#define宏展开结果

－－－－－fileName: test.cpp－－－－－－－
#define Conn(x,y) x##y
#define ToChar(x)
#define ToString(x) #x
#define RUNTIME_CLASS(class_name) \
        (&class_name::class##class_name)

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

#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 IMPLEMENT_DYNAMIC(class_name, base_class_name) \
        _IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, 0xFFFF, NULL)
       
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
};

struct AFX_CLASSINIT
        { AFX_CLASSINIT(CRuntimeClass* pNewClass); };

class CObject
{
public:
  CObject::CObject()  {
                      }
  CObject::~CObject() {
                      }

  virtual CRuntimeClass* GetRuntimeClass() const;

public:
  static CRuntimeClass classCObject;
};

class CCmdTarget : public CObject
{
        DECLARE_DYNAMIC(CCmdTarget)
public:
  CCmdTarget::CCmdTarget()  {
                            }
  CCmdTarget::~CCmdTarget() {
                            }
};

IMPLEMENT_DYNAMIC(CCmdTarget, CObject)

 

执行：cl /P test.cpp
生成: test.i
test.i文件内容就是所想要的

注意：#define定义一定要放在struct前面，否则可能不会产生预想的结果