MFC学习笔记五——消息映射（Message Mapping）

最新推荐文章于 2023-06-30 17:58:45 发布

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本文深入剖析了MFC框架中消息映射机制的实现原理，通过具体的代码示例介绍了不同类之间的消息传递过程。从基类到派生类的消息映射构造方式，展示了MFC如何管理和响应窗口消息。

//------------------------------------------------------------------- // MFC.H //------------------------------------------------------------------- #define TRUE 1 #define FALSE 0 typedef char* LPSTR; typedef const char* LPCSTR; typedef int BOOL; typedef unsigned char BYTE; typedef unsigned short WORD; typedef int INT; typedef unsigned int UINT; typedef long LONG; #define WM_COMMAND 0x0111 #define CObjectid Oxffff #define CCmdTargetid 1 #define CWinThreadid 11 #define CWinAppid 111 #define CMyWinAppid 1111 #define CWndid 12 #define CFrameWndid 121 #define CMyFrameWndid 1211 #define CViewid 122 #define CMyViewid 1221 #define CDocumentid 13 #define CMyDocid 131 #include <iostream> using namespace std; ////////////////////////////////////////////////////////////////// // Window message map handing struct AFX_MSGMAP_ENTRY; struct AFX_MSGMAP { AFX_MSGMAP* pBaseMessageMap; AFX_MSGMAP_ENTRY* lpEntries; }; #define DECLARE_MESSAGE_MAP() / static AFX_MSGMAP_ENTRY _messageEntries[]; / static AFX_MSGMAP messageMap; / virtual AFX_MSGMAP* GetMessageMap() const; #define BEGIN_MESSAGE_MAP(theClass, baseClass) / AFX_MSGMAP* theClass::GetMessageMap() const / { return &theClass::messageMap; } / AFX_MSGMAP theClass::messageMap = / { &(baseClass::messageMap), (AFX_MSGMAP_ENTRY*) &(theClass::_messageEntries) }; / AFX_MSGMAP_ENTRY theClass::_messageEntries[] = / { #define END_MESSAGE_MAP() / { 0, 0, 0, 0, AfxSig_end, (AFX_PMSG)0 } / }; // Message map signature values and macros in separate header #include "AFXMSG_.h" //class CObject; //struct CRuntimeClass //{ // LPCSTR m_lpszClassName; // int m_nObjectSize; // UINT m_wSchema; // CObject* (PASCAL* m_pfnCreateObject)(); // CRuntimeClass* m_pBaseClass; // // CObject* CreateObject(); // static CRuntimeClass* PASCAL Load(); // // static CRuntimeClass* pFirstClass; // CRuntimeClass* m_pNextClass; //}; // //struct AFX_CLASSINIT //{ // AFX_CLASSINIT(CRuntimeClass* pNewClass); //}; // //#define RUNTIME_CLASS(class_name) / // (&class_name::class##class_name) // //#define DECLARE_DYNAMIC(class_name) / // public: / // static CRuntimeClass class##class_name; / // virtual CRuntimeClass* GetRuntimeClass() const; // //#define DECLARE_DYNCREATE(class_name) / // DECLARE_DYNAMIC(class_name) / // static CObject* PASCAL CreateObject(); // //#define _IMPLEMENT_RUNTIMECLASS(class_name,base_class_name,wSchema,pfnNew) / // static char _lpsz##class_name[] = #class_name; / // CRuntimeClass class_name::class##class_name = { / // _lpsz##class_name, sizeof(class_name), wSchema, pfnNew, / // RUNTIME_CLASS(base_class_name), NULL}; / // static AFX_CLASSINIT _init_##class_name(&class_name::class##class_name); / // CRuntimeClass* class_name::GetRuntimeClass() const / // { return &class_name::class##class_name; } / // //#define IMPLEMENT_DYNMIC(class_name, base_class_name) / // _IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, 65535, NULL) // //#define IMPLEMENT_DYNCREATE(class_name, base_class_name) / // CObject* PASCAL class_name::CreateObject() / // { return new class_name; } / // _IMPLEMENT_RUNTIMECLASS(class_name,base_class_name,65535, class_name::CreateObject) class