图像灰度的改变 void CDibView::OnZftJh() { 　CClientDC pDC(this) 　HDC hDC=pDC.GetSafeHdc() //获取当前设备上下文的句柄； 　SetStretchBltMode(hDC,COLORONCOLOR) 　CDibDoc *pDoc=GetDocument()-Grayhound change void CDibView : : OnZftJh () (CClientDC pDC (this) HDC pDC.GetSafeHdc hDC = () / / access to the current context handle equipment; SetStretchBltMode (hDC, COLORONCOLOR) CDibDoc * pDoc = Malaysia ()