DataField and GPS

Doing my taxes today and I shouldn't post when I'm distracted! 

I hope it won't be that expensive.

Null is a valid value for this and you need to check for it.

    function compute(info as Activity.Info) as Numeric or Duration or String or Null {
        // See Activity.Info in the documentation for available information.
        if(info.currentLocation!=null) {
        	System.println(info.currentLocation.toDegrees());
        }
        return 0.0;
    }

Do you have the positioning permission set?  From the API Doc for currentLocation-

This member will always provide a null value unless the Positioning Permission is enabled.

I dont know how to get the positioning permission set...

I have found enableLocationEvents

However it is specified that : Request a Location event.

Thanks Jim. I tried (I have VS Code). Now i have another error, However it is not related...

Error occurred during initialization of VM
Could not reserve enough space for 1048576KB object heap

So I will try to fix this new error, but I am on the way. Thanks a lot

Sorry, but I don't understand the logic of your code. Maybe you can enlighten me.

2412314 said:

function compute(info as Activity.Info) as Void {

        // See Activity.Info in the documentation for available information.

       

        if(info has :currentLocation){

            if(info.currentLocation != null)

            {

                var myLocation = info.position.toDegrees();

                mLat = myLocation[0];

                mLon = myLocation[1];                

                if (mLat0 == 180)     // On considère dans ce cas que le GPS n'est toujours pas initialisé

                {

                    mLat0 = mLat;

                    mLon0 = mLon;

                }

 

            } else

            {

               

            }

        }

        System.println(info.timerTime);

        System.println(info.altitude);

        System.println(info.currentSpeed);

        System.println(info.currentLocation);

        System.println(info.currentHeartRate);

        System.println(mLat0);

       

    }

The compute function has the parameter info which is defined as Activity.Info. The next line checks if info.currentLocation exists, and then the next line checks if info.currentLocation isn't null. The effect is that the if-clause is only executed if info.currentLocation isn't null. So far I have understood this.

But in the next line var myLocation = info.position.toDegrees() I don't understand.

1. where does info.position come from? Activity.info has no variable position.
2. why is info.currentLocation checked for availability and not null, if another variable is used in the next line that isn't checked for null?
3. why doesn't the compiler complain that info.position is not defined in Activity.info?

2412314 said:

However it crashes... I think it is due to the fact that info.currentLocation is null

4. if it crashes because info.currentLocation is null, the if-clause was not executed. So it may crash in the else-clause or after that. However, no code is displayed for this section.

You only enabled positioning and not everything, correct?  Things like the background permission has side effects if you're not set up for backgrounding.

Thank you all. It works !!!!

To summarize, for novices like me, to develop a DataField using GPS position (under Visual Studio Code)

   A) Monkey C: Edit Permissions > Select Positioning

   B) In the compute function

    function compute(info as Activity.Info) as Void {

        if(info has :currentLocation){

            if(info.currentLocation != null)

            {

                mLat = info.currentLocation.toDegrees()[0];

                mLon = info.currentLocation.toDegrees()[1];               

            } else

            {

            }

        }

        System.println(info.timerTime);

        System.println(info.altitude);

        System.println(info.currentSpeed);

        System.println(info.currentHeartRate);

        System.println(mLat);

        System.println(mLon);  

    }

   C) In Connect IQ device Simulator

Simulation > FIT data >  Playback File or Simulate Data

Then info.currentLocation <> null and it is possible to get the Latitude and Longitude.