Hi Ruud,
Thank you very much for the snippets. Very useful for my next step to
extract vehicle information.
As the first step i would like to get a list of the vehicle ids that
just departed from the simulation (or newly arrived) to manage my
internal list of active vehicles. From your first example it seems the
results cannot be filtered to only the VAR_ARRIVED_VEHICLES_IDS or
VAR_DEPARTED_VEHICLES_IDSInstead all subscribed results are returned in
the sub_results map. The first element of the map is the variable ID,
correct? Then i would expect the second element is a list of vehicle ids:
/ auto sub_results = Vehicle::getSubscriptionResults(name.c_str());
for (auto r : sub_results) {
int var_id = r.first();
/
/ if (var_id == libsumo::VAR_ARRIVED_VEHICLES_IDS) {
/
/ char const* vehicle_ids = r.second()->getString().c_str();/
/ }
/
/ }
/
However, the vehicle_ids string does seems to contain any vehicle ids,
list or ...
Is it possible to get just the list of vehicle ids in the C++ lib (like
in Python), and if so how, or do i need to determine that from the
individual vehicles results like in your second example?
Thanks,
Bart
On 05-12-2023 10:12, Ruud van Gaal wrote:
Hi Bart,
Here are some snippets. For getSubscriptionResults():
/ auto sub_results = Vehicle::getSubscriptionResults(name.c_str());
for (auto r : sub_results) {
pt_LogDbg("- Ego subscr result type 0x%x: '%s'", r.first,
r.second->getString().c_str());
}
/
I'm using a context subscription really (only report within a specific
radius):
/libsumo::SubscriptionResults subscriptionResults;
if (prefLogSumoCalls)
pt_Log("SUMO call: Vehicle::getContextSubscriptionResults(%s)",
name.c_str());
subscriptionResults =
Vehicle::getContextSubscriptionResults(name.c_str());
// Go through results (parse)
std::string entity_id;
for (auto e : subscriptionResults) {
entity_id = e.first;
//pt_LogDbg("- Ego ctx subscr result type '%s'", entity_id.c_str());
auto res = e.second;
for (auto r : res) {
//pt_LogDbg(" - subscr result var 0x%x value '%s''", r.first,
r.second->getString().c_str());
switch (r.first) {
case libsumo::VAR_ANGLE:
vehicle->angle = ParseDouble(r.second->getString());
break;
case libsumo::VAR_POSITION3D:/
/ // Convert string to Vector3-like struct
ParsePosition(r.second->getString(), vehicle->position);
break;
case libsumo::VAR_TYPE:
//pt_LogDbg("VAR_TYPE='%s'", r.second->getString().c_str());
vehicle->type_sumo = r.second->getString();/
/ break;/
/ //////////////// etc
default:
pt_LogWarn("Var 0x%x is not parsed; fix the source", r.first);
break;
}
}
}
/
Hope that helps,
Ruud
On Mon, Dec 4, 2023 at 11:35 PM T Eenachtacht via sumo-user
<[email protected]> wrote:
Dear All,
Does anyone have experience, or can send a link to documentation,
on how to process results from a subscription in C++ using
libtraci? I need to convert the following from Python into C++.
The subscription is for multiple types of variables. (not only
VAR_ARRIVED_VEHICLES_IDS).
In Python the implementation is rather straightforward with the
documentation (e.g. in
https://sumo.dlr.de/docs/TraCI/Interfacing_TraCI_from_Python.html).
results = traci.simulation.getSubscriptionResults()
forvehicle_id inresults[tc.VAR_ARRIVED_VEHICLES_IDS]:
# process vehicle_id
This can be converted to C++ like this:
libsumo::TraCIResultsresults =
libtraci::Simulation::getSubscriptionResults();
//std::map<int, std::shared_ptr<libsumo::TraCIResult> >
libsumo::TraCIResults
for(autoentry : results) {
inti = entry.first;
shared_ptr<libsumo::TraCIResult> result = entry.second;
How can the TraCIResults be filtered for '
libsumo::VAR_ARRIVED_VEHICLES_ID' values, and
how to get the id values from the result?
Thanks for the help,
Bart Netten
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