How to set a bitmap as a dialog background ?

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How to set a bitmap as a dialog background ? Thanx.

Joaquin M Lopez Munoz

It goes along this:

Class CYourDlg: public CDialog{
...
CBitmap m_bitmap_background;
BITMAP m_bmInfo_background;
...
};

BOOL CYourDlg::OnInitDialog()
{
...
m_bitmap_background.LoadBitmap(IDB_BACKGROUND);
::GetObject(m_bitmap_background,sizeof(BITMAP),&m_bmInfo_background);
...
return TRUE;
}

BOOL CYourDlg::OnEraseBkgnd(CDC* pDC)
{
CRect rect;
GetClientRect(rect);

CDC dcMem;
dcMem.CreateCompatibleDC(pDC);

HBITMAP\* pBmpOld=(HBITMAP\*)::SelectObject(dcMem.m\_hDC,m\_bitmap\_background);

for(int y=rect.top;y<rect.bottom;y+=m\_bmInfo\_background.bmHeight){
    for(int x=rect.left;x<=rect.right;x+=m\_bmInfo\_background.bmWidth){
        pDC->BitBlt(x,y,m\_bmInfo\_background.bmWidth,m\_bmInfo\_background.bmHeight,
                    &dcMem,0,0,SRCCOPY);
    }
}

::SelectObject(dcMem.m\_hDC, pBmpOld);

return TRUE;

}

This is for a tesellation effect (sort of like background images in HTML). Easy to adapt it to your specific needs. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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