PyO3 Python extension missing dlls

[Design0r]

Hi, im trying to make a simple python extension using maturin and the PyO3 bindings.

The Program loads an .exr file and saves it as a .jpg and its working fine as a standalone tool.
So i used maturin to create a python extension and when I try to import this extension in a python script i get following error:

“ImportError: Dll Load Failed: The specified module could not be found”.

I inspected the generated .pyd file with Dependency Walker and found it had issues finding a "OPENEXR-C-0_10-SHARED.DLL".
I have honestly no Idea where to get this file from as i cant find it in the prebuilt openexr release in the target folder of my rust project.

Any tips would be greatly appreciated

[scott-wilson]

The OpenEXR bindings are still in a huge state of flux. Chances are they'll be rewritten so they use CXX. But, if all you're after are Python bindings and image IO, have you looked into OpenImageIO?

[Design0r]

thanks for the quick answer. My current solution uses the OpenImageIO Python bindings. I mainly wanted to learn a bit of rust and so i thought i could try out the rust bindings for openEXR and make an extension for a python tool im working on

[scott-wilson]

No worries! We're making some progress with the OpenImageIO Rust bindings. If you're interested, we could use some support. https://github.com/vfx-rs/oiio-bind

[Design0r]

I would love to contribute, but I'm afraid I wouldn't be much help since I'm not a C++ person and only recently started picking up Rust.

[scott-wilson]

Sounds like a great time to learn. ;)

If you're interested, I think it might be a good idea to set up a Zoom call and go over creating a binding. I recommend going to the #rust channel in the ASWF Slack (join here: https://slack.aswf.io/), and I will set up a demo for maybe next week or so.