I had crashes as well...
My code looks similar to yours, and I experienced the crash as well
(in the emulator, I suspected because there is no GPS on it, but...)
I found out that I needed to check for the positionInfoSource being valid:
Relevant snippets here:
StationListProxyModel::StationListProxyModel(QObject *parent) :
QSortFilterProxyModel(parent),
positionInfoSource(QGeoPositionInfoSource::createDefaultSource(this)),
m_here(44.5, 9.0),
m_filterRecentOnly(false)
{
...
if (positionInfoSource) {
qDebug() << "position info source available";
connect(positionInfoSource, SIGNAL(positionUpdated(QGeoPositionInfo)),
SLOT(updatePosition(QGeoPositionInfo)));
positionInfoSource->setUpdateInterval(5000);
} else {
qDebug() << "No position info source available";
}
...
}
On Sun, Dec 29, 2013 at 11:02 AM, <christopher.l...@thurweb.ch> wrote:
> Curiouser and curiouser. Today the app still exits on GPS Startup, but the
> Signal 11 error is not being reported, even though this was repeatedly the
> case last night.
>
> In the meantime I have created a throwaway demo SatInfoSourceDemo
> illustrating the problem. (Basically the standard Sailfish template, +
> satinfosource.h and .cpp)
>
> The app exits as soon as satInfoSource.startUpdates(); is called. (In this
> demo from the Pulley Menu on FirstPage.qml
>
> I am guessing the problem is either in my satinfocource plugin, or more
> likely in the Qt5Positioning Library this is calling. The Harmattan
> equivalent of htis code works on a real N9.
>
> The code of the Throwaway demo is pasted below.
>
> Thanks
>
> Chris
>
>
> yaml
> PkgBR: qt5-qtpositioning-devel
> Requires: qt5-qtpositioning
>
>
> //start satinfosource.h
> #ifndef SATINFOSOURCE_H
> #define SATINFOSOURCE_H
>
> #include <QObject>
>
> #include <QtPositioning/QGeoSatelliteInfoSource>
>
> class SatInfoSource : public QObject
> {
> Q_OBJECT
> Q_PROPERTY(int satsInView READ satsInView NOTIFY
> satellitesInViewChanged)
> Q_PROPERTY(int satsInUse READ satsInUse NOTIFY satellitesInUseChanged)
>
>
> public:
> explicit SatInfoSource(QObject *parent = 0);
> ~SatInfoSource();
>
> Q_INVOKABLE void startUpdates();
> Q_INVOKABLE void stopUpdates();
>
> int satsInView() const;
> int satsInUse() const;
>
> signals:
> void satellitesInViewChanged(const int &satsInView);
> void satellitesInUseChanged(const int &satsInUse);
>
>
> private slots:
> void onSatsInViewUpdated(const QList<QGeoSatelliteInfo> &list);
> void onSatsInUseUpdated(const QList<QGeoSatelliteInfo> &list);
>
> private:
> QGeoSatelliteInfoSource *myGeoSatelliteInfoSource;
> int _satsInUse;
> int _satsInView;
>
> };
>
> #endif // SATINFOSOURCE_H
> //end satinfosource.h
>
> //start satinfosource.cpp
> #include "satinfosource.h"
> #include <QDebug>
>
> SatInfoSource::SatInfoSource(QObject *parent) :
> QObject(parent), _satsInUse(0), _satsInView(0)
> {
> myGeoSatelliteInfoSource =
> QGeoSatelliteInfoSource::createDefaultSource(0);
> connect(myGeoSatelliteInfoSource, SIGNAL(satellitesInViewUpdated(const
> QList<QGeoSatelliteInfo> &)), this, SLOT(onSatsInViewUpdated(const
> QList<QGeoSatelliteInfo> &)));
> connect(myGeoSatelliteInfoSource, SIGNAL(satellitesInUseUpdated(const
> QList<QGeoSatelliteInfo> &)), this, SLOT(onSatsInUseUpdated(const
> QList<QGeoSatelliteInfo> &)));
> }
>
> SatInfoSource::~SatInfoSource()
> {
> }
>
> void SatInfoSource::startUpdates() {
> myGeoSatelliteInfoSource->startUpdates();
> }
>
> void SatInfoSource::stopUpdates() {
> myGeoSatelliteInfoSource->stopUpdates();
> }
>
> int SatInfoSource::satsInView() const
> {
> return _satsInView;
> }
>
> int SatInfoSource::satsInUse() const
> {
> return _satsInUse;
> }
>
> void SatInfoSource::onSatsInViewUpdated(const QList<QGeoSatelliteInfo>
> &list) {
> int newInView = list.count();
> if (newInView != _satsInView) {
