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nknown = NULL;
hrRetCode = spIUnknown.CoCreateInstance(CLSID_CALCULATOR);
KG_COM_ASSERT_EXIT(hrRetCode);
hrRetCode = spIUnknown.QueryInterface(&pCalculator);//ͨ¹ý´Ëº¯Êý²éѯ½Ó¿Ú
KG_COM_ASSERT_EXIT(hrRetCode);
hrRetCode = pCalculator->Add(1, 2, &nSum);
KG_COM_ASSERT_EXIT(hrRetCode);

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