批量输出dwg文件中的文本

　　公司来了一批图纸，里面有一部分内容需要复制到excel中，几百张来图每一张都

手工复制，烦死了。编写一个CAD插件，自动导出文本，简单记录在下面。

想法是：

1.输入命令，选择所有dwg文件

2.挨个处理dwg文件，生成同名的txt文件保存文本

基本思路是用Database.ReadDwgFile 读取dwg文件，因为这样可以不用显示文档，可以提高速度；

        [CommandMethod("GetText")]
        public void GetTextCST()
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "dwg files (*.dwg)|*.dwg|All files (*.*)|*.*";
            ofd.FilterIndex = 1;
            ofd.RestoreDirectory = true;
            ofd.Multiselect = true;

            if(ofd.ShowDialog()== DialogResult.OK)
                foreach (string fn in ofd.FileNames)
                    try
                    {
                        DoDwg2Csv(fn);
                    }
                    catch
                    {
                        File.AppendAllText("D:\\dwg2csv.txt", DateTime.Now.ToString("yyyy-MM-dd hh-mm-ss") + fn + "\n");
                    }
        }

　　

        private void DoDwg2Csv(string fn)
        {
            string csvname = fn + ".csv";
            using (Database db = new Database(false, true))
            {
                db.ReadDwgFile(fn, FileOpenMode.OpenForReadAndAllShare, false, "");
                db.CloseInput(true);

                using (Transaction tr = db.TransactionManager.StartTransaction())
                {
                    // 模型空间
                    BlockTable blkTbl = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                    BlockTableRecord modelSpace = tr.GetObject(
                        blkTbl[BlockTableRecord.ModelSpace], 
                        OpenMode.ForRead)
                        as BlockTableRecord;

                    // 遍历模型空间,提取文字                    
                    List<DBText> txts = new List<DBText>();
                    foreach (ObjectId oid in modelSpace)
                    {
                        DBObject dbobj = tr.GetObject(oid, OpenMode.ForRead);
                        if (dbobj is Entity)
                        {
                            Entity entity = dbobj as Entity;
                            string enttype = entity.GetRXClass().Name;
                            if (enttype == "AcDbText")
                            {
                                DBText acText = entity as DBText;
                                if (acText.Position.X < 587 || acText.Position.Y < 115)//指定范围
                                    continue;                                
                                txts.Add( acText );
                            }
                        }//if (dbobj is Entity)
                    }//foreach (ObjectId oid in modelSpace)

                    txts.Sort((t1, t2) => t1.Position.X >= t2.Position.X ? 1 : -1);

                    for (int i = 0; i < txts.Count;i++)
                        File.AppendAllText(csvname, txts[i].TextString+"\r\n", Encoding.Default);
                }//using
            }//using           
        }