Topic: Events in AutoCAD

[Augusto]

Hello Everyone,

Hope you're all doing well.

I'm here once again in need of your expertise and guidance. I have a question related to events in AutoCAD.

Is there any event related to the database or object that allows me to identify a selected object, specifically a BlockReference in my case?

For some modification commands, I plan to transfer the selection from the block to the polyline. I've embedded information pertaining to the selection object in the code below.

Code - C#: [Select]

1. public void StoreBlockData(ObjectId blockId, double diameter, string type, ObjectId ownerId)
2. {
3.     using (Transaction tr = blockId.Database.TransactionManager.StartTransaction())
4.     {
5.         DBObject obj = tr.GetObject(blockId, OpenMode.ForWrite);
6.  
7.         DBDictionary extDict;
8.         if (obj.ExtensionDictionary.IsNull)
9.         {
10.             obj.CreateExtensionDictionary();
11.             extDict = (DBDictionary)tr.GetObject(obj.ExtensionDictionary, OpenMode.ForWrite);
12.         }
13.         else
14.         {
15.             extDict = (DBDictionary)tr.GetObject(obj.ExtensionDictionary, OpenMode.ForWrite);
16.         }
17.  
18.         // Store Diameter
19.         Xrecord diameterXRec = new Xrecord { Data = new ResultBuffer(new TypedValue((int)DxfCode.Real, diameter)) };
20.         extDict.SetAt("Diameter", diameterXRec);
21.         tr.AddNewlyCreatedDBObject(diameterXRec, true);
22.  
23.         // Store Type
24.         Xrecord typeXRec = new Xrecord { Data = new ResultBuffer(new TypedValue((int)DxfCode.Text, type)) };
25.         extDict.SetAt("Type", typeXRec);
26.         tr.AddNewlyCreatedDBObject(typeXRec, true);
27.  
28.         // Store Owner
29.         Xrecord ownerXRec = new Xrecord { Data = new ResultBuffer(new TypedValue((int)DxfCode.Text, ownerId.ToString())) };
30.         extDict.SetAt("Owner", ownerXRec);
31.         tr.AddNewlyCreatedDBObject(ownerXRec, true);
32.  
33.         tr.Commit();
34.     }
35. }
36.  
37. // Get XRecord
38.         public Dictionary<string, object> GetBlockData(ObjectId blockId)
39.         {
40.             Dictionary<string, object> blockData = new Dictionary<string, object>();
41.  
42.             using (Transaction tr = blockId.Database.TransactionManager.StartTransaction())
43.             {
44.                 DBObject obj = tr.GetObject(blockId, OpenMode.ForRead);
45.  
46.                 if (obj.ExtensionDictionary.IsNull)
47.                     return blockData;  // return empty dictionary if no data
48.  
49.                 DBDictionary extDict = (DBDictionary)tr.GetObject(obj.ExtensionDictionary, OpenMode.ForRead);
50.  
51.                 // Retrieve the Diameter, Type and Owner XRecords and add them to the dictionary
52.                 foreach (string key in new[] { "Diameter", "Type", "Owner" })
53.                 {
54.                     if (extDict.Contains(key))
55.                     {
56.                         Xrecord xRec = (Xrecord)tr.GetObject(extDict.GetAt(key), OpenMode.ForRead);
57.                         TypedValue value = xRec.Data.AsArray()[0];
58.  
59.                         if (key == "Owner")
60.                         {
61.                             Handle handle = new Handle(Convert.ToInt64((string)value.Value));
62.                             blockData[key] = blockId.Database.GetObjectId(false, handle, 0);
63.                         }
64.                         else
65.                             blockData[key] = value.Value;
66.                     }
67.                 }
68.  
69.                 tr.Commit();
70.             }
71.  
72.             return blockData;
73.         }
74.  
75.  

I'm sure your suggestions and insights will be of great assistance, as they have always been.
Thanks a lot in advance.

Best Regards,
Luís Augusto.

mod:kdub:to [ code=csharp ]

[Augusto]

Dictionary<string, object> blockData = GetBlockData(blockId);
ObjectId owner = (ObjectId)blockData["Owner"];