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//
// Component.cpp
#include <iostream.h>
#include <objbase.h>
#include "Interface.h"
void TRACE(const char* msg) { cout << "Component:\t" << msg << endl ;}
//
// Component
//
class CComponent : public IComponent
{
// IUnknown implementation
virtual HRESULT __stdcall QueryInterface(const IID& iid, void** ppv) ;
virtual ULONG __stdcall AddRef() ;
virtual ULONG __stdcall Release() ;
// Interface IComponent implementation
virtual void __stdcall Print(const char* msg);
public:
CComponent() ;
~CComponent();
private:
long m_cRef ;
} ;
/////////////////////
CComponent::CComponent()
{
m_cRef=0;
}
//////////////////////
CComponent::~CComponent()
{
TRACE("Destructing the component...") ;
}
///////////////////////////////////////////////////////////////////////////
HRESULT __stdcall CComponent::QueryInterface(const IID& iid, void** ppv)
{
if (iid == IID_IUnknown)
{
TRACE("Returning pointer to IUnknown...") ;
*ppv = static_cast<IComponent*>(this) ;
}
else if (iid == IID_IComponent)
{
TRACE("Returning pointer to IComponent interface...") ;
*ppv = static_cast<IComponent*>(this) ;
}
else
{
TRACE("Interface is not supported!.") ;
*ppv = NULL ;
return E_NOINTERFACE ;
}
//The reinterpret_cast operator allows any pointer to be converted into
//any other pointer type.
reinterpret_cast<IUnknown*>(*ppv)->AddRef() ;
return S_OK ;
}
//////////////////////////////////////
ULONG __stdcall CComponent::AddRef()
{
return InterlockedIncrement(&m_cRef) ;
}
//////////////////////////////////////
ULONG __stdcall CComponent::Release()
{
if (InterlockedDecrement(&m_cRef) == 0)
{
delete this ;
return 0 ;
}
return m_cRef ;
}
//-------------
//Print method
//------------
//////////////////////////////////////////////////
void __stdcall CComponent:: Print(const char* msg)
{
cout<<"-----------------------"<<endl;
cout<<msg<<endl;
cout<<"-----------------------"<<endl;
}
//
// Creation function
//
extern "C" IUnknown* CreateInstance()
{
IUnknown* pIUnknown = static_cast<IComponent*>(new CComponent) ;
pIUnknown->AddRef() ;
return pIUnknown ;
}
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