[issue20160] broken ctypes calling convention on MSVC / 64-bit Windows (large structs)

[John Ehresman]

John Ehresman added the comment:

I've confirmed that the test included in the 3/25/15 patch fails without the change to ffi.c.  I think the 11/5/14 change fixed the bug for calling into a C function and converting the return value, but did not address the callback case.  The new patch seems to fix the callback case.

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nosy: +jpe

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