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pupil-labs
Python pupil_Apriltags : Problem with DLL path “Could not find module”
Hello I have a problem with pupil_apriltags in python. I have been searching for more than 1 week and tried multiple solutions but none of them worked.
My problem is not with the import of the librairy but when I try to create the detector. There is a reference to a xxxx.dll file (I think) which does not work.
My code
Very simple
from pupil_apriltags import Detector
import cv2
import numpy as np
at_detector = Detector(families='tag36h11',
nthreads=1,
quad_decimate=1.0,
quad_sigma=0.0,
refine_edges=1,
decode_sharpening=0.25,
debug=0)
My error
Traceback (most recent call last):
File "detection_apriltags.py", line 6, in <module>
at_detector = Detector()
File "C:\Users\Utilisateur\anaconda3\lib\site-packages\pupil_apriltags\bindings.py", line 285, in __init__
self.libc = ctypes.CDLL(str(hit))
File "C:\Users\Utilisateur\anaconda3\lib\ctypes\__init__.py", line 381, in __init__
self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'C:\Users\Utilisateur\anaconda3\lib\site-
packages\pupil_apriltags\lib\apriltag.dll' (or one of its dependencies). Try using the full path
with constructor syntax.
My configuration
- Python 3.8.5
- Windows 10
It seems that we need to change the path here.
But I don't know how to change...
Same question is here:
https://stackoverflow.com/questions/67919822/python-pupil-apriltags-problem-with-dll-path-could-not-find-module
Answer:
I had the same problem, apparently the .dll search mechanism changed in python 3.8 You can see more details of how to fix it here.
I made a PR into this repo to fix the issue. See https://github.com/pupil-labs/apriltags/pull/48
After this PR is accepted this issue can be closed, I believe.
Problem
Hi there, just recently experienced the same problem with FileNotFoundError: Could not find module 'path/to/existing/dll'. Problem was caused by dependent libraries in different folder.
In my case...
- installation with
pip install pupil-apriltagsin conda environment- pupil-apriltags==1.0.4.post10
- Python==3.9.16
- Windows 10 Enterprise - 10.0.19045
- when trying to create detector Error message showed that missing module is
C:/Users/username/Miniconda3/envs/my_env/lib/site-packages/pupil_apriltags/libapriltag.dllwith same errors as @marceau45800 mentioned - found out thanks to dll-diagnostics that this dll library is dependent on these libraries
(my_env) C:\>dlldiag trace C:/Users/username/Miniconda3/envs/my_env/lib/site-packages/pupil_apriltags/lib/apriltag.dll
DLL Diagnostic Tools version 0.0.18
Copyright (c) 2019-2021 Adam Rehn
Parsing module header and identifying non delay-loaded dependencies... done.
Identifying the module's delay-loaded dependencies... done.
Parsed module details:
Module: C:\Users\username\Miniconda3\envs\my_env\lib\site-packages\pupil_apriltags\lib\apriltag.dll
Type: Dynamic-Link Library
Architecture: x64
The module imports 12 direct dependencies:
api-ms-win-crt-convert-l1-1-0.dll
api-ms-win-crt-environment-l1-1-0.dll
api-ms-win-crt-heap-l1-1-0.dll
api-ms-win-crt-math-l1-1-0.dll
api-ms-win-crt-runtime-l1-1-0.dll
api-ms-win-crt-stdio-l1-1-0.dll
api-ms-win-crt-string-l1-1-0.dll
api-ms-win-crt-utility-l1-1-0.dll
KERNEL32.dll
pthreadVC2.dll
VCRUNTIME140.dll
WINMM.dll
Error: no debugger found for architecture x64. Please ensure the Debugging Tools for Windows 10 (WinDbg) are installed correctly.
- just looked around and found this folder with libraries
C:\Users\username\Miniconda3\envs\my_env\lib\site-packages\pupil_apriltags.libs
Solution
just add this line before creating Detector instance:
os.add_dll_directory("C:/Users/username/Miniconda3/envs/my_env/lib/site-packages/pupil_apriltags.libs")
It worked for me.
