InvalidateRect() Invalidate() UpdateWindow()

 

总结:

InvalidateRect(rectNew, TRUE);
  //Invalidates the client area within the given
  //rectangle by adding that rectangle to the CWnd update region.

 

  UpdateWindow();
  //Updates the client area by sending a WM_PAINT
  //message if the update region is not empty.

 

  //The UpdateWindow member function sends a WM_PAINT
  //message directly, bypassing the application queue.
  //If the update region is empty, WM_PAINT is not sent.

 

  Invalidate(FALSE);
  // Invalidates the entire client area of CWnd.

 

除了UpdateWindow()可以避开ON_PAINT队列,直接发送消息,其它都是执行完其后的程序再响应ON_PAINT.

InvalidateRect()可以避免大范围的重绘.

 

还可参考:

http://www.cnblogs.com/buffer/archive/2009/03/11/1408347.html