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letmaik / rawpy

📷 RAW image processing for Python, a wrapper for libraw
https://pypi.python.org/pypi/rawpy
MIT License
587 stars 67 forks source link

ImportError: DLL load failed while importing _rawpy #178

Closed yeahitsjan closed 2 years ago

yeahitsjan commented 2 years ago

First of all! Awesome library. I really like it and would test out some things on Windows. So I installed a fresh version of Windows 10, installed Python 3.10.5 and Visual Studio Code (the machine is empty). With pip install rawpy I installed rawpy and trying to import it gives me this result:

>>> import rawpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python310\lib\site-packages\rawpy\__init__.py", line 5, in <module>
    import rawpy._rawpy
ImportError: DLL load failed while importing _rawpy: The specified module was not found.

What can I do about it? Do I miss some dependencies?

Many thanks, Jan

letmaik commented 2 years ago

That shouldn't happen... I'll look into it, but in the meantime you can fix the issue by installing the latest Microsoft Visual C++ redistributable from https://docs.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist

yeahitsjan commented 2 years ago

Your solution worked fine. So the Redist pack is a requirement on a fresh Windows install.

letmaik commented 2 years ago

Thanks for reporting back. For reference, this is the same as described at https://github.com/pypa/cibuildwheel/blob/main/docs/faq.md#windows-importerror-dll-load-failed-the-specific-module-could-not-be-found. According to this page, the latest Python versions should come bundled with the required Visual C++ redistributable, so I'm not really sure why the issue happens anyway. I'm going to close the issue since a reasonable work-around exists and because the issue likely only appears on fresh/unpatched Windows installations.