8 replies to this topic

[steavebba]

Hi all,

What is the proper way to get notified of the current service change without using a timer and pooling the information from the session.nav.getcurrentService() ?

 

 

[mrvica]

I don´t know how to do that in python, a simple shell script does the job too

#!/bin/sh
# service_changed
servicerefold=""
while sleep 1; do
      	servicerefnew=`/usr/bin/wget -O - -q http://127.0.0.1/web/getcurrent | /bin/grep -B 1 "\(<\|</\)e2servicename" | /bin/sed 's/<[^>]*>//g' | /bin/sed 's/^[ \t]*//' | /bin/sed '2d'`
        if [ "$servicerefnew" != "$servicerefold" ]; then
		# echo "service changed"
		/usr/bin/wget -q -O /dev/null "http://127.0.0.1/web/message?text=service%20changed%20!!&type=1&timeout=1"
        fi
        servicerefold="$servicerefnew"
done &

[littlesat]

This is so not done...

use the serviceEventTracker and e.g. use the iPlayableService.evStart from there and then get the current service from Navigation.

 

In InfoBarGenerics there are enough examples...

Edited by littlesat, 24 July 2017 - 14:56.

[steavebba]

@mervica thank you for the answer, but pooling the state with python timer would be faster i think especially from a pluging context.

 

Thank you @littlsat, the serviceEventTracker used in the infobar dose not effectively help me it needs a screen and i want to watch for service change in the background.

 

i am using a timer to look for channel change every 1 second.

 

But i have not figured out how to get the service ID (sSID)..

    def update_service_info(self):
        service = session.nav.getCurrentService()
        info = service and service.info()
        data = info and info.getInfoObject(iServiceInformation.sTransponderData)
        sref = ServiceReference(self.session.nav.getCurrentlyPlayingServiceReference())
        name = sref.getServiceName()
        print sref.toString()

        cur_orbpos = data.get("orbital_position", INVALID_POSITION)
        cur_freq = data.get("frequency", 0)
        service_id = self.getinfo(iServiceInformation.sSID)
        print  cur_orbpos,cur_freq,name, service_id

[steavebba]

        service = session.nav.getCurrentService()
        info = service and service.info()
        data = info and info.getInfoObject(iServiceInformation.sTransponderData)
        name = ServiceReference(self.session.nav.getCurrentlyPlayingServiceReference()).getServiceName()
        service_id = self.session.nav.getCurrentlyPlayingServiceReference().toString().split(':')[3] # geting service id from service reference string
        sat_pos = str(data.get("orbital_position", INVALID_POSITION))
        frequency = str(data.get("frequency", 0) / 1000)
        print  name,sat_pos,frequency, service_id

This is how i get the information now how i can avoid pooling this information continuously and  update it only on service change ?

[littlesat]

Then look further what that tracker is doing

[steavebba]

class   Someclass :
  event_callbacks =[]       


 self.session.nav.event.append(Someclass.service_event) # callback shoud be static method 
 Someclass.event_callbacks.append(self.update_service_info)

    @staticmethod
    def service_event(evt):
        if (evt == iPlayableService.evStart):
            print "channel changed....!", evt
            for func in Someclass.event_callbacks:
                print func
                func()

This is how to get notified when some navigation events occur.

Thank you @littlsat for the eventtracker hint.

 

 

 

[littlesat]

Sorry for not giving a direct answer... and just point to 'something'....

[Cassie912]

This nice and useful info for me. Thanks guys