> qDebug() << "satInfoSource.cpp: onSatsinViewUpdated: " <<
> QString::number(newInView, 'g', 2);
> _satsInView = newInView;
> emit satellitesInViewChanged(newInView);
> }
>
> }
>
> void SatInfoSource::onSatsInUseUpdated(const QList<QGeoSatelliteInfo> &list)
> {
> int newInUse = list.count();
> if (newInUse != _satsInUse) {
> qDebug() << "satInfoSource.cpp: onSatsinUseUpdated: " <<
> QString::number(newInUse, 'g', 2);
> _satsInUse = newInUse;
> emit satellitesInUseChanged(newInUse);
> }
> }
> //end satinfosource.cpp
>
> //start SatInfoSourceDemo.qml
> import QtQuick 2.0
> import Sailfish.Silica 1.0
> import "pages"
>
> ApplicationWindow
> {
> initialPage: Component { FirstPage { } }
> cover: Qt.resolvedUrl("cover/CoverPage.qml")
> }
> //end SatInfoSourceDemo.qml
>
>
> //start FirstPage.qml
> import QtQuick 2.0
> import Sailfish.Silica 1.0
> import SatInfoSource 1.0 //for info about satellites (in view, in use)
>
> Page {
> id: page
>
> SatInfoSource {
> id: satInfoSource
>
> onSatellitesInUseChanged: {
> console.log("GPSBackEnd: SatellitesInUseChanged! " + satsInUse +
> "; " + thisGPSBackEnd.satsInUse);
> }
> onSatellitesInViewChanged: {
> console.log("GPSBackEnd: SatellitesInViewChanged! " + satsInView
> + "; " + thisGPSBackEnd.satsInView);
> }
> }
>
> SilicaFlickable {
> anchors.fill: parent
> PullDownMenu {
> MenuItem {
> text: "Start SatInfoSource"
> onClicked: {
> console.log("turning GPS on")
> satInfoSource.startUpdates();
> }
> }
> }
> }
> }
> //end FirstPage.qml
>
> //start SatInfoSourceDemo.cpp
> #ifdef QT_QML_DEBUG
> #include <QtQuick>
> #endif
>
> #include <sailfishapp.h>
> #include "satinfosource.h"
>
> int main(int argc, char *argv[])
> {
> qmlRegisterType<SatInfoSource>("SatInfoSource",1,0,"SatInfoSource");
> return SailfishApp::main(argc, argv);
> }
> //end SatInfoSourceDemo.cpp
>
> //start SatInfoSourceDemo.pro
> TARGET = SatInfoSourceDemo
>
> CONFIG += sailfishapp
>
> QT += positioning
>
> SOURCES += src/SatInfoSourceDemo.cpp \
> src/satinfosource.cpp
>
> HEADERS += \
> satinfosource.h
>
> OTHER_FILES += qml/SatInfoSourceDemo.qml \
> qml/cover/CoverPage.qml \
> qml/pages/FirstPage.qml \
> rpm/SatInfoSourceDemo.spec \
> rpm/SatInfoSourceDemo.yaml \
> SatInfoSourceDemo.desktop
> //end SatInfoSourceDemo.pro
>
>
>
>
> Zitat von "Andrey Kozhevnikov" <coderusin...@gmail.com>:
>
>
>> use gdb, bro 8)
>>
>> On 28.12.2013 22:45, christopher.l...@thurweb.ch wrote:
>>>
>>> Hi All
>>>
>>> My application quits unexpectedly during startup, apparently due to
>>> "signal 11".
>>>
>>> This seems to be caused by turning the GPS on, as the error occurs
>>> immediately after the app does that.
>>>
>>> I experience this on the Emulator, so it maybe down to the Emulator not
>>> having a real GPS. (my Jolla phone is currently in transit between Vantaa
>>> and Zurich according to Fedex).
>>>
>>> I will create a throwaway demo with just GPS to prove / disprove if the
>>> error is caused by GPS activate (or just bad timing).
>>>
>>> Googling for Signal 11 has revealed little. I have come across some
>>> references to this error on Android related to memory leaks.
>>>
>>> journalctl output is below:
>>>
>>>
>>> Chris
>>>
>>>
>>> Dec 28 18:22:57 SailfishEmul landed25_QT5[721]: [D] onStatusChanged:59 -
>>> MainPage: turning GPS on ...
>>> Dec 28 18:22:57 SailfishEmul landed25_QT5[721]: [D] onGPS:36 - turning
>>> GPS on
>>> Dec 28 18:22:57 SailfishEmul mapplauncherd[594]: Boosted process
>>> (pid=721) was terminated due to signal 11
>>> Dec 28 18:22:57 SailfishEmul invoker[751]: error: Can't send signal 11 to
>>> application [721]: No such process
>>>
>>> _______________________________________________
>>> SailfishOS.org Devel mailing list
>>
>>
>> _______________________________________________
>> SailfishOS.org Devel mailing list
>>
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