Hi Jakob,
ah, obviously itself is in there always, I was too blind to see that, because I always filtered out the ego vehicle in the results. Still
good, if the empty subscription results in a more “forgiving” behavior. Thanks a lot!
Jakob
Von: sumo-user-bounces@xxxxxxxxxxx [mailto:sumo-user-bounces@xxxxxxxxxxx]
Im Auftrag von Jakob Erdmann
Gesendet: Freitag, 5. Januar 2018 10:24
An: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Betreff: Re: [sumo-user] Context Subscription of a Vehicle to Values of Persons (TraCI API C++)
the error was caused when trying to access an empty result (no objects in range). Since a vehicle always has itself in range, the problem never occurred in the first case. It should be fixed in the latest development version 335d5a7.
regards,
Jakob
2018-01-05 9:44 GMT+01:00 Kaths, Jakob <jakob.kaths@xxxxxx>:
Hi,
I retried with today’s nightly snapshot (0_32_0_+0080-45b239f71c) and get the same behavior, except I
can now catch a tcpip::SocketException (somehow didn’t work in my larger code) and avoid the
crash.
Maybe I got you wrong, but retrieving an empty vehicle subscription works fine and without throwing an
exception for me (I used the example you provided with the Python test and with 100m radius, at times there are no vehicles and no persons). When subscribing only to persons though, the exception is thrown as soon as I retrieve the results with
“traci.simulation.getContextSubscriptionResults("ego");” when there is no person around.
So to me it seems that
traci.simulation.subscribeContext(CMD_SUBSCRIBE_VEHICLE_CONTEXT, "ego", startTime, endTime, CMD_GET_VEHICLE_VARIABLE, subscription_radius, egoSubscriptionVarsVeh);
and
traci.simulation.subscribeContext(CMD_SUBSCRIBE_VEHICLE_CONTEXT, "ego", startTime, endTime, CMD_GET_PERSON_VARIABLE,
subscription_radius, egoSubscriptionVarsPed);
have a different behavior when there are no results. I’m not sure if that’s intended, but
it did confuse me since I thought I could just exchange CMD_GET_VEHICLE_VARIABLE by CMD_GET_PERSON_VARIABLE.
If you still need them, I would like to provide the stack traces, but I don’t know how to create them
unfortunately. Would StackWalker be the right tool?
Thanks
Jakob
Von:
sumo-user-bounces@xxxxxxxxxxx [mailto:sumo-user-bounces@xxxxxxxxxxx]
Im Auftrag von Jakob Erdmann
Gesendet: Donnerstag, 4. Januar 2018 16:28
An: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Betreff: Re: [sumo-user] Context Subscription of a Vehicle to Values of Persons (TraCI API C++)
Possibly you are trying to retrieve context subscription results when there aren't any. The client throws Exceptions without any error message in this case (helpful
messages added in the development version). This was the only way I could reproduce an error.
Please see if you get a better error with the development version. Otherwise I need at least the stack traces from your crash (client and server).
regards,
Jakob
2018-01-03 17:30 GMT+01:00 Kaths, Jakob <jakob.kaths@xxxxxx>:
Hey,
thanks a lot for your answer. I checked the Python example and adapted it to my needs and it worked. I
then prepared the minimal example for C++ and while doing that, I think I found the solution. However, I still didn’t fully understand why… Maybe you could give me a little hint, just for understanding. My subscription to both vehicles and persons around a
vehicle works fine now. If I only subscribe to persons though, the program crashes straight after starting it. So, if I comment line 66 it crashes (which is what I did in my not-minimal-example and why I asked for help), if I comment line 67 it works and if
I don’t comment either of those two lines, it works, too.
You can find the cpp-file here:
https://syncandshare.lrz.de/dl/fiWxH8FERhgLwXaDorAyFmW1/SumoConnect.cpp
Thanks for the amazing help here!
Jakob Kaths
Von:
sumo-user-bounces@xxxxxxxxxxx [mailto:sumo-user-bounces@xxxxxxxxxxx]
Im Auftrag von Jakob Erdmann
Gesendet: Mittwoch, 20. Dezember 2017 09:32
An: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Betreff: Re: [sumo-user] Context Subscription of a Vehicle to Values of Persons (TraCI API C++)
subscribing to persons around an object and subscribing to things around a person should be working. (at least it does in our tests since version 0.31.0).
Can send a small scenario where it fails for you?
regards,
Jakob
2017-12-19 17:59 GMT+01:00 Kaths, Jakob <jakob.kaths@xxxxxx>:
Hello!
I was wondering if it’s possible to retrieve values of pedestrians in SUMO by subscription. I know, that
in Context Subscription in the Wiki (http://sumo.dlr.de/wiki/TraCI/Object_Context_Subscription)
pedestrians are not mentioned. However, I found the corresponding value (CMD_GET_PERSON_VARIABLE 0xae) in the TraCIConstants.h and tried to subscribe, but it failed. Is there a possibility to retrieve position, angle, speed etc. from pedestrians via subscription
without modelling them as vehicles? If not, is this planned for the future or could you give a hint of how to implement this?
Thanks in advance!
Jakob
--
Dipl.-Ing.
Jakob Kaths
Technische Universität München
Ingenieurfakultät Bau Geo Umwelt
Lehrstuhl für Verkehrstechnik
jakob.kaths@xxxxxx
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