Qt Location A-GPS

[Fillinger]

hi all,

I don't know where to post my thread so I try here.

I try to make an app for GPS location.

With ovi map, we can connect to internet (3g or Wi-Fi) to get some A-GPS data to speed up the tracking.

Is there a solution to use that service in my app because it's really slow (about 15 to 20 min to have gps location).

Or is it possible to use the same data as ovi map use to speed up?
Or maybe is there a web service that can give me the data I need?

thanks.

[divanov]

In Qt you can use Qt Mobility Location API to resolve your location. It allows you to choose, which GPS method to use.
http://doc.qt.nokia.com/qtmobility-1...-overview.html

[Fillinger]

hi divanov,

I follow the Qt doc, but the problem is :

if I run the program of the nokia under application menu to check the gps and get postion, the icon on the top of the screen don't blink and get position in 10 min.

But in my app, the icon blink sometimes and never get valid position if I don't use the nokia app before launching my app..

So I can't get GPS position with my app.

here is the code :

source = QGeoPositionInfoSource::createDefaultSource(this);
if (source)
{
connect(source, SIGNAL(positionUpdated(QGeoPositionInfo)),this, SLOT(positionUpdated(QGeoPositionInfo)));
source->setUpdateInterval(5000);
source->startUpdates();
}

Another question : is QGeoPositionInfoSource use some kind of background process because I would try to create a QThread to get all the info and give them to my main app with signal/slot.

Thank you for the reply.

[Fillinger]

Hi,
I have a problem with my location app. I use the example of Qt.

I explain :

if I run the program of the nokia under application menu to check the gps and get postion, the icon on the top of the screen don't blink and get position in 10 min.

But in my app, the icon blink sometimes and never get valid position if I don't use the nokia app before launching my app..

So I can't get GPS position with my app.

here is the code :

source = QGeoPositionInfoSource::createDefaultSource(this);
if (source)
{
connect(source, SIGNAL(positionUpdated(QGeoPositionInfo)),this, SLOT(positionUpdated(QGeoPositionInfo)));
source->setUpdateInterval(5000);
source->startUpdates();
}

Another question : is QGeoPositionInfoSource use some kind of background process because I would try to create a QThread to get all the info and give them to my main app with signal/slot.

Thank you for the reply.

[divanov]

Check this example, it works fine on my N900
http://wiki.forum.nokia.com/index.ph...t_Mobility_API
Also there is no point to create QThread.

[Fillinger]

Hi divanov,

thanks for your reply and the link, everything works now .

last question, QGeoSatelliteInfoSource does the same works as QGeoPositionInfoSource ?
Because I want to display the accuracy in meter and the signal strength.

Thanks again.

[divanov]

last question, QGeoSatelliteInfoSource does the same works as QGeoPositionInfoSource?

You should use both, if you want also satellites' signal strengths.

[Fillinger]

Ok thanks, I will check that.

Have a good day.