On 01/04/2011 18:00, Donald Bedsole wrote:
Hi Mark,
On Fri, Apr 1, 2011 at 11:42 AM,<markri...@gsoftcon.com> wrote:
I would like to control electronic instruments with PyVISA. I have downloaded
PyVISA and unpacked the files into the Python27/lib/site-packages dir and in
the IDLE
GUI I run "import visa' for a quick check and I get this error:
import visa
Traceback (most recent call last):
File "<pyshell#25>", line 1, in<module>
import visa
ImportError: No module named visa
I'm scratching my head. Help
Mark R Rivet, Genesis Software Consulting
ASCT(Computer Technologies), BSIT/SE(Software Engineering)
Electrical Engineering Technician
Member IEEE, Computer Society
Do or do not; there is no try.
Could this be the problem?
No. The problem above is at a higher level. This is what you get at a
lower level trying to import the code. At least I think so :)
c:\Users\Mark\Cashflow\Python>python -V
Python 2.7.1
c:\Users\Mark\Cashflow\Python>python -c "import visa"
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "c:\python27\lib\site-packages\visa.py", line 1, in <module>
from pyvisa.visa import *
File "c:\python27\lib\site-packages\pyvisa\visa.py", line 231, in
<module>
resource_manager = ResourceManager()
File "c:\python27\lib\site-packages\pyvisa\vpp43.py", line 105, in
__new__
it.init(*args, **kwds)
File "c:\python27\lib\site-packages\pyvisa\visa.py", line 227, in init
self.session = self.vi = vpp43.open_default_resource_manager()
File "c:\python27\lib\site-packages\pyvisa\vpp43.py", line 758, in
open_default_resource_manager
visa_library().viOpenDefaultRM(byref(session))
File "c:\python27\lib\site-packages\pyvisa\vpp43.py", line 175, in
__call__
self.load_library()
File "c:\python27\lib\site-packages\pyvisa\vpp43.py", line 141, in
load_library
self.__lib = windll.visa32
File "c:\python27\lib\ctypes\__init__.py", line 423, in __getattr__
dll = self._dlltype(name)
File "c:\python27\lib\ctypes\__init__.py", line 353, in __init__
self._handle = _dlopen(self._name, mode)
WindowsError: [Error 126] The specified module could not be found
PyVISA doesn’t implement VISA itself. Instead, PyVISA provides
bindings to the VISA library (a DLL or
“shared object” file). This library is usually shipped with your GPIB
interface or software like LabVIEW. Alternatively, you can download it
from your favourite equipment vendor (National Instruments, Agilent,
etc).
quote from this document:
http://pyvisa.sourceforge.net/pyvisa.pdf
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Cheers.
Mark L.
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