改变背景颜色：

1、在app的初始化函数中调用：

void SetDialogBkColor( COLORREF clrCtlBk = RGB(192, 192, 192), COLORREF clrCtlText = RGB(0, 0, 0) );

2、在OnCtlColor中：

if(nCtlColor == CTLCOLOR_DLG)
 {
  CBrush *brush;
  brush = new CBrush(RGB(221,221,221));
  return (HBRUSH)(brush->m_hObject);
 }

设置背景位图：

CBitmap m_bmpBackground;

m_bmpBackground.LoadBitmap(IDB_BACKGROUND);

OnPaint()

{

CBkDialog::OnPaint();
  /*
  CPaintDC dc(this);    //对话框的dc
  CDC dcMem;
  dcMem.CreateCompatibleDC(&dc);   //创建与对话框dc兼容的内存dc

  CRect rect;
  GetClientRect(&rect);

  BITMAP bitMap;
  m_bmpBackground.GetBitmap(&bitMap);

  CBitmap *pbmpOld=dcMem.SelectObject(&m_bmpBackground);  //将背景位图选入内存dc中
  dc.StretchBlt(0,0,rect.Width(),rect.Height(),&dcMem,0,0,bitMap.bmWidth,bitMap.bmHeight,SRCCOPY);   //将内存dc中的位图拉伸显示在对话框的dc中
  //dc.BitBlt(0,0,rect.Width(),rect.Height(),&dcMem,0,0,SRCCOPY);

}