A singleton object representing Engine Network Analyst environment.
Product Availability
Description
The EngineNetworkAnalystEnvironment object is a singleton object (only one instance of the EngineNetworkAnalystEnvironment object is supported per thread) that manages the INetworkLayer objects and the NAWindow.
The EngineNetworkAnalystEnvironment object implements the IEngineNetworkAnalystEnvironment, IEngineNetworkAnalystEnvironmentEvents, and IEngineNetworkAnalystHelper interfaces. The members of these interfaces manage the collection of network layers, the current network layer, solving and getting directions.
Extended Error Information
Use the ISupportErrorInfo method InterfaceSupportsErrorInfo to determine if the object supports extended error information. If the object supports extended error info, VC++ developers should use the OLE/COM IErrorInfo interface to access the ErrorInfo object. Visual Basic developers should use the global error object Err to retrieve this extended error information.
Interfaces
| Interfaces | Description |
|---|---|
| IConnectionPointContainer | Supports connection points for connectable objects. |
| IEngineNetworkAnalystEnvironment | Provides access to the network analyst extension. |
| IEngineNetworkAnalystHelper | Provides access to actions that operate on the network analyst extension. |
| IEngineNetworkAnalystHelper2 | Provides access to actions that operate on the network analyst extension. |
| IExtension (esriSystem) | Provides access to members that define an extension. |
| ISupportErrorInfo | Indicates whether a specific interface can return Automation error objects. |
| IToolSelectedLayer (esriSystemUI) | Provides access to members that set and get the current selected layer, which selection commands and tools works on. |
Event Interfaces
| Interfaces | Description |
|---|---|
| IEngineNetworkAnalystEnvironmentEvents (default) | Provides access to events triggered by the network analysis extension. |
Working with Events
When working with EngineNetworkAnalystEnvironment's default outbound interface in Visual Basic 6 declare variables as follows: Private WithEvents pEngineNetworkAnalystEnvironment as EngineNetworkAnalystEnvironment