yinkaisheng added the comment:

After debugging, I found the reason.
when ctypes loads the dll, CoCreateInstance blocks the flow.

If I don't call CoCreateInstance in function DllMain. ctypes can load the dll.

I should call function CoCreateInstance after DllMain was called. 

The problem was fixed.

----------
resolution:  -> wont fix
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19790>
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