void CDxfViewDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CDxfViewDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
DDX_Control(pDX, IDC_DRAWINGWINDOW, m_DrawingWindow);
//}}AFX_DATA_MAP
}m_DrawingWindow 为一个绘图类
就是怎么把图加到文档窗口中