MFC画夹。打印预览的图像只有画出来的一部分

MFC画板。打印预览的图像只有画出来的一部分。
如题——打印预览的图像只有画出来的一部分！

C/C++ code

void  CCEasyPaintView::OnPrint(CDC* pDC, CPrintInfo* pInfo){    OnDraw(pDC);}void  CCEasyPaintView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo /* = NULL */){    CView::OnPrepareDC(pDC, pInfo);    //pDC->SetMapMode(MM_LOENGLISH);    pDC->SetMapMode(MM_ANISOTROPIC);    CSize   size   =   CSize(1000,900);     //pDC->Get    CRect rectTemp;    GetClientRect(&rectTemp);    //size.cx = rectTemp.right;    //size.cy = rectTemp.bottom;    pDC->SetWindowExt(GetDocument()->m_sizeDoc);    //得到实际设备每逻辑英寸的像素数量    int   xLogPixPerInch   =   pDC->GetDeviceCaps(LOGPIXELSX);       int   yLogPixPerInch   =   pDC->GetDeviceCaps(LOGPIXELSY);    //得到设备坐标和逻辑坐标的比例       long   xExt   =   (long)GetDocument()->m_sizeDoc.cx   *   xLogPixPerInch/96  ;       long   yExt   =   (long)GetDocument()->m_sizeDoc.cy   *   yLogPixPerInch/96  ;     pDC->SetViewportExt((int)xExt,   (int)yExt);}void CCEasyPaintView::OnInitialUpdate(){    SetScrollSizes(MM_TEXT, GetDocument()->GetDocSize());    CScrollView::OnInitialUpdate();}