pyvisa: visa.ResourceManager() got function 'viOpen' not found in Windows
Now we use pyvisa to load the visa library in Windows.
But when we call visa.ResourceManager() or visa.ResourceManager(r'C:\Windows\System32\visa32.dll'), it throws exception of “AttributeError: function ‘viOpen’ not found”.
About this issue
- Original URL
- State: closed
- Created 6 years ago
- Comments: 25 (13 by maintainers)
I get this too, on 32 bits Windows 8.1 installation, with 32 bits
python 3.8.6,PyVISA==1.11.3andKeysight IO Libraries suite. Doingos.add_dll_directory(r"C:\Program Files\Keysight\IO Libraries Suite\bin")fixes the issue for me.Maybe it might still work for some OS/python version combination or when we are upgrading python instead of a fresh install. https://docs.python.org/3/library/os.html#os.add_dll_directory https://docs.python.org/3/whatsnew/3.8.html#bpo-36085-whatsnew
I guess there is no other workaround for this outside of using
os.add_dll_directory(r"C:\Program Files\Keysight\IO Libraries Suite\bin").That looks like an issue related to the new dll mechanism access on Python 3.8. However I have a windows system running 3.8 and Keysight with no issue. It may still be an installation issue though. If you do not want to re-install you can try to use
os.add_dll_directoryto add the Keyisght directory found under Program files.