一、关于DECLARE_MESSAGE_MAP宏定义使用MFC向导，在ApplicationType页面选择DialogBased，生成一个对话框项目，Dialog类命名为CCapturePacketDlg，在CCapturePacketDlg.cpp中自动产生下列代码：

   2.   再来分析BEGIN_MESSAGE_MAP(CCapturePacketDlg, CDialog)，在“afxwin.h”中有定义：

2.1 PTM_WARNING_DISABLE： #define PTM_WARNING_DISABLE \ __pragma(warning( push ))  \ //#pragma warning( push [ ,n ] ),Where n represents a warning level (1 through 4).                                               //The pragma warning( push ) stores the current warning state for all warnings. __pragma(warning( disable : 4867 ))//Do not issue the specified warning message(s).//http://msdn2.microsoft.com/en-us/2c8f766e.aspx// Allows selective modification of the behavior of compiler warning messages.3.1 struct AFX_MSGMAP {  3.1.1 const AFX_MSGMAP* (PASCAL* pfnGetBaseMap)();  3.1.2 const AFX_MSGMAP_ENTRY* lpEntries; };3.1.2 struct AFX_MSGMAP_ENTRY {  UINT nMessage;   // windows message  UINT nCode;      // control code or WM_NOTIFY code  UINT nID;        // control ID (or 0 for windows messages)  UINT nLastID;    // used for entries specifying a range of control id's  UINT_PTR nSig;       // signature type (action) or pointer to message #  3.1.2.1 AFX_PMSG pfn;    // routine to call (or special value) }; 3.1.2.1 typedef void (AFX_MSG_CALL CCmdTarget::*AFX_PMSG)(void);5.1 #define PASCAL      __stdcall将BEGIN_MESSAGE_MAP(CCapturePacketDlg, CDialog)完全展开：

   3    最后分析END_MESSAGE_MAP()，在“afxwin.h”中有定义：

2.1 AfxSig_end：enum AfxSig.AfxSig_end = 02.2 AFX_PMSG：typedef void (AFX_MSG_CALL CCmdTarget::*AFX_PMSG)(void);//函数指针4.1 struct AFX_MSGMAP {  const AFX_MSGMAP* (PASCAL* pfnGetBaseMap)();  const AFX_MSGMAP_ENTRY* lpEntries; };8.1 #define PTM_WARNING_RESTORE \ __pragma(warning( pop ))//pop restores the state of all warnings (including 4705, 4706, and 4707) to what it was at the beginning of the code.·最后将

 1//in header file 2class CView : public CWnd 3{ 4public: 5    static CRuntimeClass classCView; 6    virtual CRuntimeClass* GetRuntimeClass() const; 7    //…… 8}; 9//in implementation file10static char_lpszCView = "CView";11CRuntimeClass CView::classCView =12{13    _lpszCView14    , sizeof(CView)15    , 0xFFF16    , NULL17    , &CWnd::classCWnd18    , NULL19};20static AFX_CLASSINIT _init_CView(&CView::classCView)21{22    (&CView::classCView)->m_pNextClass = CRuntimeClass::pFirstClass;23    CRuntimeClass::pFirstClass = &CView::classCView;24}25CRuntimeClass* CView::GetRuntimeClass() const26{27    return &CView::classCView;28}其中他将CRuntimeClass简化定义为：struct CRuntimeClass{// Attributes        LPCSTR m_lpszClassName;        int m_nObjectSize;        UINT m_wSchema; // schema number of the loaded class        CObject* (PASCAL* m_pfnCreateObject)(); // NULL => abstract class        CRuntimeClass* m_pBaseClass;

        // CRuntimeClass objects linked together in simple list        static CRuntimeClass* pFirstClass; // start of class list        CRuntimeClass* m_pNextClass;       // linked list of registered classes};