/*添加背景图片*/
BOOL CTOOLDlg::OnEraseBkgnd(CDC* pDC)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
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;
}

/*设置控件背景透明*/
HBRUSH CTOOLDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
HBRUSH hbr = CDialogEx::OnCtlColor(pDC, pWnd, nCtlColor);

if(nCtlColor == CTLCOLOR_STATIC )
{
pDC->SetBkMode(TRANSPARENT);//设置背景透明
pDC->SetTextColor(RGB(255,255,0));//设置字体为黄色
return (HBRUSH)::GetStockObject(NULL_BRUSH);
}

// TODO: 如果默认的不是所需画笔，则返回另一个画笔
return hbr;
}

实现效果如下图所示：