Bitmap behind documents

[Dean Michaud]

I want to add a logo bitmap, either tiled or centered, behind my document windows so that when they are minimized it displays the logo. I'm not quite sure how to approach this, any ideas? : Dean 'Karnatos' Michaud

[Joaquin M Lopez Munoz]

This post of mine shows you how. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

[Dean Michaud]

What was the date it was written? For some reason the link doesn't forward me onto the post, but I am guessing it has something to do with my job-place's horrible caching server messing things up yet again. If you could repost it, or point me to the date it was published I might be able to work around this caching server's annoyance. Thank you for the help! : Dean 'Karnatos' Michaud

[Joaquin M Lopez Munoz]

I guess the problem is you're not using DHTML, and the URL changes with this optio on. Anyway, here's the post again. --repost It's simple task, but many steps are required:

1. Create a new CWnd-derived class, say CBackgroundWnd.

2. Add these two members to CBackgroundWnd:

   CBitmap m_bitmap_background;
   BITMAP m_bmInfo_background;

   along with this piece of code in CBackgroundWnd ctor:

   m\_bitmap\_background.LoadBitmap(IDB\_BACKGROUND); // change IDB\_BACKGROUND to whatever your resource-located bitmap is called.
   ::GetObject(m\_bitmap\_background,sizeof(BITMAP),&m\_bmInfo\_background);
   

3. Add a handler for WM_ERASEBKGND in CBackgroundWnd and plug this code (which draws the bitmap in tesellation mode)

   BOOL CBackgroundWnd::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;
   

   }

4. Add a member of type CBackgroundWnd to your CMainFrame class, say m_wndClient.

5. Override CMainFrame::OnCreateClient with this:

   BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
   {
   if(!CMDIFrameWnd::OnCreateClient(lpcs, pContext))return FALSE;
   m_wndClient.SubclassWindow(m_hWndMDIClient);
   return TRUE;
   }

That's it, I think. Good luck. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo --end repost Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

[Joao Vaz]

Joaquín , what does it mean "tesellation mode" ? Could you explain ? Cheers, Joao Vaz A person who is nice to you, but rude to the waiter, is not a nice person - Natalie Portman (Padme/Amidala of Star Wars)

[Joaquin M Lopez Munoz]

Same as "mosaic mode": the bitmap is repeated horizontally and vertically to cover all the area. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

[Joao Vaz]

Okay. Thanks :-) Cheers, Joao Vaz A person who is nice to you, but rude to the waiter, is not a nice person - Natalie Portman (Padme/Amidala of Star Wars)

[Dean Michaud]

Man, beautiful! I'm glad I asked, I was taking a different approach and it was causing undeserved headache! Thanks again Joaquín : Dean 'Karnatos' Michaud