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The C windows API call was wrong. The lpBytesReturned parameter was set to NULL. While the docmentation at: https://msdn.microsoft.com/en-us/library/windows/desktop/aa363406(v=vs.85).aspx states that it CANNOT be NULL if lpOverlapped is NULL. Overlapped is for async operations. So the easiest way to fix this is to supply a proper pointer. I've also removed unused includes. And supplied the DeviceIoControl with proper ctypes calling information to prevent other python->c problems.