模拟MFC命令消息机制的事件机制

 为了携带更多参数在线程间调用过程，我最近模仿windows的MFC命令机制，写了一个简单的事件机制  

分为事件消息接收器，事件转发器，事件处理器等。主要代码如下

1. JrEvent.h

#pragma once #define EVENT_MSG WM_USER + 0X100 typedef UINT EVENT_CODE; typedef HANDLE HEVENT; struct EventParam { void* PInParamBuf;//输入 void* pOutParamBuf; //输出 bool bSuccess; bool bSyncCall; HEVENT hNotifyEvent;//调用完成通知事件(用于异步调用） bool bCalleeReleaseMem; //指示是否由被调用者释放内存，具体是否释放，可综合设计，由具体的事件处理器考虑 EventParam() { PInParamBuf = NULL; pOutParamBuf = NULL; bSuccess = false; bSyncCall = true; hNotifyEvent = NULL; bCalleeReleaseMem = false; }; }; typedef EventParam *PEventParam; class CJrEventSink; typedef void (CJrEventSink::*JMC_EVENTFUNC)(PEventParam); struct JMC_EVENTMAP_ENTRY { UINT nEventCode; JMC_EVENTFUNC lpEventFunc; }; struct JMC_EVENTMAP { const JMC_EVENTMAP* (PASCAL* pfnGetBaseMap)(); const JMC_EVENTMAP_ENTRY* lpEntries; }; #define DECLARE_JMC_EVENT_MAP() / private: / static const JMC_EVENTMAP_ENTRY _eventEntries[]; / protected: / static const JMC_EVENTMAP eventMap; / static const JMC_EVENTMAP* PASCAL GetThisEventMap(); / virtual const JMC_EVENTMAP* GetEventMap() const; #define BEGIN_JMC_EVENT_MAP(theClass, baseClass) / const JMC_EVENTMAP* PASCAL theClass::GetThisEventMap()/ { return &theClass::eventMap; } / const JMC_EVENTMAP* theClass::GetEventMap() const / { return &eventMap; } / const JMC_EVENTMAP theClass::eventMap = / { &(baseClass::GetThisEventMap), theClass::_eventEntries,};/ const JMC_EVENTMAP_ENTRY theClass::_eventEntries[] = / { #define END_JMC_EVENT_MAP() / {0, NULL }, / }; #define ON_JMC_EVENT(id, memberFxn)/ { (EVENT_CODE)id, static_cast<JMC_EVENTFUNC>(memberFxn)},

2. receicver, router.h

#include "JrEvent.h" #include <list> class JRTL_API CJrEventRouterWnd : public CWnd { DECLARE_DYNAMIC(CJrEventRouterWnd) public: CJrEventRouterWnd(){} virtual ~CJrEventRouterWnd(){} virtual void CreateEventSinks() = 0; std::list<CJrEventSink*> m_sinks; protected: DECLARE_MESSAGE_MAP(); afx_msg LRESULT OnEventMsg(WPARAM wp_, LPARAM lp_); }; class JRTL_API CJrEventReceiver { public: CJrEventReceiver(void); virtual ~CJrEventReceiver(void); LRESULT SynEventProcess(EVENT_CODE nCode_, PEventParam pParam_); BOOL AsynEventProcess(EVENT_CODE nCode_, PEventParam pParam_); protected: virtual CJrEventRouterWnd* GetEventRouterWnd() = 0; };

