[issue8959] WINFUNCTYPE wrapped ctypes callbacks not functioning correctly in Python 2.7

[Michael Curran]

Michael Curran <mick at nvaccess.org> added the comment:

The issue does not occure with Python 2.7 beta 1, but does occure in Python 2.7 beta 2.

So, with this in mind, its probably more likely that it may have been caused by the following change:
"- On Windows, ctypes does no longer check the stack before and after calling a
  foreign function.  This allows to use the unmodified libffi library."

I had previously thought it could have been the libffi upgrade, but this seems to have  happened in Beta 1.

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<http://bugs.python.org/issue8959>
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