程序退出时，将窗口的状态保存在注册表中 程序运行时，从注册表读取窗口位置，工具条等状态信息 这些工作是相当有用的和必要的 -Program exit, it will be the state of the window stored in the registry Program runs, read from the registry window, position, toolbars and other status information These effor