DECLARE_DYNAMIC/IMPLEMENT_DYNAMIC宏

DECLARE_DYNAMIC宏定义：

#ifdef _AFXDLL
#define DECLARE_DYNAMIC(class_name) \
protected: \
 static CRuntimeClass* PASCAL _GetBaseClass(); \
public: \
 static const CRuntimeClass class##class_name; \   //宏定义中的##用来告诉编译器，把两个字符串系在一起
 static CRuntimeClass* PASCAL GetThisClass(); \
  virtual CRuntimeClass* GetRuntimeClass() const; \

#define _DECLARE_DYNAMIC(class_name) \
protected: \
 static CRuntimeClass* PASCAL _GetBaseClass(); \
public: \
 static CRuntimeClass class##class_name; \
 static CRuntimeClass* PASCAL GetThisClass(); \
 virtual CRuntimeClass* GetRuntimeClass() const; \

#else
#define DECLARE_DYNAMIC(class_name) \
public: \
 static const CRuntimeClass class##class_name; \
 virtual CRuntimeClass* GetRuntimeClass() const; \

#define _DECLARE_DYNAMIC(class_name) \
public: \
 static CRuntimeClass class##class_name; \
 virtual CRuntimeClass* GetRuntimeClass() const; \

#endif

IMPLEMENT_DYNAMIC宏定义：

#define IMPLEMENT_DYNAMIC(class_name, base_class_name) \
 IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, 0xFFFF, NULL, NULL)                                         

其中IMPLEMENT_RUNTIMECLASS宏定义为：

#ifdef _AFXDLL
#define IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, wSchema, pfnNew, class_init) \
 CRuntimeClass* PASCAL class_name::_GetBaseClass() \
  { return RUNTIME_CLASS(base_class_name); } \
 AFX_COMDAT const CRuntimeClass class_name::class##class_name = { \
  #class_name, sizeof(class class_name), wSchema, pfnNew, \
   &class_name::_GetBaseClass, NULL, class_init }; \
 CRuntimeClass* PASCAL class_name::GetThisClass() \
  { return _RUNTIME_CLASS(class_name); } \
 CRuntimeClass* class_name::GetRuntimeClass() const \
  { return _RUNTIME_CLASS(class_name); } \

#else
#define IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, wSchema, pfnNew, class_init) \
 AFX_COMDAT const CRuntimeClass class_name::class##class_name = { \
  #class_name, sizeof(class class_name), wSchema, pfnNew, \
   RUNTIME_CLASS(base_class_name), NULL, class_init }; \
 CRuntimeClass* class_name::GetRuntimeClass() const \
  { return RUNTIME_CLASS(class_name); } \

#endif

其中又导出下面几个宏：

#define _RUNTIME_CLASS(class_name) ((CRuntimeClass*)(&class_name::class##class_name))

#ifdef _AFXDLL
#define RUNTIME_CLASS(class_name) (class_name::GetThisClass())
#else
#define RUNTIME_CLASS(class_name) _RUNTIME_CLASS(class_name)
#endif

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