MFC 添加背景圖片並讓控件背景透明

/*添加背景圖片*/
BOOL CTOOLDlg::OnEraseBkgnd(CDC* pDC)
{
 // TODO: 在此添加消息處理程序代碼和/或調用默認值
 CDialog::OnEraseBkgnd(pDC);
 HBITMAP   m_hBitmap;
 HDC           m_hBkDC;
 m_hBitmap   =   ::LoadBitmap(::GetModuleHandle(NULL),MAKEINTRESOURCE(IDB_BITMAP2));
 m_hBkDC     =   ::CreateCompatibleDC(pDC-> m_hDC);
 if(m_hBitmap   &&   m_hBkDC)
 {
  ::SelectObject(m_hBkDC,m_hBitmap);
  ::StretchBlt(pDC-> m_hDC,0,0,700,610,m_hBkDC,0,0,700,610,SRCCOPY);
  ::DeleteObject(m_hBitmap);
  ::DeleteDC(m_hBkDC);
 }

 return TRUE;
}

/*設置控件背景透明*/
HBRUSH CTOOLDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
 HBRUSH hbr = CDialogEx::OnCtlColor(pDC, pWnd, nCtlColor);
 
 if(nCtlColor == CTLCOLOR_STATIC )
 {
  pDC->SetBkMode(TRANSPARENT);//設置背景透明
  pDC->SetTextColor(RGB(255,255,0));//設置字體為黃色
  return (HBRUSH)::GetStockObject(NULL_BRUSH);
 }

 // TODO:  如果默認的不是所需畫筆，則返回另一個畫筆
 return hbr;
}