Stop requesting data on SimObject?

[o4oren]

I used the RequestDataOnSimObject method to get a continous stream of data on the current flight.
When the flight ends, how do I stop it? I don't see a way to cancel the request... is removing the listeners enough?

simconnect.RequestDataOnSimObject(DATA_REQUESTS.AIRCRAFT_INFO_REQUEST, DEFINITIONS.AircraftInfo, SimConnect.SIMCONNECT_OBJECT_ID_USER, SIMCONNECT_PERIOD.SECOND, SIMCONNECT_DATA_REQUEST_FLAG.DEFAULT, 0u, 0u, 0u);
simconnect.OnRecvSimobjectData += new SimConnect.RecvSimobjectDataEventHandler(simconnect_OnRecvSimobjectData);

 

[MaxPaperno]

The procedure I use to stop/clear/remove a variable request is to first set the update period of the request to "never" and then invoke SimConnect::ClearDataDefinition. In managed/C# it would look something like..

simconnect.RequestDataOnSimObject(DATA_REQUESTS.AIRCRAFT_INFO_REQUEST, DEFINITIONS.AircraftInfo, SimConnect.SIMCONNECT_OBJECT_ID_USER, SIMCONNECT_PERIOD.NEVER, SIMCONNECT_DATA_REQUEST_FLAG.DEFAULT, 0u, 0u, 0u);
simconnect.ClearDataDefinition(DEFINITIONS.AircraftInfo);

Technically I think only the `ClearDataDefinition()` part is required, but it has been proven that SimConnect may sometimes crash (the whole sim) when removing or changing data requests which are currently active.
<https://forums.flightsimulator.com/...dler-and-potential-sdk-replacement/369464/86?>

HTH,
-Max

 

[MaxPaperno]

PS. You may not need to remove the data definition at all... if you're going to request the same SimVar(s) on the next flight, for example, it may be enough to just set the update period to NEVER, then when you want those vars again set the period to your actual desired interval.

See notes at <https://docs.flightsimulator.com/ht...s_And_Data/SimConnect_ClearDataDefinition.htm> and
<https://docs.flightsimulator.com/ht...nd_Data/SimConnect_RequestDataOnSimObject.htm>

 

[o4oren]

Thanks!
I am new to this, and this is 9ne of the least documented apis I ever had to use!

 

[MaxPaperno]

Arguably worse, the docs are sometimes just wrong. Perhaps outdated or maybe they were never correct in the first place. Though I have to say there have been significant improvements in the last year or so. But still, for example one cannot assume that any particular listed Sim Var, Event ID, or System Event will actually work (at all or as described). I've reported some of the more glaring issues/omissions in the past, and some of the reported stuff [1] in general does get fixed, but there's only so much bandwidth one can allocate to bug-chasing their docs... and then there are new issues after every sim/SDK update.

Anyway, not to discourage you, but yea, embrace the "discovery process."

[1] at <devsupport.flightsimulator.com> which is currently down with some license error....