_ClassFactoryCreatorClass

最新推荐文章于 2023-03-15 15:09:10 发布

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最新推荐文章于 2023-03-15 15:09:10 发布

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本文档介绍了如何使用DECLARE_CLASSFACTORY()和DECLARE_CLASSFACTORY_EX(cf)宏定义ATL类工厂创建者，用于COM组件的实例化。通过CComClassFactory和CComObjectCached，实现类工厂的声明和对象缓存，简化COM对象的创建过程。

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#define DECLARE_CLASSFACTORY() DECLARE_CLASSFACTORY_EX(ATL::CComClassFactory)

#define DECLARE_CLASSFACTORY_EX(cf) typedef ATL::CComCreator< ATL::CComObjectCached< cf > > _ClassFactoryCreatorClass;


class CComClassFactory :
	public IClassFactory,
	public CComObjectRootEx<CComGlobalsThreadModel>
{
public:
	BEGIN_COM_MAP(CComClassFactory)
		COM_INTERFACE_ENTRY(IClassFactory)
	END_COM_MAP()

	virtual ~CComClassFactory()
	{
	}
	
	// IClassFactory
	STDMETHOD(CreateInstance)(LPUNKNOWN pUnkOuter, REFIID riid, void** ppvObj)
	{
		ATLASSUME(m_pfnCreateInstance != NULL);
		HRESULT hRes = E_POINTER;
		if (ppvObj != NULL)
		{
			*ppvObj = NULL;
			// can't ask for anything other than IUnknown when aggregating

			if ((pUnkOuter != NULL) && !InlineIsEqualUnknown(riid))
			{
				ATLTRACE(atlTraceCOM, 0, _T("CComClassFactory: asked for non IUnknown interface while creating an aggregated object"));
				hRes = CLASS_E_NOAGGREGATION;
			}
			else
				hRes = m_pfnCreateInstance(pUnkOuter, riid, ppvObj);
		}
		return hRes;
	}

	STDMETHOD(LockServer)(BOOL fLock)
	{
		if (fLock)
			_pAtlModule->Lock();
		else
			_pAtlModule->Unlock();
		return S_OK;
	}
	// helper
	void SetVoid(void* pv)
	{
		m_pfnCreateInstance = (_ATL_CREATORFUNC*)pv;
	}
	_ATL_CREATORFUNC* m_pfnCreateInstance;
};

template <class license>
class CComClassFactory2 : 
	public IClassFactory2,
	public CComObjectRootEx<CComGlobalsThreadModel>,
	public license
{
public:
	typedef license _LicenseClass;
	typedef CComClassFactory2<license> _ComMapClass;
BEGIN_COM_MAP(CComClassFactory2<license>)
	COM_INTERFACE_ENTRY(IClassFactory)
	COM_INTERFACE_ENTRY(IClassFactory2)
END_COM_MAP()
	// IClassFactory
	STDMETHOD(LockServer)(BOOL fLock)
	{
		if (fLock)
			_pAtlModule->Lock();
		else
			_pAtlModule->Unlock();
		return S_OK;
	}
	STDMETHOD(CreateInstance)(LPUNKNOWN pUnkOuter,
		REFIID riid, void** ppvObj)
	{
		ATLASSUME(m_pfnCreateInstance != NULL);
		if (ppvObj == NULL)
			return E_POINTER;
		*ppvObj = NULL;
		if (!IsLicenseValid())
			return CLASS_E_NOTLICENSED;

		if ((pUnkOuter != NULL) && !InlineIsEqualUnknown(riid))
			return CLASS_E_NOAGGREGATION;
		else
			return m_pfnCreateInstance(pUnkOuter, riid, ppvObj);
	}
	// IClassFactory2
	STDMETHOD(CreateInstanceLic)(IUnknown* pUnkOuter, 
	  IUnknown* /* pUnkReserved */, REFIID riid, BSTR bstrKey, 
	  void** ppvObject)
	{
		ATLASSUME(m_pfnCreateInstance != NULL);
		if (ppvObject == NULL)
			return E_POINTER;
		*ppvObject = NULL;
		if ( ((bstrKey != NULL) && !VerifyLicenseKey(bstrKey)) ||
			 ((bstrKey == NULL) && !IsLicenseValid()) )
			return CLASS_E_NOTLICENSED;
		if ((pUnkOuter != NULL) && !InlineIsEqualUnknown(riid))
			return CLASS_E_NOAGGREGATION;
		else
			return m_pfnCreateInstance(pUnkOuter, riid, ppvObject);
	}
	STDMETHOD(RequestLicKey)(DWORD dwReserved, BSTR* pbstrKey)
	{
		if (pbstrKey == NULL)
			return E_POINTER;
		*pbstrKey = NULL;

		if (!IsLicenseValid())
			return CLASS_E_NOTLICENSED;
		return GetLicenseKey(dwReserved,pbstrKey) ? S_OK : E_FAIL;
	}
	STDMETHOD(GetLicInfo)(LICINFO* pLicInfo)
	{
		if (pLicInfo == NULL)
			return E_POINTER;
		pLicInfo->cbLicInfo = sizeof(LICINFO);
		pLicInfo->fLicVerified = IsLicenseValid();
		BSTR bstr = NULL;
		pLicInfo->fRuntimeKeyAvail = GetLicenseKey(0,&bstr);
		::SysFreeString(bstr);
		return S_OK;
	}
	void SetVoid(void* pv)
	{
		m_pfnCreateInstance = (_ATL_CREATORFUNC*)pv;
	}
	_ATL_CREATORFUNC* m_pfnCreateInstance;
};