implement_dyncreate_on_cbn_editchange_cbrush(2)

#ifdef _AFXDLL
#define DECLARE_DYNAMIC(class_name) \
protected: \
	static CRuntimeClass* PASCAL _GetBaseClass(); \
public: \
	static const CRuntimeClass class##class_name; \
	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

让我们来逐行分析一下，首先来看“static CRuntimeClass class##class_name;”这个语句，其声明一个类型为CRuntimeClass的静态public成员变量，变量名是由字符串"class"与所指定的类的类名组成。

举例而言，如果你写DECLARE_DYNAMIC(CMyView)，则等于声明了一个静态变量

static CRuntimeClass classCMyView

然后是“virtual CRuntimeClass* GetRuntimeClass() const;”语句，其声明一个虚函数，函数名为GetRuntimeClass，返回为CRuntimeClass类型的指针，无形参，并且是个const函数。

#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); }

#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 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); }

#define _IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, wSchema, pfnNew, class_init) \
	AFX_COMDAT 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

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