简单GDI问题：如何使绘制的圆形中间透明？

[Featured]

我晕了
CPen PenRed;
CPen PenBlack;

PenRed.CreatePen(PS_SOLID,3,RGB(255,0,0));
PenBlack.CreatePen(PS_SOLID,3,RGB(0,0,0));

pDC->SetBkMode(TRANSPARENT);

pDC->SelectObject(&PenRed);
pDC->Ellipse (70,122,70+93,122+93);

pDC->SelectObject (&PenBlack);
pDC->Ellipse (107,122,107+93,122+93);

可以看到圆形的内部还是不透明，怎么办？

[Featured]

up

[42252343]

装入一个空笔刷
CBrush *pBrush=CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
CBrush *pOldBrush=pDC->SelectObject(pBrush);

pDC->SetBkMode(TRANSPARENT); 只对文本显示有效

[walkly]

选一个空刷子就可以了

[Featured]

3ks