Cannot get the ObjectId ....

[roberto52]

I have this issue creating different objects:

in an iteration i have to create some objects and in the same time identify them by their objectId in order to destroy later.

I use :

foreach (DataRow dr in my.Rows)
{

if ( condition ==true)MYDATA.AICreateSimulatedObject(Name, Init, DATA_REQUESTS.MYOBJECT);

if (condition ==false) MYDATA.AIRemoveObject(ObjectId, DATA_REQUESTS.MYOBJECT);
}


This is the issue: when i have 2 or more object to create i cannot retrieve the object ID (i use AssignedObjectId method) :the second object is created before the first ObjectId is recognized ...maybe the iteration is faster than the system response sending me back the ID and the AssignObject isn't triggered.

I solved this breaking the iteration when the first object is created ...wait some time and do the iteration again and again..

THE solution could be to wait in the iteration until the AssignObjectId is really triggered and the Id arrives but i'm not able.
Any hint about?

Thanks
Rob

 

[jimkeir]

Hi,

Take a look at SimConnect_SubscribeToSystemEvent - specifically the ObjectAdded event. Without trying it I'm not sure how you'd tie this notification to a specific event though - check the EventID (and friends) to see if they match.

Cheers,
Jim

 

[roberto52]

Mmmmh ..i tried this:
enum EVENT_ID
{

OBJECT_ADDED,
PAUSE,
};

FSData.SubscribeToSystemEvent(EVENT_ID.OBJECT_ADDED , "ObjectAdded");
FSData.SetSystemEventState(EVENT_ID.OBJECT_ADDED, SIMCONNECT_STATE.ON);
FSData.SubscribeToSystemEvent(EVENT_ID.PAUSE , "Pause");
FSData.SetSystemEventState(EVENT_ID.PAUSE, SIMCONNECT_STATE.ON);

I call a create simobject ..then press the "P" for pause and
In receive event i only get the Pause event ..never the object added.
Something missing?
Thanks.

 

[beatle]

Hi Rob,

What you want to do is use a unique request ID for each call to AICreateSimulatedObject and then hook the OnRecvAssignedObjectId event (this will return a structure that contains the request ID you used in the create call and the object ID that was assigned). Your code needs a way to determine if the object ID for a given item in your list has been received yet (since you need to store the request ID in the item data, you could just use the fact that this field is non-zero, and then reset it to zero once you receive the ObjectID).

something like:

enum RequestIDs
{
   SomeRequestID,
   AnotherRequestID,

   CreateAIObjectRequestIDBase = 0x00010000,
   SomeOtherRequestIDBase = 0x00020000,
}

private int nextIndex = 1;

...

AICreateSimulatedObject(Name, Init, RequestsID.CreateAIObjectRequestIDBase + nextIndex);
nextIndex++;
if (nextIndex > 65535)
    nextIndex = 1;

Also, you need to keep in mind that SimConnect is designed as an async interface, and you have to design your code accordingly (so you start an operation in one place, store the state data somewhere, and handle the completion of the operation somewhere else, using the stored state data - in the above example, the value RequestsID.CreateAIObjectRequestIDBase + nextIndex would be used as the key to store/retrieve the state data, or you could just use nextIndex by itself I suppose, as long as you did the math correctly in the OnRecvAssignedObjectId handler to match :-> ). Its also a serialized interface, which means if you are sitting in a recv handler for one of the SimConnect events, and you make a bunch of SimConnect calls, you won't receive any of the return data until after your current function finishes.

Standard procedural programming methods won't quite work in this environment :->

 

[roberto52]

Its also a serialized interface, which means if you are sitting in a recv handler for one of the SimConnect events, and you make a bunch of SimConnect calls, you won't receive any of the return data until after your current function finishes.

Standard procedural programming methods won't quite work in this environment :->

Thanks for explanation, a very useful lesson!.

Those words explain the reason i cant get the objectId when i throw more than one object but just when i break the iteration.
Thanks again.
Rob

 

[bojote]

Those words explain the reason i cant get the objectId when i throw more than one object but just when i break the iteration.
Thanks again.
Rob

Hi Rob, just a quick question... (so I understand correctly) I do see 'short pauses' when batch inserting via AICreateSimulatedObject, when the iteration ends the sim resumes. the pause period is proportional to the number of objects being inserted, what would be your opinion on this particular matter? why the sim pauses during this iteration?

Thanks,

 

[beatle]

The reason you are seeing the pause is that, while the communication part of SimConnect runs async on a background thread, that just queues the requests to be handled later on the main foreground thread, meaning all your AI objects are getting created on the same (or a very small number of) frame(s). One way to work around this would be instead of sending all your AICreateXxx calls at one time, create a list of the objects you want to create, send an AICreateXxx call for the first one, and in the Receive Object ID callback, send the AICreateXxx for the next item in your list (one per callback) until the list is empty. This way, the creates would be spread over a larger number of frames, and while the framerate will go down some during this period, it shouldn't cause it to halt/pause completely.