[SailfishDevel] How to handle app settings?

[Bob Jelica]

That’s just a warning, I have it as well, but never had problems nor time to investigate further.

//bob

On 29 Dec 2013, at 21:48, Franck Routier (perso) <alci at mecadu.org> wrote:

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> Hi,
> 
> I am trying to use the QSettings wrapper, as proposed by Bob Jelica.
> Here is what I did in my main cpp:
> 
> #include <sailfishapp.h>
> #include "settings.h"
> 
> int main(int argc, char *argv[])
> {
>    // SailfishApp::main() will display "qml/template.qml", if you
> need more
>    // control over initialization, you can use:
>    //
>    //   - SailfishApp::application(int, char *[]) to get the
> QGuiApplication *
>    //   - SailfishApp::createView() to get a new QQuickView * instance
>    //   - SailfishApp::pathTo(QString) to get a QUrl to a resource file
>    //
>    // To display the view, call "show()" (will show fullscreen on
> device).
> 
>    Settings settings;
> 
>    QQuickView *view = SailfishApp::createView();
>    //create the root context and set the context properties
>    QQmlContext *rootContext = view->rootContext();
>    //register our c++ modules for usage in QML
>    rootContext->setContextProperty("settings", &settings);
> 
>    return SailfishApp::main(argc, argv);
> }
> 
> 
> Everything compiles fine, but on deployment, I get these messages:
> 
> [W] QCoreApplication::applicationDirPath:1906 -
> QCoreApplication::applicationDirPath: Please instantiate the
> QApplication object first
> [F] qt_pixmap_thread_test:76 - QPixmap: Must construct a QApplication
> before a QPaintDevice
> 
> applicationPath is used in settings.cpp, but I just copied it as is
> from the download link given.
> 
> I must be missing some obvious step, and would appreciate any help.
> 
> Regards,
> Franck
> 
> 
> Le 29/12/2013 10:15, Bob Jelica a écrit :
>> See my previous mail. I use that in QML all the time.
>> 
>> I guess it’s up to you, as an app developer, to decide what fits
>> your app. In spirit with agile software development, I start of
>> with the easies possible solution, with as little friction as
>> possible and take it from there. The QSettings (with QML wrapper)
>> has served me well, and I could focus my time on other parts of the
>> app instead :)
>> 
>> //bob
>> 
>> On 29 dec 2013, at 10:08, Franck Routier (perso) <alci at mecadu.org>
>> wrote:
>> 
>>> Le 28/12/2013 19:06, Artem Marchenko a écrit :
>>> 
>>>> If you want something QML that works, I use this pure QML
>>>> LocalStorage approach for the last couple of years fine -
>>>> https://github.com/amarchen/Wikipedia/blob/master/src/qml/components/DbDictionary.qml
>>> 
>>> 
>>>> 
> I found inbetween that this is the approach promoted (for now) by Ubuntu
>>> Touch as well.
>>>> 
>>>> Nowadays I would have started with wrapping QSettings though
>>>> (and pull requests to Wikipedia for changing LocalStorage use
>>>> into QSettings wrapper are welcome :))
>>>> 
>>> So as I understand it, QSettings might be better, but is not yet
>>> really usable from QML out of the box (needs a wrapper of some
>>> sort, some being developped by Nokia for example).
>>> 
>>> But, what makes QSettings better thant LocalStorage ? Ans what
>>> makes LocalStorage better than QSettings ?
>>> 
>>> here are my first bets:
>>> 
>>> LocalStorage: (+) available in qml out of the box, more standard
>>> (HTML5 ??), more powerful (sql) (-) not directly human readable /
>>> editable, security concerns (all tables available to all qml apps
>>> ??)
>>> 
>>> QSettings: (+) simple text files (?) (-) not directly usable from
>>> qml
>>> 
>>> there must be some other points...
>>> 
>>> Best regards,
>>> 
>>> Franck _______________________________________________ 
>>> SailfishOS.org Devel mailing list
>> 
>> _______________________________________________ SailfishOS.org
>> Devel mailing list
>> 
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