodrick Brown 
It seems pretty obvious from the error. Try installing the missing lib packages.

OSError: /usr/local/vxipnp/linux/bin/libvisa.so.7: cannot open shared
object file: No such file or directory


Sent from my iPhone

On Nov 9, 2012, at 11:22 AM, Jean Dubois jeandubois...@gmail.com wrote:

 OSError: /usr/local/vxipnp/linux/bin/libvisa.so.7: cannot open shared
 object file: No such file or directory
-- 
http://mail.python.org/mailman/listinfo/python-list