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void __cdecl foo(unsigned __int32 a,
 unsigned __int32 b,
 unsigned __int32 c,
 unsigned __int32 d,
 unsigned __int32 e,
 unsigned __int32 f,
 unsigned __int32 g);
struct myStruct
{
 unsigned __int32 a;
 unsigned __int32 b;
 unsigned __int32 c;
 unsigned __int32 d;
 unsigned __int32 e;
 unsigned __int32 f;
 unsigned __int32 g;
}
void __cdecl bar(myStruct s);
void __cdecl errorPassingParameter(myStruct s1,
 myStruct s2,
 unsigned __int32 x); 
Calling foo and bar from python completed successfully, calling errorParsingParameter resulted in stack corruption. It seems that python passed an extra pointer in the stack for s2.