eclipse-cyclonedds / eclipse-cyclonedds/cyclonedds-python

Failed to load CycloneDDS library from C:\bin\ddsc.dll

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Python
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Description

Hello, I'm getting this error when trying to import cyclonedds-nightly. I have tried different versions of cyclonedds-nightly, but I'm getting the same error message. This here using cyclonedds-nightly 2024.10.12 and python 3.11.9 with Windows 11 appear "Failed to load CycloneDDS library from C:\bin\ddsc.dll" but this lib is there.

Traceback (most recent call last):
  File "C:\Users\avelino.bruno\PycharmProjects\proj-cyclonedds\.venv\Lib\site-packages\cyclonedds\internal.py", line 34, in _load
    library = ct.CDLL(path)
              ^^^^^^^^^^^^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.2544.0_x64__qbz5n2kfra8p0\Lib\ctypes\__init__.py", line 376, in __init__
    self._handle = _dlopen(self._name, mode)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: Could not find module 'C:\bin\ddsc.dll' (or one of its dependencies). Try using the full path with constructor syntax.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\avelino.bruno\PycharmProjects\proj-cyclonedds\main.py", line 1, in <module>
    from cyclonedds import *
  File "C:\Users\avelino.bruno\PycharmProjects\proj-cyclonedds\.venv\Lib\site-packages\cyclonedds\__init__.py", line 13, in <module>
    from . import internal, util, qos, core, domain, topic, pub, sub, builtin, dynamic, idl
  File "C:\Users\avelino.bruno\PycharmProjects\proj-cyclonedds\.venv\Lib\site-packages\cyclonedds\internal.py", line 233, in <module>
    class DDS:
  File "C:\Users\avelino.bruno\PycharmProjects\proj-cyclonedds\.venv\Lib\site-packages\cyclonedds\internal.py", line 237, in DDS
    _dll_handle = load_cyclonedds()
                  ^^^^^^^^^^^^^^^^^
  File "C:\Users\avelino.bruno\PycharmProjects\proj-cyclonedds\.venv\Lib\site-packages\cyclonedds\internal.py", line 132, in load_cyclonedds
    lib = loader()
          ^^^^^^^^
  File "C:\Users\avelino.bruno\PycharmProjects\proj-cyclonedds\.venv\Lib\site-packages\cyclonedds\internal.py", line 58, in _loader_cyclonedds_home
    return _load(os.path.join(os.environ["CYCLONEDDS_HOME"], name))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\avelino.bruno\PycharmProjects\proj-cyclonedds\.venv\Lib\site-packages\cyclonedds\internal.py", line 36, in _load
    raise CycloneDDSLoaderException(f"Failed to load CycloneDDS library from {path}")
cyclonedds.internal.CycloneDDSLoaderException: Failed to load CycloneDDS library from C:\bin\ddsc.dll

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with cyclonedds/internal.py, especially _load, load_cyclonedds, and _loader_cyclonedds_home, then reproduce the import failure on the reported Python and Windows versions. Trace why C:\bin\ddsc.dll cannot be loaded despite existing, and consider the issue complete when the cause is identified and the import path has a verified fix or a clear diagnostic test.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
distributed-systems
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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