Purge multiple dwg files in folder

Civil3D
1

Hi everyone,

I was a bit surprised there is no topic on this one. I am currently trying to purge a bunch of drawings (Layers and unused Blockreferences). For this I couldn’t find nodes. First of all: Am I overlooking something? Is the a super easy way I am not aware of? Secondly: with the basics of Paolo
(thanks again for the work) in Run Dynamo Script on entire folder of dwg's - #17 by Paolo_Emilio_Serra1 I managed to get a Python script working. See below and attached.

def python_purge(path):

	adoc = DocumentCollectionExtension.Open(acapp.DocumentManager, path, False)  # Open for Write
	acapp.DocumentManager.CurrentDocument = adoc
	
	if adoc is None:
		return False
	
	ret = True
	err = []

	with adoc.LockDocument():
		with adoc.Database as db:
			with db.TransactionManager.StartTransaction() as t:

				bt = t.GetObject(db.BlockTableId, OpenMode.ForWrite)  # Get BlockTable
					
				oid_coll = ObjectIdCollection()
				for oid in bt:
					oid_coll.Add(oid)
				db.Purge(oid_coll)
				
				for oid in oid_coll:
					acSymTblRec = t.GetObject(oid, OpenMode.ForWrite)  
					
					try:
						acSymTblRec.Erase(True)
					except Exception as e:
						pass
				
				
				lt = t.GetObject(db.LayerTableId, OpenMode.ForWrite)  # Get LayerTable
				
				lid_coll = ObjectIdCollection()
				for lid in lt:
					lid_coll.Add(lid)
				
				db.Purge(lid_coll)
				
				for lid in lid_coll:
					acSymTblRec = t.GetObject(lid, OpenMode.ForWrite)  
					
					try:
						acSymTblRec.Erase(True)
					except Exception as e:
						err.append(e)
						
				t.Commit()
	if adoc:
		DocumentExtension.CloseAndSave(adoc, path)
	if len(err) > 0:
		ret = err	
		
	return ret

PurgeExternalDrawing.dyn (10.1 KB)

2 Likes
2

There are alternative tools for batch purging. I’m guessing this could be a reason why there are no posts on this?
The Batch Save Utility that comes installed with Civil 3D allows for this (it comes with a lisp routine to purge and audit) and there are some free apps such as Drawing Purge. Of course, you may want to use dynamo for this for various reasons too.

3

Thanks a lot for pointing out this tool, I never knew it existed!