COM 入门级设置

"MyGuids.h"

#pragma once

#include

DEFINE_GUID(IID_IX,
   0x32bb8320, 0xb41b, 0x11cf, 0xa6, 0xbb, 0x0, 0x80, 0xc7, 0xb2, 0xd6, 0x82);

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"Iface.h"

#pragma once

#include

// Interfaces
interface IX : IUnknown
{
       virtual void __stdcall Fx() = 0 ;
} ;

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"***.cpp"

#include "stdafx.h"
#include
#include "Iface.h"

#include
#include
#include "MyGuids.h"

using namespace std;

void trace(const char* msg) { cout << "Component 1:\t" << msg << endl ;}

//
// Component
//
class CA : public IX
{
 // IUnknown implementation
 virtual HRESULT __stdcall QueryInterface(const IID& iid, void** ppv) ;   
 virtual ULONG __stdcall AddRef() ;
 virtual ULONG __stdcall Release() ;  

 // Interface IX implementation
 virtual void __stdcall Fx() { cout << "Fx" << endl ;}

public:
 // Constructor
 CA() : m_cRef(0) {}

 // Destructor
 ~CA() { trace("Destroy self.") ;}

private:
 long m_cRef ;
} ;

HRESULT __stdcall CA::QueryInterface(const IID& iid, void** ppv)
{  
 if (iid == IID_IUnknown)
 {
  trace("Return pointer to IUnknown.") ;
  *ppv = static_cast(this) ;
 }
 else if (iid == IID_IX)
 {
  trace("Return pointer to IX.") ;
  *ppv = static_cast(this) ;
 }
 else
 {     
  trace("Interface not supported.") ;
  *ppv = NULL ;
  return E_NOINTERFACE ;
 }
 reinterpret_cast(*ppv)->AddRef() ;
 return S_OK ;
}

ULONG __stdcall CA::AddRef()
{
 return InterlockedIncrement(&m_cRef) ;
}

ULONG __stdcall CA::Release()
{
 if (InterlockedDecrement(&m_cRef) == 0)
 {
  delete this ;
  return 0 ;
 }
 return m_cRef ;
}

//
// Creation function
//
extern "C" IUnknown* CreateInstance()
{
 IUnknown* pI = static_cast(new CA) ;
 pI->AddRef() ;
 return pI ;
}

return pI ;
}

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"***.def"

LIBRARY         Cmpnt1.dll
DESCRIPTION     '(c)1996-1997 Dale E. Rogerson'

EXPORTS
                CreateInstance @1 PRIVATE