Tạo ảnh nền cho Dialog trong lập trình MFC?

[thienthanit]

Có ai biết hàm nào Set ảnh nền cho Diaolg trong ứng dụng MFC - Dialog Basic không vậy?

[TQN]

Trích trong Howto database của tui:

    /* 118/. How do I draw a bitmap in the background of a dialog ?     * The trick is to override the OnEraseBkgnd handler. Here's one way of doing it: */    CBitmap bitmapBkgnd;    bitmapBkgnd.Attach(LoadBitmap(AfxGetInstanceHandle(), MAKEINTRESOURCE(m_iBitmapId)));     BOOL CTestbed2Dlg::OnEraseBkgnd(CDC* pDC)    {        CRect rect;        GetClientRect(&rect);         CDC dc;        dc.CreateCompatibleDC(pDC);        CBitmap* pOldBitmap = dc.SelectObject(&bitmapBkgnd);         int iBitmapWidth, iBitmapHeight ;        int ixOrg, iyOrg;         BITMAP bm;        bitmapBkgnd.GetObject(sizeof(BITMAP), &bm);        iBitmapWidth = bm.bmWidth;        iBitmapHeight = bm.bmHeight;        // If our bitmap is smaller than the background and tiling is       // supported, tile it. Otherwise watch the efficiency - don't       // spend time setting up loops you won't need.         if (iBitmapWidth >= rect.Width() && iBitmapHeight >= rect.Height())        {            pDC->BitBlt(rect.left, rect.top, rect.Width(), rect.Height(),                        &dc, 0, 0, SRCCOPY);        }        else        {            for (iyOrg = 0; iyOrg < rect.Height(); iyOrg += iBitmapHeight)            {                for (ixOrg = 0; ixOrg < rect.Width(); ixOrg += iBitmapWidth)                {                    pDC->BitBlt(ixOrg, iyOrg, rect.Width(), rect.Height(),                                &dc, 0, 0, SRCCOPY);                }            }        }         dc.SelectObject(pOldBitmap);        return TRUE;    }    /** If you have static text items and want them to have the bitmap as their    * background, see Tip 117.    *     * Note that the WM_ERASEBKGND message won't appear in ClassWizard by default,    * because ClassWizard hides it from you. To create the handler, you'll have to    * learn how to stop this hiding... which is a useful thing to know anyway. If    * you go to the last right-hand tab (Class Info I think) on ClassWizard, at    * the bottom of the tab you'll see a "filter" combo which is set to "Dialog".    * Change this to "Window" and then go back to the Message Map tab. You'll now    * see a lot more messages to choose from. */

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