摘要：
CClientDC dc(this);CPen pen(1,2,RGB(0,0,255));if(!m_dcMem.m_hDC){m_dcMem.CreateCompatibleDC(&dc);CRect rect;GetClientRect(rect);CBitmap bitmap;bitmap.CreateCompatibleBitmap(&dc,rect.Width(),rect.Height());m_dcMem.SelectObject(&bitmap);m_dcMem.SelectObject(&pen);m_dcMem.BitBlt(0,0,rec 阅读全文