mfc 双缓冲

[huan_88]

void CDlg::OnPaint()
{
CPaintDC dc(this); // device context for painting

CRect rect;
GetClientRect(&rect);
dc.FillSolidRect(&rect, RGB(0x7d,0x9e,0xc0));//背景色

//
m_picVideo2.GetWindowRect(rect);
ScreenToClient(rect);
//
// Initialize DIB for drawing...
hdib=::DrawDibOpen();
m_hdc = dc.GetSafeHdc();

//
CDC MemDC;
CBitmap MemBitmap;
MemDC.CreateCompatibleDC(NULL);
MemBitmap.CreateCompatibleBitmap(&dc,rect.Width(),rect.Height());
CBitmap *pOldBit = MemDC.SelectObject(&MemBitmap);

if(hdib!=NULL)
{
::DrawDibBegin(hdib,MemDC,
rect.Width(), //-1 don't stretch
rect.Height(), //-1 don't stretch
&m_bmpHdr.bmiHeader,
m_iOutWidth, // width of image
m_iOutHeight, // height of image
0
);
}
if (pRgbOutTemp != NULL)
{
::DrawDibDraw(hdib,
MemDC,
rect.left-490, // dest : left pos
rect.top-245, // dest : top pos
-1, // -1 don't zoom x
-1, // -1 don't zoom y
&m_bmpHdr.bmiHeader, // bmp header info
pRgbOutTemp, // 将实时视频转成的rgb
0, // src :left
0, // src :top
m_iOutWidth, // src : width
m_iOutHeight, // src : height
DDF_SAME_DRAW // use prev params....
);
}
//
dc.BitBlt(rect.left,rect.top,rect.Width(),rect.Height(),&MemDC,0,0,SRCCOPY);
dc.SelectObject(pOldBit);
MemBitmap.DeleteObject();
MemDC.DeleteDC();
}

大家帮我看下我的代码有问题吗？

[huan_88]

引用 1 楼 zhao4zhong1 的回复:

仅供参考：

    pDC = pWnd->GetDC();
        pWnd->Invalidate();
        pWnd->UpdateWindow();
        //pDC->Rectangle(&rect);
        //内存绘图
        CBitmap memBitmap;
        CBitmap* pOldBmp = NULL;
        memDC.CreateCompatibleDC(pDC);
            memBitmap.CreateCompatibleBitmap(pDC,rect.right,rect.bottom);
                pOldBmp = memDC.SelectObject(&memBitmap);
                    memDC.BitBlt(rect.left,rect.top,rect.right,rect.bottom,pDC,0,0,SRCCOPY);
                    DrawWave(&memDC);
                    pDC->BitBlt(rect.left,rect.top,rect.right,rect.bottom,&memDC,0,0,SRCCOPY);
                memDC.SelectObject(pOldBmp);
            memBitmap.DeleteObject();
        memDC.DeleteDC();
    pWnd->ReleaseDC(pDC);

这也是在onpaint里写的吗？

[赵4老师]

引用 2 楼 huan_88 的回复:

[quote=引用 1 楼 zhao4zhong1 的回复:] 仅供参考：

    pDC = pWnd->GetDC();
        pWnd->Invalidate();
        pWnd->UpdateWindow();
        //pDC->Rectangle(&rect);
        //内存绘图
        CBitmap memBitmap;
        CBitmap* pOldBmp = NULL;
        memDC.CreateCompatibleDC(pDC);
            memBitmap.CreateCompatibleBitmap(pDC,rect.right,rect.bottom);
                pOldBmp = memDC.SelectObject(&memBitmap);
                    memDC.BitBlt(rect.left,rect.top,rect.right,rect.bottom,pDC,0,0,SRCCOPY);
                    DrawWave(&memDC);
                    pDC->BitBlt(rect.left,rect.top,rect.right,rect.bottom,&memDC,0,0,SRCCOPY);
                memDC.SelectObject(pOldBmp);
            memBitmap.DeleteObject();
        memDC.DeleteDC();
    pWnd->ReleaseDC(pDC);

这也是在onpaint里写的吗？[/quote] 是

[赵4老师]

仅供参考：

    pDC = pWnd->GetDC();
        pWnd->Invalidate();
        pWnd->UpdateWindow();
        //pDC->Rectangle(&rect);
        //内存绘图
        CBitmap memBitmap;
        CBitmap* pOldBmp = NULL;
        memDC.CreateCompatibleDC(pDC);
            memBitmap.CreateCompatibleBitmap(pDC,rect.right,rect.bottom);
                pOldBmp = memDC.SelectObject(&memBitmap);
                    memDC.BitBlt(rect.left,rect.top,rect.right,rect.bottom,pDC,0,0,SRCCOPY);
                    DrawWave(&memDC);
                    pDC->BitBlt(rect.left,rect.top,rect.right,rect.bottom,&memDC,0,0,SRCCOPY);
                memDC.SelectObject(pOldBmp);
            memBitmap.DeleteObject();
        memDC.DeleteDC();
    pWnd->ReleaseDC(pDC);