I'm writing an event handler to trap a polyline being modified with the ObjectModified Event. Right now it works but when I grip edit the polyline I sometimes get only one event fired but sometimes I get multiple events fired. It seems like when I get multiple events fired I get one for every grip...or one for each vertex and each segment?
Any suggestions on how I can trap just the last event? I only need the polyline for reading once it is completely updated. Or, I suppose if I could trap a vertex changing somehow then I could do something with that.
Solved! Go to Solution.
What you could do is to handle the modifyed event and add the objectid from the entity to a list. And check if the list has the objectid then don't add it.
Then handle your code your code in the command ended event itterate true the list. And then clear the list..
Hope this helps. This senario can be used when you need transactionhandling in autocad events.
I'm new to autocad custimizatin and I'm trying to capture the object modified event for attribute change. It sounds similiar to what your doing. Is there anyway you could give me a sample of your code to get me started. I'm using vb.net
Here is some code. I tried to strip out all the custom classes and dependencies specific to my usage. What's left I beleive may be helpful to you. I used ideas and code snipits from reading other posts on events. Another specific contributor that is notable is arcticad and his reply on "Document Change Event".
Public Class AppEventsClass
Private mIdCol As List(Of ObjectId) 'a collection of ObjectId's for use in the command ended event handler
Private DocMan As DocumentCollection
Private db As Database
Private doc As Document
Public Sub Initialize() Implements Autodesk.AutoCAD.Runtime.IExtensionApplication.Ini
mIdCol = New List(Of ObjectId)
DocMan = Application.DocumentManager
AddHandler DocMan.DocumentCreated, AddressOf callback_documentCreated
Public Sub Terminate() Implements Autodesk.AutoCAD.Runtime.IExtensionApplication.Ter
RemoveHandler DocMan.DocumentCreated, AddressOf callback_documentCreated
RemoveHandler doc.CommandEnded, AddressOf callback_CommandEnded
RemoveHandler db.ObjectModified, AddressOf callback_ObjectModified
Private Sub initEvents()
For Each doc In DocMan
db = doc.Database
AddHandler doc.CommandEnded, AddressOf callback_CommandEnded
AddHandler db.ObjectModified, AddressOf callback_ObjectModified
Private Sub callback_documentCreated(ByVal sender As Object, ByVal e As DocumentCollectionEventArgs)
Private Sub callback_CommandEnded(ByVal sender As Object, ByVal e As CommandEventArgs)
If mSIdCol.Count > 0 Then
Dim ObjID As ObjectId
For Each ObjID In mIdCol
Dim Struct As New cStructure(ObjID)
Struct = Nothing
Private Sub callback_ObjectModified(ByVal sender As Object, ByVal e As ObjectEventArgs)
If Not mIdCol.Contains(e.DBObject.Id) Then
Thanks for the help. I've gotten as far as getting the objectmodified event to fire, but I'm not sure how to filter for which command was used or how to tell if an attribute has been updated. Do you know of any books or sites that might be helpful on this subject? I got vb.net programming level 1 by Jerry Winters, but there's not much in it on event handlers
thanks again for your help
You can check for an attribute in the ObjectModified even handler. Test e.DBObject.Id.ClassName. If it matches what you're looking for you can add to the collection.
I don't have access to my documentation but there is a Property or method in the CommandArgs for the command name.
If you download the ObjectArx documentation you can find lots of information.
Sorry, Should have been e.DBObject.Id.ObjectClass.Name.
My code reads
If e.DBObject.Id.ObjectClass.Name. = "AcDbPolyline" then
''do some stuff to polylines
I downloaded the ObjectArx 2012 documentation and it has some new stuff in the Managed Class Reference.
Still having trouble with this. I've gotten the object modified event to fire but it fires about 15 times every time an object is modified. Any clue as to why this is happening?
Can you post your code to look at?
The ObjectModified will fire a lot. There are many things that will cause this to fire on the same object. Not to mention that it fires no matter which object is modified. That's why I added the collection to hold the ObjectId of the entity I wanted to trap. Then I handle it once in the command ended event.