ATL 实现IObjectSafety 接口

1. ATL 实现

如果com组件要在IE中进行调用，则必须实现IObjectSafety接口，不然在ie中必须调整activex选项才可以正常运行，

如下是实现IObjectSafety的例子：

#include <atlctl.h>

/////////////////////////////////////////////////////////////////////////////
// Cwebpy
class ATL_NO_VTABLE Cwebpy : 
	public CComObjectRootEx<CComSingleThreadModel>,
	public CComCoClass<Cwebpy, &CLSID_webpy>,
	public IDispatchImpl<Iwebpy, &IID_Iwebpy, &LIBID_ATLSAFTLib>,
	public IObjectSafetyImpl<Cwebpy,INTERFACESAFE_FOR_UNTRUSTED_CALLER|INTERFACESAFE_FOR_UNTRUSTED_DATA> 
{
public:
	Cwebpy()
	{
	}

DECLARE_REGISTRY_RESOURCEID(IDR_WEBPY)

DECLARE_PROTECT_FINAL_CONSTRUCT()

STDMETHODIMP GetInterfaceSafetyOptions( REFIID riid, DWORD *pdwSupportedOptions, DWORD *pdwEnabledOptions){
  ATLTRACE(_T("Cwebpy::GetInterfaceSafetyOptions()\n"));
  *pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
  *pdwEnabledOptions = *pdwSupportedOptions;
  return S_OK;
 }
 STDMETHODIMP GetInterfaceSafetyOptions( REFIID riid, DWORD *dwOptionSetMask, DWORD dwEnabledOptions){
  ATLTRACE(_T("Cwebpy::GetInterfaceSafetyOptions()\n"));
  return S_OK;
 }

BEGIN_COM_MAP(Cwebpy)
	COM_INTERFACE_ENTRY(Iwebpy)
	COM_INTERFACE_ENTRY(IDispatch)
	COM_INTERFACE_ENTRY(IObjectSafety)
END_COM_MAP()

// Iwebpy
public:
};

注意包含的文件头atlctl.h

 

2. mfc active 和SDI Automaion 实现

   头文件加入：

	BEGIN_INTERFACE_PART(ObjSafe, IObjectSafety) 
	STDMETHOD_(HRESULT, GetInterfaceSafetyOptions) ( 
	/* [in] */ REFIID riid, 
	/* [out] */ DWORD __RPC_FAR *pdwSupportedOptions, 
	/* [out] */ DWORD __RPC_FAR *pdwEnabledOptions 
	); 
	
	STDMETHOD_(HRESULT, SetInterfaceSafetyOptions) ( 
		/* [in] */ REFIID riid, 
		/* [in] */ DWORD dwOptionSetMask, 
		/* [in] */ DWORD dwEnabledOptions 
		); 
	END_INTERFACE_PART(ObjSafe); 

注意头文件要包含objsafe.h

实现文件添加：

BEGIN_INTERFACE_MAP(CApm2webDoc, CDocument)
	INTERFACE_PART(CApm2webDoc, IID_IApm2web, Dispatch)
	INTERFACE_PART(CApm2webDoc, IID_IObjectSafety, ObjSafe)   //这儿只添加这一句
END_INTERFACE_MAP()

///////////////////////////////////////////////////////////////////////////// 下面都要添加上
// IObjectSafety member functions
// Delegate AddRef, Release, QueryInterface
ULONG FAR EXPORT CApm2webDoc::XObjSafe::AddRef()
{
    METHOD_PROLOGUE(CApm2webDoc, ObjSafe)
    return pThis->ExternalAddRef();
}
ULONG FAR EXPORT CApm2webDoc::XObjSafe::Release()
{
    METHOD_PROLOGUE(CApm2webDoc, ObjSafe)
    return pThis->ExternalRelease();
}
HRESULT FAR EXPORT CApm2webDoc::XObjSafe::QueryInterface(
    REFIID iid, void FAR* FAR* ppvObj)
{
    METHOD_PROLOGUE(CApm2webDoc, ObjSafe)
    return (HRESULT)pThis->ExternalQueryInterface(&iid, ppvObj);
}
const DWORD dwSupportedBits = 
  INTERFACESAFE_FOR_UNTRUSTED_CALLER |
  INTERFACESAFE_FOR_UNTRUSTED_DATA;
const DWORD dwNotSupportedBits = ~ dwSupportedBits;
  
/////////////////////////////////////////////////////////////////////////////
// CStopLiteCtrl::XObjSafe::GetInterfaceSafetyOptions
// Allows container to query what interfaces are safe for what. We're
// optimizing significantly by ignoring which interface the caller is
// asking for.
HRESULT STDMETHODCALLTYPE 
CApm2webDoc::XObjSafe::GetInterfaceSafetyOptions( 
												 /* [in] */ REFIID riid,
												 /* [out] */ DWORD __RPC_FAR *pdwSupportedOptions,
												 /* [out] */ DWORD __RPC_FAR *pdwEnabledOptions)
{
	METHOD_PROLOGUE(CApm2webDoc, ObjSafe)
		HRESULT retval = ResultFromScode(S_OK);
	// does interface exist?
	IUnknown FAR* punkInterface;
	retval = pThis->ExternalQueryInterface(&riid, 
		(void * *)&punkInterface);
	if (retval != E_NOINTERFACE) { // interface exists
		punkInterface->Release(); // release it--just checking!
	}
	
	// we support both kinds of safety and have always both set,
	// regardless of interface
	*pdwSupportedOptions = *pdwEnabledOptions = dwSupportedBits;
	return retval; // E_NOINTERFACE if QI failed
}
/////////////////////////////////////////////////////////////////////////////
// CStopLiteCtrl::XObjSafe::SetInterfaceSafetyOptions
// Since we're always safe, this is a no-brainer--but we do check to make
// sure the interface requested exists and that the options we're asked to
// set exist and are set on (we don't support unsafe mode).
HRESULT STDMETHODCALLTYPE 
CApm2webDoc::XObjSafe::SetInterfaceSafetyOptions( 
												 /* [in] */ REFIID riid,
												 /* [in] */ DWORD dwOptionSetMask,
												 /* [in] */ DWORD dwEnabledOptions)
{
    METHOD_PROLOGUE(CApm2webDoc, ObjSafe)
		
		// does interface exist?
		IUnknown FAR* punkInterface;
	pThis->ExternalQueryInterface(&riid, (void * *)&punkInterface);
	if (punkInterface) { // interface exists
		punkInterface->Release(); // release it--just checking!
	}
	else { // interface doesn't exist
		return ResultFromScode(E_NOINTERFACE);
	}
	// can't set bits we don't support
	if (dwOptionSetMask & dwNotSupportedBits) { 
		return ResultFromScode(E_FAIL);
	}
	
	// can't set bits we do support to zero
	dwEnabledOptions &= dwSupportedBits;
	// (we already know there are no extra bits in mask )
	if ((dwOptionSetMask & dwEnabledOptions) !=
		dwOptionSetMask) {
		return ResultFromScode(E_FAIL);
	}        
	
	// don't need to change anything since we're always safe
	return ResultFromScode(S_OK);
}

SDI 中添加到doc类中，activex添加到主类实现文件中！