相容DC

void CMDI_testView::OnDraw(CDC* pDC)

{

 CMDI_testDoc* pDoc = GetDocument();

 ASSERT_VALID(pDoc);

 // TODO: add draw code for native data here

 CDC pMemClientDC;

 CRect m_rcClient;

 //得到客戶區域的填充矩形

 GetClientRect(&m_rcClient); 

 pMemClientDC.CreateCompatibleDC(pDC);

 CBitmap   bmp;  

 bmp.CreateCompatibleBitmap(pDC,m_rcClient.Width(),m_rcClient.Height());  

 pMemClientDC.SelectObject(&bmp);

 int nWidth = m_rcClient.Width();

 int nHeight = m_rcClient.Height();

 CRect rectangle;

 pMemClientDC.FillSolidRect(&m_rcClient,RGB(0,255,255));  

 //分割客戶區域成小矩形，逐個填充

 for(int i = 0;i < nWidth;i++ )

 {

  rectangle.SetRect(i, 0, i+1, nHeight);

  pMemClientDC.FillSolidRect(&rectangle, RGB(ColorR, ColorG, 255-MulDiv(i, 255, nWidth)));

 }

 pDC->BitBlt(0,0,nWidth,nHeight,&pMemClientDC,0,0,SRCCOPY);

 pMemClientDC.DeleteDC();

}