MFC在自己建的对话框里怎么获取View类指针

对话框类里怎么获取View类指针？我试了
CMainFrame *pMainFrame = (CMaimFrame *)AfxGetApp()->m_pMainWnd;
CTest1View *pView = (CTest1View *)pMainFrame->GetActiveView();
可是出错说不认识CMainFrame，我include了头文件还是不行。奇怪了。恳请高人指点。非常感谢