Extension for working with topology.
Product Availability
Supported Platforms
Interfaces
| Interfaces | Description |
|---|---|
| IActiveViewEvents (esriCarto) | Provides access to events that occur when the state of the active view changes. |
| IConnectionPointContainer | Supports connection points for connectable objects. |
| IEditEvents (esriEditor) | Provides access to editor events. Implement it to listen for specific events that occur during an edit session. |
| IEditEvents2 (esriEditor) | Provides access to more editor events. Implement it to listen for specific events that occur during an edit session. |
| IEditEvents3 (esriEditor) | Provides access to more editor events. Implement it to listen for specific events that occur during an edit session. |
| IExtension (esriSystem) | Provides access to members that define an extension. |
| IObjectClassEvents (esriGeoDatabase) | Provides access to events that occur with an object class. |
| IPersistStream (esriSystem) | |
| ITopologyExtension | Provides access to members that control a topology. |
Event Interfaces
| Interfaces | Description |
|---|---|
| ITopologyExtensionEvents (default) | Provides access to events that occur when working with a topology. |
Remarks
The TopologyExtension CoClass is the main component used when working with a topology inside ArcMap. From the TopologyExtension you can access the current MapTopology, work with the set of active topology errors, or listen for topology-related events.
In order to use the TopologyExtension you must be inside an edit session.
To get a reference to the TopologyExtension extension, use IApplication::FindExtensionByCLSID or IApplication::FindExtensionByName.
The following VBA code example shows the former method being used to acquire a reference of type ITopologyExtension to the TopologyExtension object.
Sub GetTopologyExtension()
Dim pTopologyExtension as ITopologyExtension
Dim pUID As New UID
pUID.Value = "esriEditorExt.TopologyExtension"
Set pTopologyExtension = Application.FindExtensionByCLSID(pUID)
End Sub
Working with Events
When working with TopologyExtension's default outbound interface in Visual Basic 6 declare variables as follows: Private WithEvents pTopologyExtension as TopologyExtension
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