无法在 DLL“user32.dll”中找到名为“Getparent”的入口点？

 #region 获取光标当前状态下控件的句柄
        /// <summary>
        /// 获取光标当前状态下控件的句柄
        /// </summary>
        /// <param name="X">当前光标的X的坐标</param>
        /// <param name="Y">当前光标的Y的坐标</param>
        /// <returns></returns>
        public IntPtr MouseNowPosition(int x, int y)
        {
            IntPtr OriginalHandle;//声明保存原始句柄的变量
            OriginalHandle=((IntPtr)WindowFromPoint(x,y));
            CurrentHandle = OriginalHandle;
            while (OriginalHandle != ((IntPtr)0))
            {
                CurrentHandle = OriginalHandle;
                OriginalHandle = Getparent(CurrentHandle);
            }
            return CurrentHandle;

        }

        #endregion