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_declspec(selectany) GUID CLSID_Mine = { 0xdc186800,      0x657f,      0x11d4,       {0xb0, 0xb5,  0x0,  0x50,  0xba,  0xbf,  0xc9,  0x4}    };

interface __declspec(uuid("F614FB00-6702-11d4-B0B7-0050BABFC904")) ImyInterface : public IUnknown  {   STDMETHOD(Square)(long *pVal)PURE;   STDMETHOD(Cube)(long *pVal)PURE;  };    ¿Í»§¶ËʹÓô˽ӿڣº  HRESULT hr;  ImyInterface *pmine=(0);  hr = CoCreateInstance(CLSID_Mine,               // COM ·þÎñÆ÷µÄCLSID                         NULL,   //²»Ö§³Ö¾ÛºÏ                        CLSCTX_INPROC_SERVER,     // ÊǸöDLL                         __uuidof(ImyInterface),   // ½Ó¿ÚµÄIID                        (void**)&pmine                          );

class CmyInterface : public CComBase<> ,                    public InterfaceImpl   {  public:   CmyInterface();   virtual ~CmyInterface();     // ÎÒÃDZØÐëҪΪQueryInterface ±àд´úÂë   STDMETHOD(QueryInterface)(REFIID riid,LPVOID *ppv);     // ImyInterface ½Ó¿Ú·½·¨   STDMETHOD(Square)(long *pVal);   STDMETHOD(Cube)(long *pVal);    };

STDMETHODIMP CmyInterface::QueryInterface(REFIID riid,LPVOID *ppv)  {   *ppv = NULL;   if(IsEqualIID(riid,IID_IUnknown) || IsEqualIID(riid,__uuidof(ImyInterface)))   {    // ÒòΪÎÒÃÇ´ÓImyInterface¼Ì³Ð£¬ËùÒÔÒª½øÐÐÇ¿ÖÆÀàÐÍת»»    *ppv = (ImyInterface *) this;          _AddRef();    // Õâ¸ö·½·¨´Óij¸ö»ùÀà¼Ì³Ð¶øÀ´    return S_OK;   }   return E_NOINTERFACE;  }    STDMETHODIMP CmyInterface::Square(long *pVal)  {   long value = *pVal;   *pVal = value * value;   return S_OK;  }    STDMETHODIMP CmyInterface::Cube(long *pVal)  {   long value = *pVal;   *pVal = value * value * value;   return S_OK;  }

STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppvOut)  {      *ppvOut = NULL;      if (IsEqualIID(rclsid, CLSID_Mine))      {         // ΪCmyInterfaceÀàÉùÃ÷À๤³§         CClassFactory          *pcf = new CClassFactory;          return pcf->QueryInterface(riid,ppvOut);      }      return CLASS_E_CLASSNOTAVAILABLE;  }

template  class CSingleCreator  {  protected:   CSingleCreator():m_pObj(0) {};     comObj *CreateObject()   {    if(!m_pObj)    {     m_pObj = new comObj;    }    return m_pObj;   }   comObj * m_pObj;  };    // CMultiCreator ÓÃÓÚ³£ÓÃÀ๤³§£¬Õâ¸öÀàΪÿһ¸öCreateObjectÇëÇó·µ»ØеĶÔÏóÖ¸Õë..  template  class CMultiCreator  {  protected:   CMultiCreator():m_pObj(0) {};   comObj *CreateObject()   {    return new comObj;   }   comObj * m_pObj;  };      //ClassFactoryÀàʵÏÖ  // MultiCreatorÊÇȱʡµÄÀ๤³§´´½¨Õß  //Õâ¸öÀàʵÏÖÁ˽ӿÚIclasFactory......    class CClassFactory  : public CComBase<>,                         public InterfaceImpl,                         public creatorClass   {  public:   CClassFactory() {};   virtual ~CClassFactory() {};     STDMETHOD(QueryInterface)(REFIID riid,LPVOID *ppv)   {    *ppv = NULL;    if(IsEqualIID(riid,IID_IUnknown) || IsEqualIID(riid,IID_IClassFactory))    {     *ppv = (IClassFactory *) this;     _AddRef();        return S_OK;    }    return E_NOINTERFACE;   }     STDMETHODIMP CreateInstance(LPUNKNOWN pUnkOuter, REFIID riid, LPVOID *ppvObj)   {    *ppvObj = NULL;    if (pUnkOuter)        return CLASS_E_NOAGGREGATION;    m_pObj = CreateObject();  // m_pObj ÔÚcreatorClassÖж¨Òå    if (!m_pObj)        return E_OUTOFMEMORY;    HRESULT hr = m_pObj->QueryInterface(riid, ppvObj);    if(hr != S_OK)    {     delete m_pObj;    }    return hr;   }     STDMETHODIMP LockServer(BOOL) { return S_OK; }  // δʵÏÖ  };