GPSFollowMovement (Function)

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Ayuda / WLanguage / Funciones WLanguage / Funciones estándar / Funciones de geolocalización

Retrieved properties
Notes
Modo de funcionamiento en iPhone/iPad
Required permissions
Android 12 specific case
Browsers allowing the geolocation

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GPSFollowMovement (Function)

Requests to be notified periodically of the device's current location.

Ejemplo

// Enables a procedure to receive the device's location at regular intervals
GPSFollowMovement(MovementProc)

// Procedure
PROCEDURE MovementProc(pos is geoPosition)

Info("Latitude: " + pos.Latitude)  
Info("Longitude: " + pos.Longitude)

Sintaxis

Enabling the notification mechanism (in a mobile) Ocultar los detalles

GPSFollowMovement(<WLanguage procedure> [, <Timeout> [, <Distance>]])

<WLanguage procedure>: Procedure name

Name of WLanguage procedure called at each notification.
This procedure has the following format:
PROCEDURE <Procedure name>(<Location>)
<Location> is a variable of type geoPosition that contains information about the device's location at the time of the notification.

<Timeout>: Optional integer or optional Duration

Minimum timeout (in hundredths of a second) between two notifications. If this parameter is not specified, the minimum timeout will be set to 60 seconds.
Note: This parameter can correspond to:
an integer corresponding to the number of hundredths of a second,
a Duration variable,
the duration in a readable format (e.g., 1 s or 10 ms).

<Distance>: Optional real

Minimum distance (in meters) between two notifications.
If this parameter is not specified, the minimum distance will be set to 5 meters.

Enabling the notification mechanism in browser code Ocultar los detalles

GPSFollowMovement(<WLanguage procedure>)

<WLanguage procedure>: Procedure name

Name of WLanguage procedure called at each notification. This procedure has the following format:
PROCEDURE <Procedure name>(<Location>, <Error>)
where:
<Location> is a variable of type geoPosition that contains information about the device's location at the time of the notification. To determine if a value was assigned to the Speed, Accuracy, Direction or Altitude properties of a geoPosition variable when the location was retrieved, use the SpeedValid, AccuracyValid, DirectionValid and AltitudeValid properties.
<Error> is an Integer constant corresponding to the error code and that can take the following values:
gpsErrorOK No error was detected.
gpsErrorPosition Unable to determine the location (e.g., access provider internal error).
gpsErrorRights The browser has no sufficient rights to use geolocation.
gpsErrorTimeout The location could not be retrieved within the timeout.

Disabling the notification mechanism

GPSFollowMovement()

Observaciones

Retrieved properties

To determine if a value was assigned to the Speed, Accuracy, Direction or Altitude properties of a geoPosition variable when the location was retrieved, use the SpeedValid, AccuracyValid, DirectionValid and AltitudeValid properties.
To reinitialize a geoPosition variable, use VariableReset.
It is recommended to reset the parameters of the location provider with GPSInitParameter before retrieving a location.
The positioning information retrieved corresponds to the device's last known position: it may therefore not correspond to the device's current position if, for example, the device has been moved while the GPS signal was invalid. You can use the MeasurementDate property of the geoPosition variable to determine the date and time at which the position was calculated.
Speed, Accuracy, Direction and Altitude will be specified only if the location provider allows it (otherwise, these properties will take their default value).
The location provider can be configured with GPSInitParameter.

Notes

Geolocation functions can consume a lot of resources on the device (battery, bandwidth, etc.). Therefore, we advise you not de define very small values for the minimum timeout and for the minimum distance between two notifications.
You can enable location tracking in the background without consuming resources via geoTrackingEnable, geoTrackingDisable, geoTrackingStatus and geoTrackingProcedure. For more details, see Location tracking.
When generating the application, you can allow GPSFollowMovement to be called when the application is in the background (option "Allow calling GPSFollowMovement and BeaconDetectPrecise when the application is in the background" in the "Configuration" step of the wizard).. In this case, the geolocation will continue when the application runs in the background or when the device is in standby mode. For more details, see Generating an iOS application.
To stop receiving notifications, call GPSFollowMovement without parameter or call GPSEnd.

Modo de funcionamiento en iPhone/iPad

Cuando se ejecuta por primera vez una función GPS, el sistema solicita permiso de geolocalización al usuario. Si el usuario se niega, todas las funciones GPS utilizadas en el resto de la aplicación fallarán (error fatal).

Para volver a permitir el uso del GPS en esta aplicación, es necesario modificar la configuración del sistema de la aplicación.

Required permissions

This function changes the permissions required by the application.
Permission required: ACCESS_FINE_LOCATION.

Android 11 specific case: This function requires the ACCESS_BACKGROUND_LOCATION permission to access the device's location.
This permission allows using the function when the application is in the background.

If the application needs to use background location:

Manually add the "ACCESS_BACKGROUND_LOCATION" permission in the Android application generation wizard.

Explicitly request background location permission with PermissionRequest. For example:

PermissionRequest(permBackgroundLocation, Callback)
INTERNAL PROCEDURE Callback(p is Permission)
	IF p.Granted THEN
		// Functions that require background location access can be used
	END
END

A window allows users to:

allow access to the device location while the application is in the background,
allow access to the location only while the application is in use,
deny access to the location. The user can also change these permissions at any time in the Android settings.

Remarks:

Follow Google's guidelines for applications that require background location access. For more details, see https://support.google.com/googleplay/android-developer/answer/9799150. If these conditions are not met (especially user information requirements), applications may not be accepted for publication on Google Play.
The background location permission should only be requested if the location permission has been granted. Otherwise, PermissionRequest will fail.
If the option chosen by the user for the background location access request is more restrictive than the option chosen for the location access request, the application will be automatically restarted.
On devices running Android 10 or earlier, if location permission has been granted to the application, the background location permission will be granted without displaying a window.

Android 12 specific case

To execute the procedure called by GPSFollowMovement when the application is in the background, it is necessary to run a persistent thread (ThreadPersistent).

Browsers allowing the geolocation

During the call to a geolocation function, the browser requests a location authorization.Note: As of Chrome 50 (including Android), the function GPSFollowMovement function can only be used on secure sites (via an SSL certificate, for example). If the site is not secured, the function returns a result that cannot be used. During the test in local (localhost), the function operates properly.

Componente: wd300java.dll

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Versión mínima requerida

Versión 15

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Comentarios

GPS Functions

https://forum.pcsoft.fr/fr-FR/pcsoft.br.windev/519-busca-endereco-rota-endereco-das-coordendas-523/read.awp?hl=enderecodascoordenadas

https://forum.pcsoft.fr/fr-FR/pcsoft.br.windev/2875-informatica-exemplo-google-maps-com-json-retornando-distancia/read.awp?lastview

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10 11 2018

Última modificación: 27/03/2025

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