bitmap on background Dialog

[cristian.muller]

Hello,
i spend my last hours trying to make out something out of the online documentation in Codeguru.

I want a simple simple way to put a bitmap in my background on a Dialog window.With what function or what message do i have to deal?

If you have some code please let me know,
thanks!

[ovidiucucu]

Handle WM_ERASEBKGND.
See few examples in THIS THREAD (http://www.codeguru.com/forum/showthread.php?t=258991) and THESE ARTICLES (http://www.codeguru.com/Cpp/W-D/dislog/).

[cristian.muller]

Thanks Ovidiucucu for this good thread,
with a few association with another thread i have made it work:

BOOL CAppDlg::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default
// BITMAP bm;
// m_Bitmap.GetBitmap(&bm);
CBitmap bm; // Creates a CBitmap object.
bm.LoadBitmap(MAKEINTRESOURCE(IDB_FUNDAL));


CDC memDc;
memDc.CreateCompatibleDC(pDC);

CBitmap *pOldBmp;
pOldBmp = memDc.SelectObject(&bm);
pDC->BitBlt(0, 0, ???,???, &memDc, 0, 0, SRCCOPY);
memDc.SelectObject(pOldBmp);

return TRUE;
// return CDialog::OnEraseBkgnd(pDC);
}
with a little problem:
where the ???,??? i must put the dimension of the bitmap and i don't know how to get them from a CBitmap(i guess it's pretty easy),otherwise it works.

Regards,
Cristian Müller

[cristian.muller]

i found it:
CSize sz=bm.GetBitmapDimension();
and the ???,??? should be replaced with sz.cx and sz.cy

[ovidiucucu]

with a little problem:
where the ???,??? i must put the dimension of the bitmap and i don't know how to get them from a CBitmap(i guess it's pretty easy),otherwise it works.

Regards,
Cristian Müller
Quite easy. Call CBitmap::GetBitmap like in the next example.

BITMAP bmp;
bitmap.GetBitmap(&bmp);
const int nWidth = bmp.bmWidth;
const int nHeight = bmp.bmHeight;