[Interest] App crashes on iOS when geocode or reverseGecode is used

[Tony Rietwyk]

Hi Roman,

Your qGeoService provider is on the stack and discarded at the end of 
your constructor.  The documentation for geocodingManager makes clear 
that the pointer returned is owned by the provider, so I assume the 
pointer becomes invalid.  Try keeping a pointer to the provider as well 
as the coder.

Hope that helps, Tony


On 13/04/2019 4:54 am, Roman Wüger wrote:
>
> Hello Paolo,
>
> Thanks for reply.
>
> I use it so:
>
> In the constructor I connect the signal from the geocoding manager
>
> m_pGeoPositionUpdates = QGeoPositionInfoSource::createDefaultSource(this);
>
> connect(m_pGeoPositionUpdates, 
> &QGeoPositionInfoSource::positionUpdated, this, 
> &MyClass::onPositionUpdated);
>
> QGeoServiceProvider qGeoService("osm");
>
> m_pQGeoCoder = qGeoService.geocodingManager();
>
> m_pGeoPositionUpdates->startUpdates();
>
> In the connected slot I will do this :
>
> void MyClass::onPositionUpdated(const QGeoPositionInfo &positionUpdate) {
>
> // QGeoLocation location;
>
> // location.setCoordinate(positionUpdate.coordinate());
>
> // QGeoAddress address(location.address());
>
> // updateGeoAddress(address);
>
> qDebug() << "Is Coord Valid: " << positionUpdate.coordinate().isValid();
>
> qDebug() << "Coordinate: " << positionUpdate.coordinate();
>
> if (m_pQGeoCoder) {
>
> QGeoCodeReply *pQGeoCode = 
> m_pQGeoCoder->reverseGeocode(positionUpdate.coordinate()); *// CRASH*
>
> if (pQGeoCode) {
>
> connect(pQGeoCode, &QGeoCodeReply::finished, [=]() {
>
> if (pQGeoCode->error() == QGeoCodeReply::NoError) {
>
> const QList<QGeoLocation> qGeoLocs = pQGeoCode->locations();
>
> if (qGeoLocs.size() > 0) {
>
> updateGeoAddress(qGeoLocs.first().address()); // This function handles 
> the received address
>
> }
>
> }
>
> else {
>
> qDebug() << pQGeoCode->errorString();
>
> }
>
> });
>
> }
>
> }
>
> }
>
> Thanks in advance
>
> Regards
>
> Roman
>
> -----Ursprüngliche Nachricht-----
> Von: Interest <interest-bounces at qt-project.org> Im Auftrag von Paolo 
> Angelelli
> Gesendet: Freitag, 12. April 2019 15:37
> An: interest at qt-project.org
> Betreff: Re: [Interest] App crashes on iOS when geocode or 
> reverseGecode is used
>
> Hi, is the reply finished? do you get it from the finished signal of 
> the manager?
>
> Or are you trying to use what the method returns you immediately?
>
> On Thu, 11 Apr 2019 22:42:36 +0200
>
> Roman Wüger <roman.wueger at gmx.at <mailto:roman.wueger at gmx.at>> wrote:
>
> > Hello,
>
> >
>
> > I try to get the city and country from coordinates.
>
> > For this I use the functions geocode/reverseGecode. The pointer is 
> valid but if the function is accessed with valid coordinates from the 
> GeoPositionInfoSource signal,  I get a EXC_BAD_ACCESS
>
> >
>
> > I use “osm” as the geo service provider.
>
> >
>
> > Any hints?
>
> >
>
> > Regards
>
> > Roman
>
> > _______________________________________________
>
> > Interest mailing list
>
> > Interest at qt-project.org <mailto:Interest at qt-project.org>
>
> > https://lists.qt-project.org/listinfo/interest
>
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>
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>
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>
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