在autocad中自建面板

最新推荐文章于 2024-02-12 23:55:48 发布

yuandingmao

最新推荐文章于 2024-02-12 23:55:48 发布

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本文链接：https://blog.youkuaiyun.com/yuandingmao/article/details/5563254

本文介绍如何使用AutoCAD API进行层的创建与检索。通过具体代码示例，展示了如何创建新的图层并获取其objectId，以及如何根据图层名称获取已存在的图层objectId。

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        #region 新建层
        /// <summary>
        /// 新建层
        /// </summary>
        /// <param name="layername">层名</param>
        /// <returns>返回层的objectid</returns>
        public Autodesk.AutoCAD.DatabaseServices.ObjectId CreateLayer(string layername)
        {
            Autodesk.AutoCAD.DatabaseServices.ObjectId layerId = new Autodesk.AutoCAD.DatabaseServices.ObjectId();
            Autodesk.AutoCAD.DatabaseServices.Database db = Autodesk.AutoCAD.DatabaseServices.HostApplicationServices.WorkingDatabase;
            //开始一个事务
            Autodesk.AutoCAD.DatabaseServices.Transaction trans = db.TransactionManager.StartTransaction();
            try
            {
                //首先取得层表
                Autodesk.AutoCAD.DatabaseServices.LayerTable lt = (Autodesk.AutoCAD.DatabaseServices.LayerTable)trans.GetObject(db.LayerTableId, Autodesk.AutoCAD.DatabaseServices.OpenMode.ForWrite);
                //检查MyLayer层是否存在
                if (lt.Has(layername))
                {
                    layerId = lt[layername];
                }
                else
                {
                    //如果MyLayer层不存在，就创建它
                    Autodesk.AutoCAD.DatabaseServices.LayerTableRecord ltr = new Autodesk.AutoCAD.DatabaseServices.LayerTableRecord();
                    ltr.Name = layername; //设置层的名字
                    layerId = lt.Add(ltr);
                    trans.AddNewlyCreatedDBObject(ltr, true);
                }
                //提交事务
                trans.Commit();
            }
            catch (Autodesk.AutoCAD.Runtime.Exception e)
            {
                //放弃事务
                trans.Abort();
            }
            finally
            {
                // 显式地释放
                trans.Dispose();
            }
            return layerId;
        }
        #endregion

        #region
        /// <summary>
        /// 根据层名字，获取当前的层的objectid
        /// </summary>
        /// <param name="lName">层名字</param>
        /// <returns>获取层的objectid</returns>
        public Autodesk.AutoCAD.DatabaseServices.ObjectId GetBlockTableRecordObjectId(string lName)
        {
            Autodesk.AutoCAD.DatabaseServices.ObjectId layerId = new Autodesk.AutoCAD.DatabaseServices.ObjectId();
            Autodesk.AutoCAD.DatabaseServices.Database db = Autodesk.AutoCAD.DatabaseServices.HostApplicationServices.WorkingDatabase;

            Autodesk.AutoCAD.DatabaseServices.Transaction trans = db.TransactionManager.StartTransaction();
            try
            {
                Autodesk.AutoCAD.DatabaseServices.LayerTable lt = (Autodesk.AutoCAD.DatabaseServices.LayerTable)trans.GetObject(db.LayerTableId, Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead);
                //检查MyLayer层是否存在
                if (lt.Has(lName))
                {
                    layerId = lt.ObjectId;
                }

                trans.Commit();
            }
            catch (Autodesk.AutoCAD.Runtime.Exception e)
            {
                //放弃事务
                trans.Abort();
            }
            finally
            {
                trans.Dispose();
            }
            return layerId;
        }
        #endregion