Re: save DC as bitmap to file

I tried your to use your code inside InPaint, but it fails:

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

    CRect (rc);
    GetClientRect(rc);

    //CMemDC pDC(&dc,&rc); // Double Buffering

    CDC MemDC;
    MemDC.CreateCompatibleDC(&dc);
    Bmp.CreateCompatibleBitmap(&dc, rc.Width(), rc.Height());
    CBitmap *pOldBitmap = MemDC.SelectObject(&Bmp);

    COLORREF c;
    if ((m_PixelNumberX>0) && (m_PixelNumberY > 0))
    {
        for (int ix=0; ix < m_PixelNumberX; ix++)
        {
            for (int iy=0; iy < m_PixelNumberY; iy++)
            {
                c=PlotData[ix][iy];
                //pDC->SetPixel(ix,iy,c);
                MemDC.SetPixel(ix,iy,c);
            }
        }
    }

    dc.BitBlt(0,0,rc.Width(),rc.Height(),&MemDC,0,0,SRCCOPY);
    MemDC.SelectObject(pOldBitmap);
}

The function is processed first completely then only up to
Bmp.CreateCompatibleBitmap(&dc, rc.Width(), rc.Height());
starts then again at the beginning and stops then at
CBitmap *pOldBitmap = MemDC.SelectObject(&Bmp);

inside
BOOL CGdiObject::Attach(HGDIOBJ hObject)
{
    ASSERT(m_hObject == NULL); // only attach once, detach on
destroy

so, I do not know what is going wrong at this point.

Secondly, could you be so kind to explain where in this code the
bitmap is saved to Bmp ? I can only see information being passed to
MemDC.

Matthias