topic Re: Get Entity by using Entity Handle in .NET Forum

Get Entity by using Entity Handle

vkpunique — Tue, 10 Jan 2023 12:40:07 GMT

I am looking for code to get entity from entity handle. I am write code to highligh blockreferences using it's entity handle. User will enter entity handle manually and It will highligh block reference if match is found.

I am confused how to approach this. Can i get object Id from entityhandle? or Can i get access to entity directly with entity handle?

Currently i am looping through all objects in drawing to find my match. I am looking for more efficient way to solve my problem.

Re: Get Entity by using Entity Handle

_gile — Tue, 10 Jan 2023 13:19:04 GMT

Hi,

You can use the Database.GetObjectId method or, better, the undocumented Database.TryGetObjectId one.

[CommandMethod("TEST")] public static void Test() { var doc = Application.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; var pr = ed.GetString("\nEnter Handle: "); if (pr.Status != PromptStatus.OK) return; if (long.TryParse( pr.StringResult, System.Globalization.NumberStyles.HexNumber, System.Globalization.CultureInfo.CurrentCulture, out long value)) { if (db.TryGetObjectId(new Handle(value), out ObjectId id)) { if (id.ObjectClass.IsDerivedFrom(RXObject.GetClass(typeof(Entity)))) { using (var tr = db.TransactionManager.StartTransaction()) { var entity = (Entity)tr.GetObject(id, OpenMode.ForWrite); entity.Highlight(); tr.Commit(); } } else { ed.WriteMessage("\nNot an entity Handle."); } } else { ed.WriteMessage("\nInvalid Handle."); } } else { ed.WriteMessage("\nNot an hex number"); } }

Re: Get Entity by using Entity Handle

vkpunique — Tue, 10 Jan 2023 14:33:15 GMT

Thanks Gile, That TryGetObjectId function looks like gem, I was wondering about it's compatibility with older version of autocad.

One more question, for highlight object editor.SetImpliedSelection(objectsIdArrary) is simpler or Entity.Highlight?

Currently I am using code below to get object ID, it's from Kean Walmsley blog.

private static ObjectId GetObjectIdFromDataBase(string entityHandle) { try { Document doc = Application.DocumentManager.MdiActiveDocument; Database database = doc.Database; //Convert Hexadecimal string to 64 bit integer long entityHandleLongInt = Convert.ToInt64(entityHandle, 16); //Create Handle from long integer Handle handle = new Handle(entityHandleLongInt); //Get Object Id for Handle ObjectId objectId = database.GetObjectId(false, handle, 0); return objectId; } catch (System.Exception) { return ObjectId.Null; } }

Re: Get Entity by using Entity Handle

_gile — Tue, 10 Jan 2023 15:13:38 GMT

@vkpunique a écrit :

I was wondering about it's compatibility with older version of autocad.

It depends on what you mean with "older versions". If I remember well, it was available before A2013.

@vkpunique a écrit :

One more question, for highlight object editor.SetImpliedSelection(objectsIdArrary) is simpler or Entity.Highlight?

Entity.Highlight only highlights the entity (display effect) and do not 'select' it.

@vkpunique a écrit :

Currently I am using code below to get object ID, it's from Kean Walmsley blog.

Using TryParse and TryGetObject is safer, overall if the handle has been entered by the user.

Re: Get Entity by using Entity Handle

vkpunique — Wed, 11 Jan 2023 06:13:28 GMT

what's difference between highlight and selection? I just thought both are same thing. what's point of highlighting if you're not going to use it for other commands?

Re: Get Entity by using Entity Handle

_gile — Wed, 11 Jan 2023 07:03:20 GMT

@vkpunique a écrit :
what's difference between highlight and selection? I just thought both are same thing. what's point of highlighting if you're not going to use it for other commands?

Highlighting just change the entity appearance. It can be used to visually differentiate certain entities.

Re: Get Entity by using Entity Handle

_gile — Wed, 11 Jan 2023 07:30:44 GMT

See the Entity.Highlight topic from the developper's documentation.