FileNotFoundError: Could not find module 'libopenvr_api_64' on Windows with Anaconda

Hi, I’m trying to setup a conda environment to code in Spyder. However, when I try to import openvr, I get a FileNotFoundError on the dll. I found that adding CONDA_DLL_SEARCH_MODIFICATION_ENABLE=1 is not enough (related issue). I get a WinError deeper in the callstack.

To recreate

conda create -n openvr-env python -y conda activate openvr-env pip install openvr python import openvr

Traceback

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\<User>\miniconda3\envs\openvr-env\lib\site-packages\openvr\__init__.py", line 64, in <module>
    _openvr = cdll.LoadLibrary(_openvr_lib_name)
  File "C:\Users\<User>\miniconda3\envs\openvr-env\lib\ctypes\__init__.py", line 460, in LoadLibrary
    return self._dlltype(name)
  File "C:\Users\<User>\miniconda3\envs\openvr-env\lib\ctypes\__init__.py", line 382, in __init__
    self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'libopenvr_api_64' (or one of its dependencies). Try using the full path with constructor syntax.

OS: Windows 64bit

Possible fix

Always import the full path has it is done for Linux (line 62 in openvr_init_.py). This works fine in conda and in standard python install.

[Florian-Cormee]

You are totally right. pkg_resources is a serious improvement.

I agree with you, python 3.7 as a requirement seems reasonnable.

I miss use the term “cross platform”. I meant it would add a dependency. Cross install would make more sense. It doesn’t really matter anyway.

I tested both pkg_resources and you’re latest switch to importlib both work like a charm on windows in my conda environment.

[cmbruns]

@Florian-Cormee that’s great news! Thanks for testing and reporting. By the way, I will probably go back to pkg_resources, because I found a problem with importlib on python 3.8, and python 3.8 will likely be the system python on Ubuntu LTS at least until April 2022. Eventually when python 3.8 is no longer important, it will be time to move to importlib.