[issue8275] callback function on win64 results in bad behavior. mem corruption?

[stan mihai]

stan mihai <stanmihai4 at gmail.com> added the comment:

Disabling optimizations doesn't really fix the issue, just hides it, for now.

The problem was an uninitialized variable. Attached is the patch that fixes it.

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nosy: +stan.mihai
Added file: http://bugs.python.org/file20527/ctypes_win64.diff

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