090911（星期五）：RTTI运行时类型识别

RTTI运行时类型识别

 

// in MFC.H

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

};

 

CRuntimeClass结构，描述类别目录的链表。

 

#define DECLARE_DYNAMIC(class_name) /

public: /

static CRuntimeClass class##class_name; /

virtual CRuntimeClass* GetRuntimeClass() const;

 

##的意思是把前后两个字符串系在一起。

 

#define IMPLEMENT_DYNAMIC(class_name, base_class_name) /

_IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, 0xFFFF, NULL)

 

#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 RUNTIME_CLASS(class_name) /

(&class_name::class##class_name)

 

看了半天也没发现究竟什么用。没看懂，需要用的时候再回来吧。