MFC OnPaint某一区域绘制背景色

void CVLifeClientDlg::OnPaint()
{
  if (IsIconic())
  {
    CPaintDC dc(this); // 用于绘制的设备上下文
 
    SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
 
    // 使图标在工作区矩形中居中
    int cxIcon = GetSystemMetrics(SM_CXICON);
    int cyIcon = GetSystemMetrics(SM_CYICON);
    CRect rect;
    GetClientRect(&rect);
    int x = (rect.Width() - cxIcon + 1) / 2;
    int y = (rect.Height() - cyIcon + 1) / 2;
 
    // 绘制图标
    dc.DrawIcon(x, y, m_hIcon);
  }
  else
  {
    CPaintDC dc(this);
    CRect rect;
    m_cCePing.GetWindowRect(&rect);
    ScreenToClient(&rect);
    CRect rc(0,rect.top,1920,1080);
    dc.FillSolidRect(rc,RGB(255,255,255));//*/
    CDialogEx::OnPaint();
  }
}