为什么gdiplus DrawImage可以看到效果，而DrawRectangle看不到效果

ranjio_z 2016-01-08 02:14:32

如题，我自定义了一个CRgnButton，在DrawItem方法中调用gdiplus画上了按钮的一张图片，现在想给按钮加个选中的边框。但是，Graphics的DrawImage方法起作用了，能看到图片的效果，但是Graphicse的Rectangle方法为什么画不出矩形框？
代码如下：



	if (pImg != NULL){

		Graphics g(lpDrawItemStruct->hDC);

		g.SetClip(trgn, CombineModeReplace);

		g.DrawImage(pImg, RectF((REAL)0, (REAL)0, (REAL)pImg->GetWidth(), (REAL)pImg->GetHeight()));

		if (m_noDownAnimation == false){

			g.DrawImage(pImg, RectF((REAL)m_imgOffset.X, (REAL)m_imgOffset.Y, (REAL)pImg->GetWidth(), (REAL)pImg->GetHeight()));

		}

		g.Flush();

		SolidBrush brush(RGB(255, 255, 255));

		Pen p(RGB(255, 255, 255));

		p.SetWidth(2);

		p.SetDashStyle(DashStyleDot);

		g.DrawRectangle(&p, RectF((REAL)10, (REAL)10, (REAL)(pImg->GetWidth()-10), (REAL)(pImg->GetHeight()-10)));

		g.Flush();

		g.ReleaseHDC(lpDrawItemStruct->hDC);

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worldy 2016-01-09

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if (pImg != NULL)
{
    Graphics g(lpDrawItemStruct->hDC);
    g.SetClip(trgn, CombineModeReplace); 
    g.DrawImage(pImg, RectF((REAL)0, (REAL)0, (REAL)pImg->GetWidth(), (REAL)pImg->GetHeight()));
    if (m_noDownAnimation == false){
        g.DrawImage(pImg, RectF((REAL)m_imgOffset.X, (REAL)m_imgOffset.Y, (REAL)pImg->GetWidth(), (REAL)pImg->GetHeight()));
    }
//    g.Flush();
    SolidBrush brush(RGB(255, 255, 255));
    Pen p(RGB(255, 255, 255));
    p.SetWidth(2);
    p.SetDashStyle(DashStyleDot);
    g.DrawRectangle(&p, RectF((REAL)10, (REAL)10, (REAL)(pImg->GetWidth()-10), (REAL)(pImg->GetHeight()-10)));
//  g.Flush();
//    g.ReleaseHDC(lpDrawItemStruct->hDC);