INetFlag Interface

The following code can be used to create a flag on a junction element:

  IJunctionFlag junctionFlag = new JunctionFlagClass() as IJunctionFlag;

The following code can be used to create a flag on an edge element:

  IEdgeFlag edgeFlag = new EdgeFlagClass() as IEdgeFlag;

Once either flag object is created, you need to get a reference to the INetFlag interface to specify to which network element the flag belongs. This requires knowing three items about a network element:

1. UserClassID - This is the ID of the feature class which the feature belongs to.

2. UserID - This is the ID of the feature within the feature class.

3. UserSubID - This is the ID of an individual element within a feature.

These three properties can be queried from an element ID (EID) by calling INetElements::QueryIDs.

Using the junction flag as an example we can populate the parameters of the object:

  INetFlag netFlag = junctionFlag as INetFlag;
  netFlag.set_UserClassID = userClassID;
  netFlag.set_UserID = userID;
  netFlag.set_UserSubID = userSubID;

The TraceFlowSolver object needs to know about this flag before it can use it in any tracing functions. Once you have created all your flags for your trace, you can add them to the TraceFlowSolver object by calling PutEdgeOrigins or PutJunctionOrigins on the ITraceFlowSolver interface.

Once the EdgeFlag or JunctionFlag object is created, you need to get a reference to the INetFlag interface to specify to which network element the flag belongs. This requires knowing three items about a network element:

1. UserClassID - This is the ID of the feature class which the feature belongs to.

2. UserID - This is the ID of the feature within the feature class.

3. UserSubID - This is the ID of an individual element within a feature.

These three properties can be queried from an element ID (EID) by calling INetElements::QueryIDs.

The TraceFlowSolver object needs to know about this flag before it can use it in any tracing functions. Once you have created all your flags for your trace, you can add them to the TraceFlowSolver object by calling PutEdgeOrigins or PutJunctionOrigins on the ITraceFlowSolver interface.

The following code can be used to create a flag on a junction element:

  Dim junctionFlag As IJunctionFlag = New JunctionFlag

The following code can be used to create a flag on an edge element:

  Dim edgeFlag As IEdgeFlag = New EdgeFlag

Once either flag object is created, you need to get a reference to the INetFlag interface to specify to which network element the flag belongs. This requires knowing three items about a network element:

1. UserClassID - This is the ID of the feature class which the feature belongs to.

2. UserID - This is the ID of the feature within the feature class.

3. UserSubID - This is the ID of an individual element within a feature.

These three properties can be queried from an element ID (EID) by calling INetElements::QueryIDs.

Using the junction flag as an example we can populate the parameters of the object:

  Dim netFlag As INetFlag = CType(junctionFlag, INetFlag)
  netFlag.UserClassID = userClassID
  netFlag.UserID = userID
  netFlag.UserSubID = userSubID

The TraceFlowSolver object needs to know about this flag before it can use it in any tracing functions. Once you have created all your flags for your trace, you can add them to the TraceFlowSolver object by calling PutEdgeOrigins or PutJunctionOrigins on the ITraceFlowSolver interface.