Set EventTable

ShaningYu — Tue, 24 Sep 2013 14:48:58 GMT

From http://forums.arcgis.com/threads/14202-Inserting-LR-Event-Features-with-VBA, where the code is in VBA:
Dim pRouteEventSource As IRouteEventSource
Set pRouteEventSource = pFLayer.FeatureClass
I tried to setup an EventTable like that:
            ESRI.ArcGIS.Location.IRouteEventSource pRouteEventSource = fc; // fc - a defined FeatureClass
But I got compile error warning under fc: Can't explicitly convert IFeatureClass to IRouteEventSource.
The, I cast it like that
            ESRI.ArcGIS.Location.IRouteEventSource pRouteEventSource = (ESRI.ArcGIS.Location.IRouteEventSource)fc;
            ITable pTable = pRouteEventSource.EventTable;
The compile error was gone. But then I got runtime error: Unable to cast COM object of type 'System.__ComObject' to interface type 'ESRI.ArcGIS.Location.IRouteEventSource'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{641755F0-B7DE-11D3-9F7C-00C04F6BDF06}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
I hope someone can help me for the possible solution. Thanks.

Re: Set EventTable

ShaningYu — Thu, 26 Sep 2013 13:30:30 GMT

In stead of using IRouteEventSource, I used co-class: RouteEventSource and the compile error was gone.
        public string GetRouteMeasureClass(IWorkspace ws, string fName) {
            IFeatureWorkspace fWs = (IFeatureWorkspace)ws;
            IFeatureClass fClass = fWs.OpenFeatureClass(fName);
            ESRI.ArcGIS.Location.RouteEventSource rteEventSource;
            rteEventSource = (ESRI.ArcGIS.Location.RouteEventSource)fClass;
            ...
        }
But another problem occurs. In VS 2010 Object Browser: RouteEventSource is shown as an interface, which contains IDataset only. Whilst in ESRI literature, it is a co-class. There is something incorrect. I have reported it another thread (http://forums.arcgis.com/threads/93431-Subclass-RouteEventSource). I will close this one.

topic Re: Set EventTable in ArcObjects SDK Questions

Set EventTable

Re: Set EventTable