#include "stdio.h"

#define _DLL_EXPORT extern "C" __declspec( dllexport )

typedef void (__stdcall *call_back_type)();
//typedef void (__cdecl *call_back_type)();
struct TD
{
 int type;
 call_back_type t;
//here may be other functions
};

_DLL_EXPORT  void* test(void *o,int i,TD t)
{
 printf("%x %d %d\n",(unsigned long)o,i,t.type);
 t.t();
 return o;
}