vc++里面CView::OnPrepareDC(pDC, pInfo)的用处?!!
void CEX04AView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) { // TODO: Add your specialized code here and/or call the base class pDC-> SetMapMode(MM-HIMETRIC); CView::OnPrepareDC(pDC, pInfo); } CView::OnPrepareDC(pDC, pInfo);我把删除了,也没有出错,为什么? CView::OnPrepareDC(pDC, pInfo);好像是个空函数。。如果不是从CScrollView派生而来那么这个CView::OnPrepareDC(pDC, pInfo);有什么用处?