4대 클래스간 참조
#include "MainFrm.h" //메인프레임 헤더파일
#include "ClassDoc.h" //Doc클래스 헤더파일
#include "ClassView.h" //View를 include 할때는 반드시 Doc 헤더파일이 위에잇어야한다
#include "Class.h" //APP Class 의 헤더파일
●View클래스에서
void CClassView::OnMenuView() //뷰클래스
CClassApp *pApp=(CClassApp *)AfxGetApp(); //View -> App
CMainFrame *pMain=(CMainFrame *)AfxGetMainWnd(); //View -> MainFrm
//View -> MainFrm -> Doc
CClassDoc *pDoc=(CClassDoc *)pMain->GetActiveDocument();
CClassDoc *pDoc=(CClassDoc *)GetDocument(); //View -> Doc
●MainFrame클래스에서
CClassView *pView=(CClassView *)GetActiveView(); //MainFrm -> View
CClassDoc *pDoc=(CClassDoc *)GetActiveDocument(); //MainFrm -> Doc
CClassApp *pApp=(CClassApp *)AfxGetApp(); //MainFrm -> App
●Doc클래스에서
CClassApp *pApp=(CClassApp *)AfxGetApp(); //Doc -> App
CMainFrame *pMain=(CMainFrame *)AfxGetMainWnd(); //Doc -> MainFrm
// Doc -> MainFrm -> View
CClassView *pView=(CClassView *)pMain->GetActiveView();
CClassView *pView=(CClassView *)m_viewList.GetHead(); // Doc -> View
●App클래스에서
CMainFrame *pMain=(CMainFrame *)AfxGetMainWnd(); //App -> MainFrm
//App -> MainFrm -> View
CClassView *pView=(CClassView *)pMain->GetActiveView();
//App -> MainFrm -> Doc
CClassDoc *pDoc=(CClassDoc *)pMain->GetActiveDocument();