QMessageBox ( Core Dumped )

[cristiano]

Staff, the QMessageBox below functions normal. More when I pressed the Esc keyboard key, occurs Core dumped in the App.

% Segmentation fault (core dumped)

QMessageBox mb("App", "Hello Message ",
QMessageBox::NoIcon,
QMessageBox::Yes | QMessageBox::Default,
QMessageBox::Cancel, QMessageBox::Escape );
 
mb.setButtonText( QMessageBox::Yes, "Ok" );
mb.setButtonText( QMessageBox::Cancel, "Cancel" );
 
QPixmap exportSuccess( QPixmap::fromMimeSource( "message.png" ) );
mb.setIconPixmap(exportSuccess);
 
mb.exec();

QMessageBox mb("App", "Hello Message ",
QMessageBox::NoIcon,
QMessageBox::Yes | QMessageBox::Default,
QMessageBox::Cancel, QMessageBox::Escape );

mb.setButtonText( QMessageBox::Yes, "Ok" );
mb.setButtonText( QMessageBox::Cancel, "Cancel" );

QPixmap exportSuccess( QPixmap::fromMimeSource( "message.png" ) );
mb.setIconPixmap(exportSuccess);

mb.exec();

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Cris

[jacek]

Can we see the backtrace?

[cristiano]

Here it is the method.

void AppForm::primeUpdateQuery()
{
        QMessageBox mb("App",
                        "!!! Here message !!!",
        QMessageBox::NoIcon,
        QMessageBox::Yes | QMessageBox::Default,
        QMessageBox::Cancel, QMessageBox::Escape );
 
        mb.setButtonText( QMessageBox::Yes, "Ok" );
        mb.setButtonText( QMessageBox::Cancel, "Cancel" );
 
        QPixmap exportSuccess( QPixmap::fromMimeSource( "message.png" ) );
        mb.setIconPixmap(exportSuccess);
 
        /* It get the value of the QDataTable Current */
        QSqlRecord *getCurrentItemIdSql = new QSqlRecord();
        getCurrentItemIdSql = dataTable->currentRecord();
 
        register int i = dataTable->currentRow();
        if ( i == -1  ) i = 0; /* Always use the first row */
 
        else if ( getCurrentItemIdSql )
        {
                QSqlQuery queryUpdateSaida;
 
                switch( mb.exec() )
                {
                        case QMessageBox::Yes:
 
                                /* Now, it executes query for the exit of the occurrence */
                                queryUpdateSaida.prepare( QUERY_EXIT_OCCURRENCE "id_ocorrencia= :id_ocorrencia AND id_viatura= :id_viatura "
                                                "AND id_cidade= :id_cidade ;" );
 
                                queryUpdateSaida.bindValue( ":id_ocorrencia", getCurrentItemIdSql->value("id_ocorrencia").toInt() );
                                queryUpdateSaida.bindValue( ":id_viatura", getCurrentItemIdSql->value("id_viatura").toString() );
                                queryUpdateSaida.bindValue( ":id_cidade", getCurrentItemIdSql->value("id_cidade").toInt() );
 
                                if ( queryUpdateSaida.exec() )
                                {
                                        cout << "App ==> OK" << endl;
 
                                } else {
 
                                        cout << "App ==> Error" << endl;
                                }
 
                                dataTable->refresh(QDataTable::RefreshData);
                                break;
 
                        case QMessageBox::Cancel:
 
                                dataTable->refresh(QDataTable::RefreshData);
                                break;
 
                        default:
 
                                cout << "App ==> Case default" << endl;
 
                }
 
                return;
        }
}

void AppForm::primeUpdateQuery()
{
        QMessageBox mb("App",
                        "!!! Here message !!!",
        QMessageBox::NoIcon,
        QMessageBox::Yes | QMessageBox::Default,
        QMessageBox::Cancel, QMessageBox::Escape );

        mb.setButtonText( QMessageBox::Yes, "Ok" );
        mb.setButtonText( QMessageBox::Cancel, "Cancel" );

        QPixmap exportSuccess( QPixmap::fromMimeSource( "message.png" ) );
        mb.setIconPixmap(exportSuccess);

        /* It get the value of the QDataTable Current */
        QSqlRecord *getCurrentItemIdSql = new QSqlRecord();
        getCurrentItemIdSql = dataTable->currentRecord();

        register int i = dataTable->currentRow();
        if ( i == -1  ) i = 0; /* Always use the first row */

        else if ( getCurrentItemIdSql )
        {
                QSqlQuery queryUpdateSaida;

                switch( mb.exec() )
                {
                        case QMessageBox::Yes:

                                /* Now, it executes query for the exit of the occurrence */
                                queryUpdateSaida.prepare( QUERY_EXIT_OCCURRENCE "id_ocorrencia= :id_ocorrencia AND id_viatura= :id_viatura "
                                                "AND id_cidade= :id_cidade ;" );

                                queryUpdateSaida.bindValue( ":id_ocorrencia", getCurrentItemIdSql->value("id_ocorrencia").toInt() );
                                queryUpdateSaida.bindValue( ":id_viatura", getCurrentItemIdSql->value("id_viatura").toString() );
                                queryUpdateSaida.bindValue( ":id_cidade", getCurrentItemIdSql->value("id_cidade").toInt() );

                                if ( queryUpdateSaida.exec() )
                                {
                                        cout << "App ==> OK" << endl;

                                } else {

                                        cout << "App ==> Error" << endl;
                                }

                                dataTable->refresh(QDataTable::RefreshData);
                                break;

                        case QMessageBox::Cancel:

                                dataTable->refresh(QDataTable::RefreshData);
                                break;

                        default:

                                cout << "App ==> Case default" << endl;

                }

                return;
        }
}

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[wysota]

Jacek wanted a backtrace (a list of functions called when the process crashed generated by a debugger), not the code.

