int CTestDialog::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CDialog::OnCreate(lpCreateStruct) == -1)
      return -1;
    HRGN hRgn;
    RECT rect;
    ::GetWindowRect(hwnd, &rect);
    hRgn = CreateRoundRectRgn(0, 0, rect.right - rect.left + 1, rect.bottom - rect.top + 1, 5,5);
    ::SetWindowRgn(hwnd, hRgn, TRUE);
}

Void CTestDialog::OnNcPaint()
{
  CWindowDC dc(this);
  CRect rcWindow;
  CRect rcClient;
  this->GetClientRect(rcClient);
  this->ClientToScreen(rcClient);
  this->GetWindowRect(rcWindow);
  CPoint point = rcWindow.TopLeft();
  rcClient.OffsetRect(-point);
  rcWindow.OffsetRect(-point);
  int windowWidth = rcWindow.Width();
  int windowHeight = rcWindow.Height();
  HDC hMemDC = ::CreateCompatibleDC(dc.m_hDC);
  HBITMAP hBmp = ::CreateCompatibleBitmap(dc.m_hDC, windowWidth, windowHeight);
  ::SelectObject(hMemDC, hBmp);
  Graphics graphics(hMemDC);
  graphics.Clear(Color(255, 255, 255, 255));
  graphics.SetSmoothingMode(SmoothingModeHighQuality);
  //TODO:使用GDI+的DrawImage函数来贴上圆角图片,或者使用RoundRect函数来为对话框画上圆角线
  #if 0 /*使用DrawImage来绘制圆角图片*/
  ImageAttributes ia;
  ia.SetWrapMode( WrapModeTileFlipXY );
  graphic.DrawImage(pImg_LTFrame,……….);
  #endif
  #if 0 /*使用RoundRect来绘制圆角线*/
  RoundRect(hMemDC, rcWindow.left, rcWindow.top, rcWindow.right,rc.bottom, 5, 5 );
  #endif
  dc.IntersectClipRect(rcWindow);
  dc.ExcludeClipRect(rcClient);
  ::BitBlt(dc.m_hDC, 0, 0, windowWidth, windowHeight, hMemDC, 0, 0, SRCCOPY);
  ::DeleteDC(hMemDC);
  ::DeleteObject(hBmp);
}