How to get voidptr out of capsule using python cffi?

Question

Is there any way to use cffi to extract the contents of a capsule and convert it into a voidptr which I can send into C code?

Background info -- numpy arrays can give you a capsule containing a very handy struct, namely the PyArrayInterface. I don't think capsules exist for PyPy yet, so the answer is probably no, but I believe that the future contains capsules for all python versions, so I'm hoping the answer is yes :).

Armin Rigo · Accepted Answer · 2015-10-27 15:52:26Z

1

I don't think so. Capsules are a way for some CPython C extension modules to pass around pointers; typically, between two different C extension modules. If you replace one of these modules with a CFFI version, you loose: there is no official way to get the "void *" value from Python, with or without CFFI. It looks like it would be a valid enhancement. Feel free to open a feature request here:

https://bitbucket.org/cffi/cffi/issues?status=new&status=open

answered Oct 27, 2015 at 15:52

Armin Rigo

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