[StructLayout(LayoutKind.Sequential)]
        public struct APPBARDATA
        {
            ///   <summary>
            ///   The size of the structure, in bytes.
            ///   </summary>
            public int cbSize;
            ///   <summary>
            ///   The handle to the appbar window.
            ///   </summary>
            public IntPtr hWnd;
            ///    <summary>
            ///   An application-defined message identifier. 
            ///   The application uses the specified identifier for notification messages 
            ///   that it sends to the appbar identified by the hWnd member. 
            ///   This member is used when sending the ABM_NEW message.
            ///   </summary>
            public uint uCallbackMessage;
            ///    <summary>
            ///   A value that specifies an edge of the screen. 
            ///   This member is used when sending the ABM_GETAUTOHIDEBAR, ABM_QUERYPOS, ABM_SETAUTOHIDEBAR, and ABM_SETPOS messages.
            ///   This member can be one of the following values
            ///   ABE_BOTTOM  Bottom edge
            ///   ABE_LEFT    Left edge
            ///   ABE_RIGHT   Right edge
            ///   ABE_TOP     Top edge.
            ///   </summary>
            public uint uEdge;
            ///    <summary>
            ///    A RECT structure to contain the bounding rectangle, in screen coordinates, of an appbar or the Windows taskbar. 
            ///    This member is used when sending the ABM_GETTASKBARPOS, ABM_QUERYPOS, and ABM_SETPOS messages.
            ///    </summary>
            public RECT rc;
            ///    <summary>
            ///    A message-dependent value. This member is used with the ABM_SETAUTOHIDEBAR and ABM_SETSTATE messages.
            ///    </summary>
            public int lParam;
        }

//<summary>
            / / /结构的大小，以字节为单位。
            / / /</摘要>
         
            ///<summary>
            / / / appbar窗口的句柄。
            / / /</摘要>
           
            ///<summary>
            // /一个应用程序定义的消息标识符。
            / / /应用程序使用的通知消息指定的标识符
            / / /它发送hWnd成员确定的appbar。
            / / /此成员是使用时发送的ABM_NEW消息。
            / / /</摘要>
            
            ///<summary>
            / / /一个值，指定在屏幕的边缘。
            / / /此成员ABM_GETAUTOHIDEBAR，ABM_QUERYPOS，ABM_SETAUTOHIDEBAR，和ABM_SETPOS消息发送时使用。
            / / /这个成员可以是下列值之一
            / // ABE_BOTTOM底边
            / / / ABE_LEFT左边缘
            / / / ABE_RIGHT右边缘
            / / / ABE_TOP顶边。
            / / /</摘要>
            
            ///<summary>
            / / /一个RECT结构，包含在屏幕坐标的边界矩形，appbar或Windows任务栏上。
            / / /时，该成员用来发送ABM_GETTASKBARPOS，ABM_QUERYPOS ABM_SETPOS消息。
            / / /</摘要>
            
            ///<summary>
            / / /一个依赖于消息值。这个成员是用ABM_SETAUTOHIDEBAR ABM_SETSTATE消息。
            / / /</摘要>