CComCoClass

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最新推荐文章于 2023-03-15 14:38:20 发布

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CComCoClass是一个模板类，用于简化COM组件的创建和错误报告。它提供了声明类工厂、聚合、错误报告以及实例创建的方法。通过DECLARE_CLASSFACTORY()、DECLARE_AGGREGATABLE(T)宏，可以便捷地实现COM对象的创建和聚合行为。同时，提供了多个Error静态方法用于生成错误信息，使用AtlReportError进行报告。CreateInstance模板方法则用于根据传入的接口类型创建对象实例。

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template <class T, const CLSID* pclsid = &CLSID_NULL>
class CComCoClass
{
public:
	DECLARE_CLASSFACTORY()
	DECLARE_AGGREGATABLE(T)
	typedef T _CoClass;
	static const CLSID& WINAPI GetObjectCLSID() {return *pclsid;}
	static LPCTSTR WINAPI GetObjectDescription() {return NULL;}
	static HRESULT WINAPI Error(LPCOLESTR lpszDesc,
		const IID& iid = GUID_NULL, HRESULT hRes = 0)
	{
		return AtlReportError(GetObjectCLSID(), lpszDesc, iid, hRes);
	}
	static HRESULT WINAPI Error(LPCOLESTR lpszDesc, DWORD dwHelpID,
		LPCOLESTR lpszHelpFile, const IID& iid = GUID_NULL, HRESULT hRes = 0)
	{
		return AtlReportError(GetObjectCLSID(), lpszDesc, dwHelpID, lpszHelpFile,
			iid, hRes);
	}
	static HRESULT WINAPI Error(UINT nID, const IID& iid = GUID_NULL,
		HRESULT hRes = 0, HINSTANCE hInst = _AtlBaseModule.GetResourceInstance())
	{
		return AtlReportError(GetObjectCLSID(), nID, iid, hRes, hInst);
	}
	static HRESULT WINAPI Error(UINT nID, DWORD dwHelpID,
		LPCOLESTR lpszHelpFile, const IID& iid = GUID_NULL,
		HRESULT hRes = 0, HINSTANCE hInst = _AtlBaseModule.GetResourceInstance())
	{
		return AtlReportError(GetObjectCLSID(), nID, dwHelpID, lpszHelpFile,
			iid, hRes, hInst);
	}
	static HRESULT WINAPI Error(LPCSTR lpszDesc,
		const IID& iid = GUID_NULL, HRESULT hRes = 0)
	{
		return AtlReportError(GetObjectCLSID(), lpszDesc, iid, hRes);
	}
	static HRESULT WINAPI Error(LPCSTR lpszDesc, DWORD dwHelpID,
		LPCSTR lpszHelpFile, const IID& iid = GUID_NULL, HRESULT hRes = 0)
	{
		return AtlReportError(GetObjectCLSID(), lpszDesc, dwHelpID,
			lpszHelpFile, iid, hRes);
	}
	template <class Q>
	static HRESULT CreateInstance(IUnknown* punkOuter, Q** pp)
	{
		return T::_CreatorClass::CreateInstance(punkOuter, __uuidof(Q), (void**) pp);
	}
	template <class Q>
	static HRESULT CreateInstance(Q** pp)
	{
		return T::_CreatorClass::CreateInstance(NULL, __uuidof(Q), (void**) pp);
	}
};