Dynamic Creation ----------- Imitate from Inside MFC

最新推荐文章于 2024-10-22 20:13:32 发布

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#pascal #class #null #mfc

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本文探讨了RTTI在MFC中的实现机制，重点介绍了CRuntimeClass类及其相关成员函数，如CreateObject()和Load()。通过这些函数，可以实现运行时类型信息管理和对象的动态创建。

Further work base on RTTI:

1. CRuntimeClass

       CObject*     CreateObject() ;
       static CRuntimeClass*   PASCAL Load();

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

       #define IMPLEMENT_DYNACREATE(class_name, base_class_name) /
         CObject* PASACAL class_name:: CreateObject() /
          {return new class_name;} /
          _IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, 0xFFFF, /
           class_name::CreateObject)

3.    CObject*     CRuntimeClass::CreateObject()
       {
             if (m_pfnCreateObject == null)
                 return null;

          return (*m_pfnCreateObject)();
       }

4.   CRuntimeClass*   PASCAL CRuntimeClass::Load()
        {
                char szClassName[64];
                cin << szClassName;

                CRuntimeClass* pClass;
                for (pClass = pFirstClass; pClass != NULL; pClass = pClass->m_pNextClass )
                         if (strcmp(szClassName, pClass->m_lpszClassName) == 0)
                               return pClass;

                   return NULL;
        }

. Apply
            CRuntimeClass* pClassRef;
             CObject* pOb;
             while(1)
            {
                if ( (pClassRef = CRuntimeClass::Load() ) == NULL)
                         break;

                pOb = pClassRef->CreateObject();
                if (pOb != null)
                      pOb->DoSomething();
          }