3. receiver, router.cpp

#include "StdAfx.h" #include "JrEventReceiver.h" IMPLEMENT_DYNAMIC(CJrEventRouterWnd, CWnd) BEGIN_MESSAGE_MAP(CJrEventRouterWnd, CWnd) ON_MESSAGE(EVENT_MSG, OnEventMsg) END_MESSAGE_MAP() LRESULT CJrEventRouterWnd::OnEventMsg(WPARAM wp_, LPARAM lp_) { bool bFind = false; PEventParam pEP = (PEventParam)lp_; for (std::list<CJrEventSink*>::iterator _it = m_sinks.begin(); _it != m_sinks.end(); ++_it) { if ((*_it)->OnEventMsg((EVENT_CODE)wp_, pEP)) { if (pEP->hNotifyEvent) { //... } bFind = true; } } if (pEP->bCalleeReleaseMem) { //... } return bFind ? 0; -1; } CJrEventReceiver::CJrEventReceiver(void) { } CJrEventReceiver::~CJrEventReceiver(void) { } LRESULT CJrEventReceiver::SynEventProcess(EVENT_CODE nCode_, PEventParam pParam_) { CJrEventRouterWnd* _pRouter = GetEventRouterWnd(); if (!_pRouter || !_pRouter->GetSafeHwnd()) { if (pParam->hNotifyEvent) { //... } if (pParam->bCalleeReleaseMem) { //... } return -1; } return _pRouter->SendMessage(EVENT_MSG, nCode_, (LPARAM)pParam_); } BOOL CJrEventReceiver::AsynEventProcess(EVENT_CODE nCode_, PEventParam pParam_) { CJrEventRouterWnd* _pRouter = GetEventRouterWnd(); if (!_pRouter || !_pRouter->GetSafeHwnd()) { if (pParam->hNotifyEvent) { //... } if (bCalleeReleaseMem) { //... } return FALSE; } return _pRouter->PostMessage(EVENT_MSG, nCode_, (LPARAM)pParam_); }

4. sink基类.h

 #pragma once #include "JRtl.h" #include "JrEvent.h" class JRTL_API CJrEventSink { public: CJrEventSink(void); virtual ~CJrEventSink(void); virtual BOOL OnEventMsg(EVENT_CODE nEventCode_, EventParam* pEventParam_); DECLARE_JMC_EVENT_MAP() };

5. sink基类.cpp

#include "StdAfx.h" #include "JrEventSink.h" const JMC_EVENTMAP CJrEventSink::eventMap = { NULL, &CJrEventSink::_eventEntries[0], }; const JMC_EVENTMAP_ENTRY CJrEventSink::_eventEntries[] = { { 0, NULL } // nothing here }; CJrEventSink::CJrEventSink(void) { } CJrEventSink::~CJrEventSink(void) { } const JMC_EVENTMAP* CJrEventSink::GetEventMap() const { return &eventMap; } const JMC_EVENTMAP* PASCAL CJrEventSink::GetThisEventMap() { return &eventMap; } BOOL CJrEventSink::OnEventMsg(EVENT_CODE nEventCode_, EventParam* pEventParam_) { for (const JMC_EVENTMAP* pMap = GetEventMap(); pMap != NULL; pMap = (*pMap->pfnGetBaseMap)()) { const JMC_EVENTMAP_ENTRY* pEntry = pMap->lpEntries; while (pEntry->nEventCode) { if (nEventCode_ == pEntry->nEventCode) { if (!pEntry->lpEventFunc) { ASSERT(FALSE); return FALSE; } (this->*(pEntry->lpEventFunc))(pEventParam_); //??? return TRUE; } pEntry++; } if (NULL == (pMap->pfnGetBaseMap)) return FALSE; } return FALSE; }

6. 具体sink类

class CMySink : public CJrEventSink { public: CMySink(void); public: virtual ~CMySink(void); protected: DECLARE_JMC_EVENT_MAP() void OnMyEvent(PEventParam pParam_); }; //.CPP BEGIN_JMC_EVENT_MAP(CMySink, CJrEventSink) ON_JMC_EVENT(EVENT_XXX, &CMySink::OnMyEvent) END_JMC_EVENT_MAP() CMySink::CMySink(void) { } CMySink::~CMySink(void) { } void CMySink::OnMyEvent(PEventParam pParam_) { TRACE(_T("onMYEVENT Not Implement/n")); }