CObject { public: CObject::CObject() { } CObject::~CObject() { } // virtual CRuntimeClass* GetRuntimeClass() const; // BOOL IsKindOf(const CRuntimeClass* pClass) const; // //public: // static CRuntimeClass classCObject; // virtual void SayHello() { cout << "这里是CObject类 /n"; } }; class CCmdTarget : public CObject { /*DECLARE_DYNAMIC(CCmdTarget)*/ public: DECLARE_MESSAGE_MAP() public: CCmdTarget::CCmdTarget() { } CCmdTarget::~CCmdTarget() { } }; typedef void (CCmdTarget::*AFX_PMSG)(void); struct AFX_MSGMAP_ENTRY { UINT nMessage; UINT nCode; UINT nID; UINT nLastID; UINT nSig; AFX_PMSG pfn; }; class CWinThread : public CCmdTarget { /*DECLARE_DYNAMIC(CWinThread)*/ public: CWinThread::CWinThread() { } CWinThread::~CWinThread() { } virtual BOOL InitInstance() { cout << "CWinThread::InitInstance() /n"; return TRUE; } virtual int Run() { cout << "CWinThread::Run() /n"; return 1; } }; class CWnd; class CWinApp : public CWinThread { /*DECLARE_DYNAMIC(CWinApp)*/ public: DECLARE_MESSAGE_MAP() public: CWinApp* m_pCurrentWinApp; CWnd* m_pMainWnd; public: CWinApp::CWinApp() { m_pCurrentWinApp = this; } CWinApp::~CWinApp() { } virtual BOOL InitApplication() { cout << "CWinApp::InitApplication() /n"; return TRUE; } virtual BOOL InitInstance() { cout << "CWinApp::InitInstance() /n"; return TRUE; } virtual int Run() { cout << "CWinApp::Run() /n"; return CWinThread::Run(); } }; typedef void (CWinApp::*AFX_PMSGW)(void); class CDocument : public CCmdTarget { /*DECLARE_DYNAMIC(CDocument)*/ public: DECLARE_MESSAGE_MAP() public: CDocument::CDocument() { } CDocument::~CDocument() { } }; class CWnd : public CCmdTarget { /*DECLARE_DYNCREATE(CWnd)*/ public: DECLARE_MESSAGE_MAP() public: CWnd::CWnd() { /*cout << "CWnd Constructor /n";*/ } CWnd::~CWnd() { } virtual BOOL Create(); BOOL CreateEx(); virtual BOOL PreCreateWindow(); //void SayHello() { cout << "这里是CWnd类 /n"; } }; class CFrameWnd : public CWnd { /*DECLARE_DYNCREATE(CFrameWnd)*/ public: DECLARE_MESSAGE_MAP() public: CFrameWnd::CFrameWnd() { /*cout << "CFrameWnd Constructor /n";*/ } CFrameWnd::~CFrameWnd() { } virtual BOOL Create(); virtual BOOL PreCreateWindow(); //void SayHello() { cout << "这里是CFrameWnd类 /n"; } }; class CView : public CWnd { /*DECLARE_DYNAMIC(CView)*/ public: DECLARE_MESSAGE_MAP() public: CView::CView() { } CView::~CView() { } }; //GLOBAL FUNC CWinApp* AfxGetApp(); //------------------------------------------------------------------- // MY.H //------------------------------------------------------------------- #include <iostream> #include "MFC.h" class CMyWinApp : public CWinApp { public: DECLARE_MESSAGE_MAP() public: CMyWinApp::CMyWinApp() { } CMyWinApp::~CMyWinApp() { } virtual BOOL InitInstance(); }; class CMyFrameWnd : public CFrameWnd { /*DECLARE_DYNCREATE(CMyFrameWnd)*/ public: DECLARE_MESSAGE_MAP() public: CMyFrameWnd::CMyFrameWnd(); CMyFrameWnd::~CMyFrameWnd() { } //void sayHello() { cout << "这里是CMyFrameWnd类 /n"; } }; class CMyDoc : public CDocument { /*DECLARE_DYNCREATE(CMyDoc)*/ public: DECLARE_MESSAGE_MAP() public: CMyDoc::CMyDoc() { /*cout << "CMyDoc constructor /n";*/} CMyDoc::~CMyDoc() { } //void sayHello() { cout << "这里是CMyDoc类 /n"; } }; class CMyView : public CView { /*DECLARE_DYNCREATE(CMyView)*/ public: DECLARE_MESSAGE_MAP() public: CMyView::CMyView() { /*cout << "CMyView constructor /n";*/ } CMyView::~CMyView() { } //void sayHello() { cout << "这里是CMyView类 /n"; } }; //global function //void AfxprintAllClasses(); //------------------------------------------------------------------- // AFXMSG_.H //------------------------------------------------------------------- enum AfxSig_end { AfxSig_end = 0, AfxSig_vv, }; #define ON_COMMAND(id, memberFxn) / { WM_COMMAND, 0, (WORD)id, (WORD)id, AfxSig_vv, (AFX_PMSG)memberFxn }, //------------------------------------------------------------------- // MFC.CPP //------------------------------------------------------------------- #include "my.h" extern CMyWinApp theApp; //static char szCObject[] = "CObject"; //struct CRuntimeClass CObject::classCObject = { szCObject, sizeof(CObject),65535,NULL, NULL, NULL}; //static AFX_CLASSINIT _init_CObject(&CObject::classCObject); // //CRuntimeClass* CRuntimeClass::pFirstClass = NULL; // //AFX_CLASSINIT::AFX_CLASSINIT(CRuntimeClass* pNewClass) //{ // pNewClass->m_pNextClass = CRuntimeClass::pFirstClass; // CRuntimeClass::pFirstClass = pNewClass; //} // //CObject* CRuntimeClass::CreateObject() //{ // if (m_pfnCreateObject == NULL) // { // TRACE1("错误：试图创建的对象不存在：%hs./n",m_lpszClassName); // return NULL; // } // CObject* pObject = NULL; // pObject = (*m_pfnCreateObject)(); // return pObject; //} // //CRuntimeClass* PASCAL CRuntimeClass::Load() //{ // char szClassName[64]; // CRuntimeClass* pClass; // cout << " 输入一个类名" ; // cin >> szClassName; // for(pClass = pFirstClass;pClass!=NULL;pClass=pClass->m_pNextClass) // { // if (strcmp(szClassName, pClass->m_lpszClassName)==0) // return pClass; // } // TRACE1("错误：没有找到匹配的类：%s /n",szClassName); // return NULL; //} // //CRuntimeClass* CObject::GetRuntimeClass()const //{ // return &CObject::classCObject; //} // //BOOL CObject::IsKindOf(const CRuntimeClass* pClass) const //{ // CRuntimeClass* pClassThis = GetRuntimeClass(); // while (pClassThis!=NULL) // { // if (pClassThis==pClass) // { // return TRUE; // } // pClassThis = pClassThis->m_pBaseClass; // } // return FALSE; //} BOOL CWnd::Create() { cout << "CWnd::Create() /n"; return TRUE; } BOOL CWnd::CreateEx() { cout << "CWnd::CreateEx() /n"; PreCreateWindow(); return TRUE; } BOOL CWnd::PreCreateWindow() { cout << "CWnd::PreCreateWindow() /n"; return TRUE; } BOOL CFrameWnd::Create() { cout << "CFrameWnd::Create() /n"; CreateEx(); return TRUE; } BOOL CFrameWnd::PreCreateWindow() { cout << "CFrameWnd::PreCreateWindow() /n"; return TRUE; } CWinApp* AfxGetApp() { return theApp.m_pCurrentWinApp; } //IMPLEMENT_DYNMIC(CCmdTarget, CObject) //IMPLEMENT_DYNMIC(CWinThread, CCmdTarget) //IMPLEMENT_DYNMIC(CWinApp, CWinThread) //IMPLEMENT_DYNMIC(CDocument, CCmdTarget) //IMPLEMENT_DYNCREATE(CWnd, CCmdTarget) //IMPLEMENT_DYNMIC(CView, CWnd) //IMPLEMENT_DYNCREATE(CFrameWnd, CWnd) AFX_MSGMAP* CCmdTarget::GetMessageMap() const { return &CCmdTarget::messageMap; } AFX_MSGMAP CCmdTarget::messageMap = { NULL, &CCmdTarget::_messageEntries[0] }; AFX_MSGMAP_ENTRY CCmdTarget::_messageEntries[] = { {0, 0, CCmdTargetid, 0, AfxSig_end, 0 } }; BEGIN_MESSAGE_MAP(CWnd, CCmdTarget) ON_COMMAND(CWndid, 0) END_MESSAGE_MAP() BEGIN_MESSAGE_MAP(CFrameWnd, CWnd) ON_COMMAND(CFrameWndid, 0) END_MESSAGE_MAP() BEGIN_MESSAGE_MAP(CDocument, CCmdTarget) ON_COMMAND(CDocumentid, 0) END_MESSAGE_MAP() BEGIN_MESSAGE_MAP(CView, CWnd) ON_COMMAND(CViewid, 