[Interest] App. is running after an exception is thrown.

[Alexander Syvak]

So the a.exec() enters the event loop. Then the handler showEvent(QEvent*)
is executed. The std::runtime_error is thrown out of the handler to the
point of the previous call.
The exception is caught inside the main() function. The dialog is thus not
shown, but start executing again.


2013/7/26 Constantin Makshin <cmakshin at gmail.com>

> QCoreApplication::quit(), being an "alias" to QCoreApplication::exit(0),
> does nothing outside an event loop which in your case is started afterwards.
> On Jul 26, 2013 10:20 PM, "Alexander Syvak" <alexander.svk at gmail.com>
> wrote:
>
>> Hello,
>>
>> after calling w.show() there's method redefined void event_dlg::showEvent
>> (QShowEvent *). In this method there's an exception thrown. The process
>> does not terminate.
>> Can anyone througly explain why is the job running after calling either
>> close() of the only one and thus the last window (event_dlg w) or quit() of
>> the QApplication a?
>>
>> #include "event_dlg.h"
>>
>> #include <QApplication>
>>
>> #include <QMessageBox>
>>
>> #include <QDebug>
>>
>> int main(int argc, char *argv[])
>>
>> {
>>
>>     QApplication a(argc, argv);
>>
>>     event_dlg w;
>>
>>     try
>>
>>     {
>>
>>         w.set_config_file("./events.xml");
>>
>>         w.show();
>>
>>     }
>>
>>     catch ( std::runtime_error & e )
>>
>>     {
>>
>> //        QMessageBox msgBox;
>>
>> //        msgBox.setText(e.what());
>>
>> //        msgBox.exec();
>>
>> //        qDebug() << w.close();
>>
>>
>>         a.quit();
>>
>>     }
>>
>>         return a.exec();
>>
>> }
>>
>>
>>
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>>
>>
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