请解决 VC 宏的问题？ 非常感谢！

[arfu]

如何理解RUNTIME_CLASS()宏的作用？
怎样用呢？

[littletao]

其实这是类定义的一个基本宏，只有通过它才能把基类和继承的类连接起来。
候俊杰的书对这部分介绍得很仔细，可以去查查。

[Gray_Bit]

// 一个RUNTIME_CLASS()应用代码段
// Get run time informations via runtime_class macro
CRuntimeClass * pRTCViewSmall = RUNTIME_CLASS(CTSHEditViewSmall);
#ifdef _DEBUG
ASSERT_VALID(this);
ASSERT(pRTCViewSmall != NULL);
ASSERT(AfxIsValidAddress(pRTCViewSmall,sizeof(CRuntimeClass),FALSE));
ASSERT(pRTCViewSmall->IsDerivedFrom(RUNTIME_CLASS(CWnd)));
#endif
// Create a c++ object dynamicly
CTSHEditViewSmall* pTSHEditViewSmall = NULL;
TRY
{
pTSHEditViewSmall = (CTSHEditViewSmall*) pRTCViewSmall->CreateObject();
if(pTSHEditViewSmall == NULL) AfxThrowMemoryException();
}
CATCH_ALL(e)
{
TIP("Out of memory creating a view .");
return -1;
}
END_CATCH_ALL

[茂奇软件]

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


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

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

///////////////////////////////////////
#define DECLARE_DYNCREATE(class_name) \
DECLARE_DYNAMIC(class_name) \
static CObject* PASCAL CreateObject();

#define IMPLEMENT_DYNCREATE(class_name, base_class_name) \
CObject* PASCAL class_name::CreateObject() \
{ return new class_name; } \
IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, 0xFFFF, \
class_name::CreateObject)

///////////////////////////////////////
#define IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, wSchema, pfnNew) \
CRuntimeClass* PASCAL class_name::_GetBaseClass() \
{ return RUNTIME_CLASS(base_class_name); } \
const AFX_DATADEF CRuntimeClass class_name::class##class_name = { \
#class_name, sizeof(class class_name), wSchema, pfnNew, \
&class_name::_GetBaseClass, NULL }; \
CRuntimeClass* class_name::GetRuntimeClass() const \
{ return RUNTIME_CLASS(class_name); } \


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

///////////////////////////////////////
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
#ifdef _AFXDLL
CRuntimeClass* (PASCAL* m_pfnGetBaseClass)();
#else
CRuntimeClass* m_pBaseClass;
#endif

// Operations
CObject* CreateObject();
BOOL IsDerivedFrom(const CRuntimeClass* pBaseClass) const;

// Implementation
void Store(CArchive& ar) const;
static CRuntimeClass* PASCAL Load(CArchive& ar, UINT* pwSchemaNum);

// CRuntimeClass objects linked together in simple list
CRuntimeClass* m_pNextClass; // linked list of registered classes
}