Autodesk CAD实体集合另存为小工具

Autodesk CAD实体集合另存为小工具

一，使用Autodesk CAD的二次开发技术ObjectARX（依赖与Autodesk CAD）。其中有c++和C#版，这里使用C#版。

二，生成的dll（C#）或arx（c++），必须被拷贝到ACAD的目录下，且在ACAD中使用命令netload或appload加载生成的dll或arx，加载后我们在ACAD中输入我们的命令即可。（下面小程序的命令是SaveDwg）

三，小程序的功能是选取ACAD中打开的dwg图纸上的一些内容，然后保存为另一张dwg图纸。

四，c#的代码如下，比较简单，只考虑了简单的情况。

using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.Windows.Forms;
using  System.Collections;

using  Autodesk.AutoCAD.Runtime;
using  Autodesk.AutoCAD.DatabaseServices;
using  Autodesk.AutoCAD.EditorInput;
using  Autodesk.AutoCAD.ApplicationServices;

namespace  SaveDwg
{
    public class Program
    {   
 
        [CommandMethod("SaveDwg")]   
        
        public void SaveDwg()
        {
            try
            {

                Database db = HostApplicationServices.WorkingDatabase;

                SelectionSet selectionset;
                ArrayList setList = new ArrayList();

                Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
                ed.WriteMessage("welcome to use the tool, it can save as a dwg file for your selected entities.\n");
                PromptSelectionOptions selectionOptions = new PromptSelectionOptions();
                PromptSelectionResult selectionResult;
                selectionResult = ed.GetSelection(selectionOptions);
                if (selectionResult.Status != PromptStatus.OK)
                {
                    ed.WriteMessage("select error, please use command again.\n");
                    return;
                }
                else
                {
                    selectionset = selectionResult.Value;
                    foreach (ObjectId id in selectionset.GetObjectIds())
                    {
                        DBObject ob = id.Open(OpenMode.ForRead);
                        Entity ent = ob as Entity;
                        if (ent != null)
                        {
                            Entity ent2 = ent.Clone() as Entity;
                            setList.Add(ent2);
                            ed.WriteMessage("copying entity is successful.\n");
                        }                        
                        ob.Close();
                    }
                }
                ed.WriteMessage("select and copy successfully.\n");

                Database Db = new Database(true, false);
                HostApplicationServices.WorkingDatabase = Db;
                Autodesk.AutoCAD.DatabaseServices.TransactionManager manager = Db.TransactionManager;
                using (Transaction transaction = manager.StartTransaction())
                {
                    BlockTable table = (BlockTable)manager.GetObject(Db.BlockTableId, OpenMode.ForWrite);
                    BlockTableRecord record = (BlockTableRecord)manager.GetObject(Db.CurrentSpaceId, OpenMode.ForWrite);

                    foreach (Object obj in setList)
                    {
                        Entity ent = obj as Entity;
                        if (ent != null)
                        {
                            record.AppendEntity(ent);
                            //manager.AddNewlyCreatedDBObject(ent,true);
                        }

                    }
                    record.Close();
                    table.Close();
                    transaction.Commit();
                }

                SaveFileDialog dialog = new SaveFileDialog();
                string filePath;
                if (DialogResult.OK == dialog.ShowDialog())
                {
                    filePath = dialog.FileName;
                    Db.SaveAs(filePath, DwgVersion.Current);
                }
                
            }
            catch(System.Exception e)
            {
                MessageBox.Show("copy fail");
            }
        }
    }
}

五，记得要reference ObjectARX程序需要的dll哦，如下图：

六，想要脱离AutodeskCAD处理dwg图纸，需要使用ObjectDBX技术，最新版改名为realdwg技术。