如何去掉背景位图?
我在OnPaint()中写了如下代码:
CRect rect;
GetClientRect(&rect);
CBitmap bit;
bit.LoadBitmap(IDB_FRONT);
CDC dcMem;
dcMem.CreateCompatibleDC(&dc);
CBitmap *pOldBitmap=dcMem.SelectObject(&bit);
dcMem.SetMapMode(dc.GetMapMode());
dc.StretchBlt(0,0,rect.right,rect.bottom,&dcMem,0,0,800,631,SRCCOPY);
dcMem.SelectObject(pOldBitmap);
现在我不想要背景了,想去掉它,怎么办?