对话框背景真正起作用的做法。（有内存泄露，不过可以通过各个控件的CtrlColor方法实现）

来源：互联网发布：eclipse图形界面编程编辑：程序博客网时间：2024/05/14 13:53

HBRUSH CTestBKGroundDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
    if (nCtlColor == CTLCOLOR_DLG)
    {
        HBITMAP hbm = (HBITMAP)LoadImage(AfxGetApp()->m_hInstance, _T("MyBitMap.bmp"),
            IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
        hbr = CreatePatternBrush(hbm);
        DeleteObject(hbm);
        return hbr;
    }
    else
    {
        CRect rect;
        pWnd->GetClientRect(&rect);
        pWnd->ClientToScreen(&rect);
        ScreenToClient(&rect);

        HBRUSH hbr = NULL;
        HBITMAP hbm = (HBITMAP)LoadImage(AfxGetApp()->m_hInstance, _T("MyBitMap.bmp"),
            IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
        CDC dc;
        dc.CreateCompatibleDC(pDC);
        dc.SelectObject(hbm);
        CDC dc2;
        dc2.CreateCompatibleDC(&dc);
        CBitmap bitmap;
        bitmap.CreateCompatibleBitmap(&dc, rect.Width() + 20,rect.Height() +20);
        dc2.SelectObject(bitmap);
        dc2.BitBlt(0,0,rect.Width() + 20,rect.Height() +20,&dc, rect.left,rect.top,SRCCOPY);
        hbr = CreatePatternBrush((HBITMAP)(bitmap.m_hObject));
        pDC->SetBkMode(TRANSPARENT);
        DeleteObject(hbm);
        bitmap.DeleteObject();
        dc2.DeleteDC();
        dc.DeleteDC();;
        return hbr;
    }
}

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