HRGN hrgn1 = CreateRectRgn(10, 10, 100, 100);//创建矩形区域
HRGN hrgn2 = CreateEllipticRgn(150, 150, 250, 250);//创建椭圆区域
HRGN hrgn= CreateRectRgn(0, 0, 0, 0);
int n1=::CombineRgn(hrgn, hrgn1, hrgn2, RGN_OR); //将两个区域组合为一个新区域
HDC hdc = ::GetDC(m_hWnd);
int n = SelectClipRgn(hdc, hrgn);//选择剪切区域
HBRUSH hbr = CreateSolidBrush(RGB(0, 0, 255)); //单色的画刷
BOOL b = FillRgn(hdc, hrgn, hbr); //用画刷填充区域
/*
参数1：HDC hdc
参数2：HRGN hrgn 区域
参数3:HBRUSH hbr 画刷
*/
DeleteObject(hbr);
DeleteObject(hrgn);
::ReleaseDC(m_hWnd, hdc);
