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'CS/COM'에 해당되는 글 2건[COM/C++] offsetofclass 매크로CS/COM 2009. 8. 9. 22:41ATL 소스 분석중 나온 매크로로 COM_INTERFACE_ENTRY에 사용된다. #define offsetofclass(base, derived) \ ((DWORD_PTR)(static_cast<base*>((derived*)_ATL_PACKING)) - _ATL_PACKING))베이스 클래스의 오프셋을 구하는 매크로다... 별거 아닌데.. DWORD_PTR을 unsigned long* 로 해석해서 완전 해맸다... 히밤  [COM] [예제] COM Aggregation 에서의 castingCS/COM 2009. 4. 24. 07:00COM공부중 Aggregation 공부하던중 왠지 casting 부분에서 급 혼란. -_-;
Casting을 하게 되면, Casting된 Object를 Base class부터 생각하고, 이후 그 Object의 Derived class를 생각하자!!! -_-;;;
class IUnknown
{
public:
virtual void QueryInterface() = 0;
virtual void AddRef() = 0;
virtual void Release() = 0;
};
class IDummy : public IUnknown
{
public:
virtual void Fx() = 0;
};
class INondelegatingUnknown
{
public:
virtual void NondelegatingQueryInterface() = 0;
virtual void NondelegatingAddRef() = 0;
virtual void NondelegatingRelease() = 0;
};
class C : public IDummy,
public INondelegatingUnknown
{
public:
virtual void QueryInterface() { std::cout << "QueryInterface" << std::endl; }
virtual void AddRef() { std::cout << "AddRef" << std::endl; }
virtual void Release() { std::cout << "Release" << std::endl; }
virtual void NondelegatingQueryInterface()
{ std::cout << "NondelegatingQueryInterface" << std::endl; }
virtual void NondelegatingAddRef()
{ std::cout << "NondelegatingAddRef" << std::endl; }
virtual void NondelegatingRelease()
{ std::cout << "NondelegatingRelease" << std::endl; }
virtual void Fx() { std::cout << "Fx()" << std::endl; }
C();
public:
IUnknown* m_pI;
void Go();
};
C::C()
{
m_pI = reinterpret_cast<IUnknown*>
( static_cast<INondelegatingUnknown*>(this) );
}
void C::Go()
{
m_pI->QueryInterface();
}
int _tmain(void)
{
C c;
c.Go();
return 0;
}
Inside COM Aggregation 예제
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InsideComAggregation.zip