COLORREF crl; GetWindowRect(&m_rtWnd); CRgn wndRgn, rgnTemp; CDC* pDC = GetWindowDC(); CDC dcCompatible; dcCompatible.CreateCompatibleDC(pDC); CBitmap* pOldBitmap = dcCompatible.SelectObject(&m_bitmap); wndRgn.CreateRectRgn(0,0,m_rtWnd.Width(),m_rtWnd.Height()); for(int x=0; x<m_rtWnd.Width(); x++) { for(int y=0; y<m_rtWnd.Height(); y++) { crl = dcCompatible.GetPixel(x, y); if(crl == TRANSCOLOR) { rgnTemp.CreateRectRgn(x, y, x+1, y+1); wndRgn.CombineRgn(&wndRgn,&rgnTemp, RGN_XOR);//裁减掉透明色区域 rgnTemp.DeleteObject(); } } } //设置最终的窗口范围 SetWindowRgn((HRGN)wndRgn,TRUE); dcCompatible.SelectObject(pOldBitmap); ReleaseDC(pDC); ReleaseDC(&dcCompatible);