topic Re: BlockReference SubEntities in .NET Forum

BlockReference SubEntities

HJohn1 — Wed, 20 Mar 2019 03:56:04 GMT

I need to get the bounding box Min and Max points of a rectangle inside a BlockReference. I have tried to get the sub entities thru the BlockRecord and then go thru the vertices of the rectangle (Polyline). However, since this BlockReference is part of a title block in a drawing template, I would also have to deal with the drawing scale, the title block is in the model space. See attached picture. I just wandering if there is an easier way to achieve this. I will really appreciate any help.

Re: BlockReference SubEntities

_gile — Wed, 20 Mar 2019 06:45:07 GMT

Hi,

After getting the coordinates in the BlockTableRecord, you can transform them using the BlockReference.BlockTransform matrix.

Re: BlockReference SubEntities

HJohn1 — Thu, 21 Mar 2019 12:02:14 GMT

Gile, thank you very much for your help, it has been really appreciated.

Re: BlockReference SubEntities

Anonymous — Fri, 28 Aug 2020 09:10:26 GMT

Hello,
can you post your source code please,
i am trying to get the name of the Reference Block in the Model space but i couldn't achieve that.

Re: BlockReference SubEntities

marcin.sachs — Sun, 30 Aug 2020 10:33:29 GMT

@Anonymous
You can get the block name using this:

[CommandMethod("blockName")] static public void blockName() { Document doc = Application.DocumentManager.MdiActiveDocument; Database db = doc.Database; Editor ed = doc.Editor; PromptEntityOptions options = new PromptEntityOptions("\nSelect block reference"); options.SetRejectMessage("\nSelect only block reference"); options.AddAllowedClass(typeof(BlockReference), false); PromptEntityResult acSSPrompt = ed.GetEntity(options); using (Transaction tx = db.TransactionManager.StartTransaction()) { BlockReference blockRef = tx.GetObject(acSSPrompt.ObjectId, OpenMode.ForRead) as BlockReference; BlockTableRecord block = null; if (blockRef.IsDynamicBlock) { //get the real dynamic block name. block = tx.GetObject(blockRef.DynamicBlockTableRecord, OpenMode.ForRead) as BlockTableRecord; } else { block = tx.GetObject(blockRef.BlockTableRecord, OpenMode.ForRead) as BlockTableRecord; } if (block != null) { ed.WriteMessage("Block name is : " + block.Name + "\n"); } tx.Commit(); } }

Re: BlockReference SubEntities

Anonymous — Mon, 31 Aug 2020 11:56:38 GMT

Thanks for your Suggestion,

I have to select the block reference, to get its name.
I got the list of the used blocks in the active dwg by this code.

[CommandMethod("REV1")] public void EditBlock1() { Document acDoc = Application.DocumentManager.MdiActiveDocument; Editor ed = acDoc.Editor; var acDb = HostApplicationServices.WorkingDatabase; using (var acTrans = acDb.TransactionManager.StartTransaction()) { var acBlockTable = acTrans.GetObject(acDb.BlockTableId, OpenMode.ForRead) as BlockTable; if (acBlockTable == null) return; var acBlockTableRecord = acTrans.GetObject(acBlockTable[BlockTableRecord.ModelSpace], OpenMode.ForRead) as BlockTableRecord; if (acBlockTableRecord == null) return; foreach (ObjectId id in acBlockTableRecord) { string blockName; BlockReference bref = acTrans.GetObject(id, OpenMode.ForRead) as BlockReference; if (bref != null) { if (bref.IsDynamicBlock) { BlockTableRecord br = (BlockTableRecord)acTrans.GetObject(bref.DynamicBlockTableRecord, OpenMode.ForRead); //blockName = br.Name; blockName = "DynamicBlock"; } else { blockName = bref.Name; } //Debug.WriteLine("Found block reference: " + blockName); ed.WriteMessage("\n Found block reference: {0}\n\n", blockName); } } acTrans.Commit(); } }