All,
I've just started poking around with the GeopositionInfo stuff now
that Ubuntu 18.04 has location services. Can't find good C++ examples.
Everyone seems to focus on worthless QML.
First off: Huge serious kudos to Denis Shienkov for
https://codereview.qt-project.org/#/c/229911/
That bug report was better than any of the documentation. Well worth a read.
For purposes of this discussion we will call the application Fred to
protect the guilty.
The application has the following snippet of code.
syslog( LOG_MAKEPRI(LOG_USER, LOG_INFO), "%s", "Trying to create
default GeoPositionInfoSource");
qDebug() << "Trying to create default GeoPositionInfoSource";
m_geoSource = QGeoPositionInfoSource::createDefaultSource(this);
if (m_geoSource)
{
syslog( LOG_MAKEPRI(LOG_USER, LOG_INFO), "%s", "successfully
created default GeopositionInfoSource");
qDebug() << "successfully created default GeopositionInfoSource";
connect(m_geoSource, SIGNAL(positionUpdated(QGeoPositionInfo)),
this, SLOT(positionUpdated(QGeoPositionInfo)));
#ifdef QT_DEBUG
m_geoSource->setUpdateInterval( 1000 * 60 * 2); // 1000ms in a second
#else
m_geoSource->setUpdateInterval( 1000 * 60 * 45); // 1000ms
in a second
#endif
m_geoSource->startUpdates();
}
else
{
syslog( LOG_MAKEPRI(LOG_USER, LOG_ERR), "%s", "Unable to
create default GeopositionInfoSource");
qDebug() << "Unable to create default GeopositionInfoSource";
}
I have enabled location services in Ubuntu 18.04 and am debugging
inside of QtCreator. The .profile for my account contains:
export QT_GEOCLUE_APP_DESKTOP_ID=ipos
and I've added fred to /etc/geoclue/geoclue.conf
[fred]
allowed=true
system=false
users=
When I compiled 5.9.7 from source the following snippet is from the
configuration summary.
Qt Positioning:
Gypsy GPS Daemon ....................... no
WinRT Geolocation API .................. no
Qt Location:
Geoservice plugins:
OpenStreetMap ........................ yes
HERE ................................. yes
Esri ................................. yes
Mapbox ............................... yes
MapboxGL ............................. no
Itemsoverlay ......................... yes
When I step through in the debugger I see the following:
Debugging starts
QML debugging is enabled. Only use this in a safe environment.
Trying to create default GeoPositionInfoSource
successfully created default GeopositionInfoSource
Failed to set Geoclue positioning requirements. Geoclue error:
org.qtproject.QtDBus.Error.InvalidObjectPath
My question here is: Have I skipped something stupid (quite possible
as there are no good examples, the one C++ example reads from a file
to emit a signal so is totally worthless) _or_ does the geoposition
stuff not communicate with Ubuntu 18.04's version of geoclue?
Should I just install
geoclue-examples_0.12.99-4_amd64.deb GeoClue example clients
and roll my own using the dbus interface?
Thanks,
--
Roland Hughes, President
Logikal Solutions
(630) 205-1593
http://www.theminimumyouneedtoknow.com
http://www.infiniteexposure.net
http://www.johnsmith-book.com
http://www.logikalblog.com
http://www.interestingauthors.com/blog
http://lesedi.us
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