VC中的GDI+怎么用

o Drawing a line with GDI
采用GDI画线，您需要2个对象：设备场景和画笔。您通过调用CreatePen获取一个句柄。紧接着，您调用SelectObject将画笔选入设备场景。然后调用MoveToEx将画笔位置设为(20,10)，然后调用绘制一条直线到位置(200,100)。注意MoveToEx和LineTo均需要一个hdc作为参数。
HDC hdc;
PAINTSTRUCT ps;
HPEN hPen;
HPEN hPenOld;
hdc = BeginPaint(hWnd, &ps);
hPen = CreatePen(PS_SOLID, 3, RGB(255, 0, 0));
hPenOld = (HPEN)SelectObject(hdc, hPen);
MoveToEx(hdc, 20, 10, NULL);
LineTo(hdc, 200, 100);
SelectObject(hdc, hPenOld);
DeleteObject(hPen);
EndPaint(hWnd, &ps);