MFC中消息映射MESSAGE_MAP宏

#define DECLARE_MESSAGE_MAP() \
protected: \
 static const AFX_MSGMAP* PASCAL GetThisMessageMap(); \
 virtual const AFX_MSGMAP* GetMessageMap() const; \

#define BEGIN_MESSAGE_MAP(theClass, baseClass) \
 PTM_WARNING_DISABLE \
 const AFX_MSGMAP* theClass::GetMessageMap() const \
  { return GetThisMessageMap(); } \
 const AFX_MSGMAP* PASCAL theClass::GetThisMessageMap() \
 { \
  typedef theClass ThisClass;         \
  typedef baseClass TheBaseClass;        \
  static const AFX_MSGMAP_ENTRY _messageEntries[] =  \
  {

#define END_MESSAGE_MAP() \
  {0, 0, 0, 0, AfxSig_end, (AFX_PMSG)0 } \
 }; \
  static const AFX_MSGMAP messageMap = \
  { &TheBaseClass::GetThisMessageMap, &_messageEntries[0] }; \
  return &messageMap; \
 }          \
 PTM_WARNING_RESTORE

其中AFX_MSGMAP结构为：

struct AFX_MSGMAP
{
 const AFX_MSGMAP* (PASCAL* pfnGetBaseMap)();
 const AFX_MSGMAP_ENTRY* lpEntries;
};

AFX_MSGMAP_ENTRY结构为：

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 #
 AFX_PMSG pfn;    // routine to call (or special value)
};

此宏存在于头文件AFXWIN.H中。

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