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CFrameWnd* pmain = (CFrameWnd*)AfxGetApp()->m_pActiveWnd;//获得视图类指针
CPacketView *pdc = (CPacketView *)pmain->GetActiveView();
CMDIChildWnd *pwa=CMDIFrameWnd::MDIGetActive(NULL);//找到活动窗口
CPacketView *pv=(CPacketView *)(pwa->GetActiveView());