0) END_MESSAGE_MAP() BEGIN_MESSAGE_MAP(CWinApp, CCmdTarget) ON_COMMAND(CWinAppid, 0) END_MESSAGE_MAP() //------------------------------------------------------------------- // MY.CPP //------------------------------------------------------------------- #include "MY.h" CMyWinApp theApp; BOOL CMyWinApp::InitInstance() { cout << "CMyWinApp::InitInstance() /n"; m_pMainWnd = new CMyFrameWnd; return TRUE; } CMyFrameWnd::CMyFrameWnd() { //cout << "CMyDoc constructor /n"; Create(); } //IMPLEMENT_DYNCREATE(CMyFrameWnd,CFrameWnd) //IMPLEMENT_DYNCREATE(CMyDoc,CDocument) //IMPLEMENT_DYNCREATE(CMyView,CView) BEGIN_MESSAGE_MAP(CMyWinApp, CWinApp) ON_COMMAND(CMyWinAppid, 0) END_MESSAGE_MAP() BEGIN_MESSAGE_MAP(CMyFrameWnd, CFrameWnd) ON_COMMAND(CMyFrameWndid, 0) END_MESSAGE_MAP() BEGIN_MESSAGE_MAP(CMyView, CView) ON_COMMAND(CMyViewid, 0) END_MESSAGE_MAP() BEGIN_MESSAGE_MAP(CMyDoc, CDocument) ON_COMMAND(CMyDocid, 0) END_MESSAGE_MAP() void printlpEntries(AFX_MSGMAP_ENTRY* lpEntrt) { struct { int classid; char* classname; } classinfo[] = { CCmdTargetid, "CCmdTarget", CWinThreadid, " CWinThread", CWinAppid, "CWinApp", CMyWinAppid, "CMyWinApp", CWndid, "CWnd", CFrameWndid, "CFrameWnd", CMyFrameWndid, "CMyFrameWnd", CViewid, "CView", CMyViewid, "CMyView", CDocumentid, "CDocument", CMyDocid, "CMyDoc", 0, "" }; for (int i = 0; classinfo[i].classid!=0; i++) { if (classinfo[i].classid == lpEntrt->nID) { cout << lpEntrt->nID << " "; cout << classinfo[i].classname << endl; break; } } } void MsgMapPrinting(AFX_MSGMAP* pMessageMap) { for (; pMessageMap!=NULL; pMessageMap=pMessageMap->pBaseMessageMap) { AFX_MSGMAP_ENTRY* lpEntry = pMessageMap->lpEntries; printlpEntries(lpEntry); } } //void PrintAllClasses() //{ // CRuntimeClass* pClass; // for (pClass = CRuntimeClass::pFirstClass; pClass!=NULL; pClass = pClass->m_pNextClass) // { // cout<<pClass->m_lpszClassName<<endl; // cout<<pClass->m_nObjectSize<<endl; // cout<<pClass->m_wSchema<<endl; // } //} //------------------------------------------------------------------- // main //------------------------------------------------------------------- void main() { CWinApp* pApp = AfxGetApp(); pApp->InitApplication(); pApp->InitInstance(); pApp->Run(); CMyDoc* pMyDoc = new CMyDoc; CMyView* pMyView = new CMyView; CMyFrameWnd* pMyFrameWnd = (CMyFrameWnd*)pApp->m_pMainWnd; // output Message Map construction AFX_MSGMAP* pMessageMap = pMyView->GetMessageMap(); cout << endl << "CMyView Message Map : " << endl; MsgMapPrinting(pMessageMap); pMessageMap = pMyDoc->GetMessageMap(); cout << endl << "CMyDoc Message Map : " << endl; MsgMapPrinting(pMessageMap); pMessageMap = pMyFrameWnd->GetMessageMap(); cout << endl << "CMyFrameWnd Message Map : " << endl; MsgMapPrinting(pMessageMap); pMessageMap = pApp->GetMessageMap(); cout << endl << "CMyWinApp Message Map : " << endl; MsgMapPrinting(pMessageMap); //CRuntimeClass* pClassRef; //CObject* pOb; //while (1) //{ // if ((pClassRef = CRuntimeClass::Load())== NULL) // { // break; // } // pOb = pClassRef->CreateObject(); // if (pOb!=NULL) // { // pOb->SayHello(); // } //} }

CWinApp::InitApplication()

CMyWinApp::InitInstance()

CFrameWnd::Create()

CWnd::CreateEx()

CFrameWnd::PreCreateWindow()

CWinApp::Run()

CWinThread::Run()

CMyView Message Map :

1221 CMyView

122 CView

12 CWnd

1 CCmdTarget