标签：class blog code http color get
之前在借助模板类自动实现COM连接点接收器（Sink）中对原作者的代码进一步封装，弄清了连接点使用的原理，在看ATL代码的过程中，发现ATL本身就提供了AtlAdvise/AtlUnadvise这样的机制来简化连接点的使用，CComPtrBase中也有Advise这个成员函数，它是对AtlAdvise，进一步封装，因此，对ConnectionHelper的代码可以再简化，简化后Connect()只有十来行了。原作者写的GetConnectPoint函数也用不上了。
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#if !defined( __sinkimpl_h_INCLUDED__ )#define __sinkimpl_h_INCLUDED__ #if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000template<typename
T, typename
EventInterface, const
GUID * evtLibID = NULL >class
ATL_NO_VTABLE CSinkImpT : public
CComObjectRootEx<CComSingleThreadModel> , public
CComCoClass<CSinkImpT<T, EventInterface, evtLibID>, &__uuidof(T)> , public
IDispatchImpl < EventInterface, &__uuidof(EventInterface), evtLibID >{public: CSinkImpT() {} virtual
~CSinkImpT() {} typedef
IDispatchImpl<EventInterface, &__uuidof(EventInterface), evtLibID> _parentClass; typedef
CSinkImpT<T, EventInterface, evtLibID> _thisClass; STDMETHOD( Invoke )(DISPID dispidMember, REFIID riid, LCID
lcid, WORD
wFlags, DISPPARAMS* pdispparams, VARIANT* pvarResult, EXCEPINFO* pexcepinfo, UINT* puArgErr) { T * pThis = static_cast<T *>(this); return
pThis->DoInvoke( dispidMember, riid, lcid, wFlags, pdispparams, pvarResult, pexcepinfo, puArgErr ); } DECLARE_NO_REGISTRY() DECLARE_PROTECT_FINAL_CONSTRUCT() BEGIN_COM_MAP( _thisClass ) COM_INTERFACE_ENTRY( IDispatch ) COM_INTERFACE_ENTRY( EventInterface ) END_COM_MAP(); STDMETHOD( DoInvoke )(DISPID dispidMember, REFIID riid, LCID
lcid, WORD
wFlags, DISPPARAMS* pdispparams, VARIANT* pvarResult, EXCEPINFO* pexcepinfo, UINT* puArgErr) { return
_parentClass::Invoke( dispidMember, riid, lcid, wFlags, pdispparams, pvarResult, pexcepinfo, puArgErr ); }};///////////////////////////////////////////////////////////////////////////////////////////////////////// ComDllLib::ITestComPtr pCom;// HRESULT hr = pCom.CreateInstance( L"Test.Com" );// ConnectionPointHelper<ComDllLib::ITestCom, ComDllLib::_ITestComEvent, CSink3> cph( pCom );//template<typename
EventInterface, typename
EventProcessor>class
ConnectionPointHelper{ CComPtr<IUnknown> m_spInterface; DWORD
m_dwCookie;public: ConnectionPointHelper( IUnknown* pInterface ) : m_spInterface( pInterface ), m_dwCookie( 0 ) { Connect(); } ~ConnectionPointHelper() { Disconnect(); }protected: void
Connect() { HRESULT
hr = E_FAIL; do { if
( m_spInterface == NULL || m_dwCookie != 0 ) { break; } CComObject<EventProcessor> * pTmp = NULL; hr = CComObject<EventProcessor>::CreateInstance( &pTmp ); if
( FAILED( hr ) ){ break; } CComQIPtr<IUnknown, &IID_IUnknown> spSink( pTmp ); hr = m_spInterface.Advise( spSink, __uuidof(EventInterface), &m_dwCookie ); } while
( FALSE ); } void
Disconnect() { HRESULT
hr = E_FAIL; do
{ if
( m_dwCookie == 0 ) { break; } AtlUnadvise( m_spInterface, __uuidof(EventInterface), m_dwCookie ); m_dwCookie = 0; } while
( FALSE ); }};#endif // !defined( __sinkimpl_h_INCLUDED__ ) |
以上就是全部代码，减少到不到100行。
使用方法：
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{ // .tlh中的接口方式调用 ComDllLib::ITestComPtr pCom; CComPtr<IUnknown> pUnknown; HRESULT
hr = pCom.CreateInstance( L"Test.Com"
); if
( SUCCEEDED( hr ) ) { hr = pCom->QueryInterface( IID_IUnknown, reinterpret_cast<void**>(&pUnknown) ); if
( SUCCEEDED( hr ) ) { ConnectionPointHelper<ComDllLib::_ITestComEvent, CSink3> cph( pUnknown ); LONG
c = pCom->Add( 1, 5 ); } }} |
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{ // IDispatch方式调用 CComPtr<IDispatch> spDisp; HRESULT
hr = spDisp.CoCreateInstance( L"Test.Com"
); if
( SUCCEEDED( hr ) ) { CComQIPtr<IUnknown, &IID_IUnknown> spUnknown( spDisp ); ConnectionPointHelper<ComDllLib::_ITestComEvent, CSink3> cph( spUnknown ); _variant_t ret; _variant_t m = 2, n = 3; spDisp.Invoke2( (LPCOLESTR) L"Add", &m, &n, &ret ); }} |
借助模板类自动实现COM连接点接收器（Sink）更新,布布扣,bubuko.com
标签：class blog code http color get
原文地址：http://www.cnblogs.com/honker/p/3778288.html
