// {3ED0ACD0-785E-4462-A554-FCB610E6880F} 

DEFINE_GUID(IID_ICalculator, 
0x3ed0acd0, 0x785e, 0x4462, 0xa5, 0x54, 0xfc, 0xb6, 0x10, 0xe6, 0x88, 0xf);

 // {52DD602C-0A9D-4328-B72D-3889402504DA} 
DEFINE_GUID(CLSID_CoClassCalculator, 
0x52dd602c, 0xa9d, 0x4328, 0xb7, 0x2d, 0x38, 0x89, 0x40, 0x25, 0x4, 0xda);

typedef HRESULT  (__fastcall *DLLGet) (
  REFCLSID rclsid,
  DWORD dwClsContext,
  COSERVERINFO * pServerInfo,
  REFIID riid,
  LPVOID * ppv
);

int main(int argc, char* argv[])
{
	HRESULT hrinit = CoInitialize (NULL);
	assert (hrinit == S_OK);

	ICalculator * pointee;
	HINSTANCE lib = CoLoadLibrary (L"H:\\docs_xp\\Visual Studio Projects\\com_calculator\\Debug\\com_calculator.dll" , TRUE);
	assert (lib);
	void * pfoo = GetProcAddress (lib , "DllGetClassObject");
	assert (pfoo);
	DLLGet get = (DLLGet)pfoo;

	HRESULT hr = get (CLSID_CoClassCalculator , 
		CLSCTX_INPROC_SERVER,  0 , IID_ICalculator, (void **) & pointee);

	 //HRESULT hr = CoGetClassObject (CLSID_CoClassCalculator ,  
	 //	CLSCTX_INPROC_SERVER, 0, IID_ICalculator, (void **) & pointee); 

	if (SUCCEEDED(hr)){
		printf ("OK");
	}
	else
		printf ("Failed");

	CoUninitialize ();
	return  0 ;
}

STDAPI DllGetClassObject (REFCLSID rclsid , REFIID riid, LPVOID * ppv){
	if (rclsid != CLSID_CoClassCalculator)
		return CLASS_E_CLASSNOTAVAILABLE;
	CoClassCalculator * cocalc = new CoClassCalculator ();
	HRESULT hr = cocalc->QueryInterface (riid, ppv);
	if (FAILED (hr) ){
		delete cocalc;
	}
	return hr;
}