[cristiano]

Ok, I am using option -g in qmake.

% gdb ./app
(gdb) run
....
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x813e000 (LWP 100142)]
0x2845623c in QButton::animateClick () from /usr/X11R6/lib/libqt-mt.so.3
(gdb)

This is the error when it is Esc keyboard.

[wysota]

when in gdb use the "bt" command to print a backtrace.

[cristiano]

Ok,

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x813e000 (LWP 100077)]
0x2845623c in QButton::animateClick () from /usr/X11R6/lib/libqt-mt.so.3
(gdb) bt
#0 0x2845623c in QButton::animateClick () from /usr/X11R6/lib/libqt-mt.so.3
#1 0x28561971 in QMessageBox::keyPressEvent () from /usr/X11R6/lib/libqt-mt.so.3
#2 0x283fd31c in QWidget::event () from /usr/X11R6/lib/libqt-mt.so.3
#3 0x2836e545 in QApplication::internalNotify () from /usr/X11R6/lib/libqt-mt.so.3
#4 0x2836ed08 in QApplication::notify () from /usr/X11R6/lib/libqt-mt.so.3
#5 0x28307b78 in QETWidget::translateKeyEvent () from /usr/X11R6/lib/libqt-mt.so.3
#6 0x2830e37e in QApplication::x11ProcessEvent () from /usr/X11R6/lib/libqt-mt.so.3
#7 0x283205ec in QEventLoop::processEvents () from /usr/X11R6/lib/libqt-mt.so.3
#8 0x2838293b in QEventLoop::enterLoop () from /usr/X11R6/lib/libqt-mt.so.3
#9 0x2836d8a8 in QApplication::enter_loop () from /usr/X11R6/lib/libqt-mt.so.3
#10 0x285388c0 in QDialog::exec () from /usr/X11R6/lib/libqt-mt.so.3
#11 0x0805f082 in compForm::primeUpdateSaida (this=0x8265200) at src/comp/compForm.cpp:647
#12 0x080a3ab8 in compForm::qt_invoke (this=0x8265200, _id=74, _o=0xbfbfdf10) at src/comForm/moc_compForm.cpp:161
#13 0x283ca6a4 in QObject::activate_signal () from /usr/X11R6/lib/libqt-mt.so.3
#14 0x283cad15 in QObject::activate_signal () from /usr/X11R6/lib/libqt-mt.so.3
#15 0x286d1a4c in QButton::clicked () from /usr/X11R6/lib/libqt-mt.so.3
#16 0x2845695a in QButton::mouseReleaseEvent () from /usr/X11R6/lib/libqt-mt.so.3
#17 0x283fd2b7 in QWidget::event () from /usr/X11R6/lib/libqt-mt.so.3
#18 0x2836e545 in QApplication::internalNotify () from /usr/X11R6/lib/libqt-mt.so.3
#19 0x2836e801 in QApplication::notify () from /usr/X11R6/lib/libqt-mt.so.3
#20 0x2830ff1f in QETWidget::translateMouseEvent () from /usr/X11R6/lib/libqt-mt.so.3
#21 0x2830ee9f in QApplication::x11ProcessEvent () from /usr/X11R6/lib/libqt-mt.so.3
#22 0x283205ec in QEventLoop::processEvents () from /usr/X11R6/lib/libqt-mt.so.3
#23 0x2838293b in QEventLoop::enterLoop () from /usr/X11R6/lib/libqt-mt.so.3
#24 0x28382894 in QEventLoop::exec () from /usr/X11R6/lib/libqt-mt.so.3
#25 0x2836d880 in QApplication::exec () from /usr/X11R6/lib/libqt-mt.so.3
#26 0x08058165 in main (argc=1, argv=0xbfbfe9fc) at src/main.cpp:286
(gdb)

[wysota]

In my opinion you should either call

mb.setButtonText( QMessageBox::Escape, "Text for 'escape' button" );

mb.setButtonText( QMessageBox::Escape, "Text for 'escape' button" );

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or make Cancel and Escape the same button (by substituting the comma with a pipe "|"). I doubt Escape should be used as a button number, are you sure you want that?

[cristiano]

If it will be added “|” occurs error in the compilation.

QMessageBox::Cancel | QMessageBox::Escape


src/comp/compForm.cpp::540: error: no matching function for call to `QMessageBox::QMessageBox(const char[21], const QString, QMessageBox::Icon, int, int)'
/usr/X11R6/include/qmessagebox.h:192: note: candidates are: QMessageBox::QMessageBox(const QMessageBox&)
/usr/X11R6/include/qmessagebox.h:68: note: QMessageBox::QMessageBox(const QString&, const QString&, QMessageBox::Icon, int, int, int, QWidget*, const char*, bool, uint)
/usr/X11R6/include/qmessagebox.h:64: note: QMessageBox::QMessageBox(QWidget*, const char*)
*** Error code 1

[wysota]

Pass QMessageBox::NoButton as the third int argument.

[ederbs]

It makes thus.

...
QMessageBox::NoIcon, QMessageBox::Yes | QMessageBox:efault,
QMessageBox::Cancel | QMessageBox::Escape, QMessageBox::NoButton );