[SailfishDevel] Why does sailfishapplication.cpp contain conditional preprocessor statements for desktop?

[Martin Grimme]

Well, you have to run

app->exec();

at the end of the main function. Otherwise, it just returns and exits
the program. :)


Martin


2013/5/5, Superpelican <superpelican at zoho.com>:
> Well I decided to try it myself and it seems that that desktop support
> is needed to be able to deploy/run your app on the SailfishOS emulator,
> otherwise your app just exits.
>
> I copy and pasted together this new main.cpp:
> <code>
> #include <QApplication>
> #include <QGraphicsObject>
> #include <QDir>
> #include <QDeclarativeView>
> #include <QDeclarativeContext>
> #include <QDeclarativeEngine>
> #include <QDeclarativeComponent>
>
> #ifdef HAS_BOOSTER
> #include <MDeclarativeCache>
> #endif
>
>
>
> Q_DECL_EXPORT int main(int argc, char *argv[])
> {
>      /*
>      QScopedPointer<QApplication> app(Sailfish::createApplication(argc,
> argv));
>      QScopedPointer<QDeclarativeView>
> view(Sailfish::createView("main.qml"));
>
>      Sailfish::showView(view.data());
>      */
>      #ifdef HAS_BOOSTER
>          MDeclarativeCache::qApplication(argc, argv);
>      #else
>          new QApplication(argc, argv);
>      #endif
>
>      QDeclarativeView *appview;
>      #ifdef HAS_BOOSTER
>          appview = MDeclarativeCache::qDeclarativeView();
>      #else
>          appview = new QDeclarativeView;
>      #endif
>      QString file = "main.qml";
>      QString path = QString(DEPLOYMENT_PATH);
>      appview->setSource(QUrl::fromLocalFile(path + file));
> appview->setResizeMode(QDeclarativeView::SizeRootObjectToView);
>      appview->setAttribute(Qt::WA_OpaquePaintEvent);
>      appview->setAttribute(Qt::WA_NoSystemBackground);
> appview->viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
> appview->viewport()->setAttribute(Qt::WA_NoSystemBackground);
>      appview->showFullScreen();
> }
> </code>
> It succesfully compiles and runs, but the Application Output area in the
> Qt Creator/Sailfish IDE gives me this:
> <output>
>
> Display on requested
>
> Qml debugging is enabled. Only use this in a safe environment!
>
> Using the meego graphics system
>
> libEGL warning: DRI2: failed to authenticate
>
> Warning: specifying an object instance for initialPage is sub-optimal -
> prefer to use a Component
>
> Remote application finished with exit code 0.
>
> </output>
>
> While when I run the example application (with sailfishapplication.cpp
> etc.) it gives me this:
> <output>
>
> Display on requested
>
> Qml debugging is enabled. Only use this in a safe environment!
>
> Using the meego graphics system
>
> libEGL warning: DRI2: failed to authenticate
>
> Warning: specifying an object instance for initialPage is sub-optimal -
> prefer to use a Component
>
> loaded the Generic plugin
>
> Loaded the MeeGo sensor plugin
>
> Requested sensor id ' "orientationsensor" ' interface not granted
>
> Requested sensor id ' "orientationsensor" ' interface not granted
>
> hijackWindow() context created for QDeclarativeView(0x6ffd9eb8) 1
>
> QGLWindowSurface: Using plain widget as window surface
> QGLWindowSurface(0x702e8a48)
>
> Successfully resolved MeeGo graphics system:
> /usr/lib/qt4/plugins/graphicssystems/libqmeegographicssystem.so
>
> </output>
>
> And when I exit the application in the emulator:
> <output>
> Remote application finished with exit code 0.
> </output>
>
> So basically the app isn't shown on the screen and just immediately
> exits after being started,
>
> Superpelican
>