Autocad XData的读取和设置

 

[CommandMethod("GetXD")] static public void GetXData() {     Document doc =Application.DocumentManager.MdiActiveDocument;     Editor ed = doc.Editor;     PromptEntityOptions peo = new PromptEntityOptions("\n请选择实体：");     PromptEntityResult per =ed.GetEntity(peo);     if (per.Status == PromptStatus.OK)     {         Transaction trans =doc.TransactionManager.StartTransaction();         DBObject obj =trans.GetObject(per.ObjectId,OpenMode.ForRead);         ResultBuffer rb = obj.XData;         if (rb == null)             ed.WriteMessage("\n实体不包括扩展数据");         else         {             int n = 0;             foreach (TypedValue tv in rb)             {                 ed.WriteMessage("\n类型值{0} - 类型: {1}, 值: {2}",n,tv.TypeCode,tv.Value);                 n++;             }             rb.Dispose();         }         trans.Dispose();     }//if }   [CommandMethod("SetXD")] static public void SetXData() {     Document doc = Application.DocumentManager.MdiActiveDocument;     Editor ed = doc.Editor;     PromptEntityOptions peo = new PromptEntityOptions("\n请选择实体：");     PromptEntityResult per = ed.GetEntity(peo);     if (per.Status == PromptStatus.OK)     {         Transaction trans = doc.TransactionManager.StartTransaction();         DBObject obj = trans.GetObject(per.ObjectId, OpenMode.ForWrite);         AddRegAppTableRecord("Test");         ResultBuffer rb = new ResultBuffer();         rb.Add(new TypedValue(1001, "Test"));         rb.Add(new TypedValue(1000, "only ascii under AutoCAD 2006"));         rb.Add(new TypedValue(1000,"max length is 255"));         /*          * 1000 扩展数据中的ASCII串（最长字节）          * 1001 扩展数据的已注册应用程序名（ASCII串，最长字节）。          */         obj.XData = rb;         rb.Dispose();         trans.Commit();         trans.Dispose();     } }   static void AddRegAppTableRecord(string regAppName) {     Document doc = Application.DocumentManager.MdiActiveDocument;     Editor ed = doc.Editor;     Database db = doc.Database;     Transaction trans = doc.TransactionManager.StartTransaction();     RegAppTable rat = (RegAppTable)trans.GetObject(db.RegAppTableId, OpenMode.ForRead, false);     if (!rat.Has(regAppName))     {         rat.UpgradeOpen();         RegAppTableRecord ratr = new RegAppTableRecord();         ratr.Name = regAppName;         rat.Add(ratr);         trans.AddNewlyCreatedDBObject(ratr, true);     }     trans.Commit();     trans.Dispose(); }