截图功能实现（二）如何框选区域

zjn15000: 你好，我试了好像没有用欸， [code=cpp] CPen pen; CPen *my_old_pen; Cpdc->BeginPath(); pen.CreatePen(PS_SOLID,2,RGB(0,0,0)); my_old_pen = dc.SelectObject(&pen);PaintDC dc(this); dc.MoveTo(0,0); dc.LineTo(0,100); dc.LineTo(100,100); dc.LineTo(100,0); dc.LineTo(0,0); pdc->EndPath(); CRgn rgn; rgn.CreateFromPath(pdc); pdc->InvertRgn(&rgn); CBrush brush; brush.CreateSolidBrush(RGB(255,0,0));//红色画刷 pdc->FillRgn(&rgn,&brush); [/code]