TraceFlowsolver.FindFlowElements Fails

EdwardBlair — Thu, 02 Oct 2014 20:23:32 GMT

Hello -

Have got a program that tries to perform a "Find Connected" trace on a network starting on a edge on which an edge flag has been placed and bounded by a set of edge barriers. It consistently fails at this line:

tfs.FindFlowElements(esriFlowMethod.esriFMConnected, edgeElements, out junctionEIDs, out edgeEIDs);

With this error message:

+ $exception {"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."} System.Exception {System.AccessViolationException}

where tfs is a ITraceFlowSolverGEN

Barriers are set on edges where an intersection is found between a selected polygon graphic and a line feature and the origin flag is set on the longest line feature found inside the polygon. The method where the trace is attempted is "ExecuteTrace." The full C# class is attached.

I should also say that on occasion the trace has not failed, however its returned results that are the inverse of what I expected -- that is, everything OUTSIDE the polygon is traced when I thought everything INSIDE the polygon would be.

Thanks in advance for any suggestions,

Re: TraceFlowsolver.FindFlowElements Fails

EdwardBlair — Thu, 16 Oct 2014 17:04:20 GMT

Found the problem. I was not getting the value for UserSubID correctly when setting barriers and flags. When corrected the routine now works fine.

topic TraceFlowsolver.FindFlowElements Fails in ArcObjects SDK Questions

TraceFlowsolver.FindFlowElements Fails

Re: TraceFlowsolver.FindFlowElements Fails