AutoCAD二次开发（.Net）之获取LSP变量的值

//https://blog.csdn.net/qq_21489689/article/details/78973787
 [System.Security.SuppressUnmanagedCodeSecurity]
        [DllImport("accore.dll", EntryPoint = "acedPutSym",
            CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        extern static private int acedPutSym(string args, IntPtr result);

        /// <summary>
        /// Set a LISP variable value.
        /// </summary>
        /// <param name="name">The variable name.</param>
        /// <param name="rb">The variable value</param>
        public static void SetLispSym(string name, ResultBuffer rb)
        {
            acedPutSym(name, rb.UnmanagedObject);
        }

        [System.Security.SuppressUnmanagedCodeSecurity]
        [DllImport("accore.dll", EntryPoint = "acedGetSym",
            CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        extern static private int acedGetSym(string args, out IntPtr result);

        /// <summary>
        /// Get a LISP variable value.
        /// </summary>
        /// <param name="name">The variable name.</param>
        /// <returns>The variable value or null if failed.</returns>
        public static ResultBuffer GetLispSym(string name)
        {
            IntPtr ip = IntPtr.Zero;
            int status = acedGetSym(name, out ip);
            if (status == (int)PromptStatus.OK && ip != IntPtr.Zero)
            {
                return ResultBuffer.Create(ip, true);
            }
            return null;
        }
        //当然，要读取这个变量，首先要设置或者加载这个变量
        ResultBuffer rb1114c = GetLispSym("dydj");
        float intRetio=1;
     foreach (TypedValue val in (System.Collections.IEnumerable)rb1114c)
     {
          intRetio = (float)Convert.ToDouble((val.Value.ToString()));//根据你设置的类型进行转换
     }