how to launch a wizard from the mainwindow's File Menu

[pkjag]

hi all
i was wondering how i'd go about launching my wizard from the file menu of the mainwindow using the New action in the file menu, so that when i click the New action the wizard is successfully launched.

here's a snapshot of the main.cpp file

#include <QApplication>
#include <QTranslator>
#include <QLocale>
#include <QLibraryInfo>
 
#include "SkoolCalcWizard.h"
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
 
 
    QApplication app(argc, argv);
 
#ifndef QT_NO_TRANSLATION
    QString translatorFileName = QLatin1String("qt_");
    translatorFileName += QLocale::system().name();
    QTranslator *translator = new QTranslator(&app);
    if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(translator);
#endif
 
    MainWindow window;
 
    window.show();
 
    return app.exec();

#include <QApplication>
#include <QTranslator>
#include <QLocale>
#include <QLibraryInfo>

#include "SkoolCalcWizard.h"
#include "mainwindow.h"

int main(int argc, char *argv[])
{


    QApplication app(argc, argv);

#ifndef QT_NO_TRANSLATION
    QString translatorFileName = QLatin1String("qt_");
    translatorFileName += QLocale::system().name();
    QTranslator *translator = new QTranslator(&app);
    if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(translator);
#endif

    MainWindow window;

    window.show();

    return app.exec();

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And here's the part of the mainwindow where i've tried defining the newFile() action to suit my needs

void MainWindow::newFile()
{
 
 
    SkoolCalcWizard *wizard = new SkoolCalcWizard;
    return wizard->exec();
 
 
}
 
void MainWindow::createActions()
{
    newAct = new QAction(tr("&New"), this);
    newAct->setShortcuts(QKeySequence::New);
    newAct->setStatusTip(tr("Create a new file"));
    connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
}

void MainWindow::newFile()
{
    

    SkoolCalcWizard *wizard = new SkoolCalcWizard;
    return wizard->exec();


}

void MainWindow::createActions()
{
    newAct = new QAction(tr("&New"), this);
    newAct->setShortcuts(QKeySequence::New);
    newAct->setStatusTip(tr("Create a new file"));
    connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
}

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your help will be much appreciated, thanks in advance!!!!!

[wysota]

The code seems fine apart the return call which tries to return a value from a function returning void. Also there is no method in QAction called setShortcuts() but there is one called setShortcut().

Also is there any message you are getting in the console? Like about missing slots or something similar?

[pkjag]

Hi, so thanks for replying and the warning, i'm new here so will work on that.
I do get a compiler error about the return type, so i changed it to this:

int MainWindow::newFile()
{
 
 
    SkoolCalcWizard wizard;
    return wizard.exec();
 
 
}

int MainWindow::newFile()
{
    

    SkoolCalcWizard wizard;
    return wizard.exec();


}

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And also updated the mainwindow.h, the code did run but when i clicked the File menu's New action in the mainwindow, the window immediately exits.
Notice i also replaced the pointer notation with just a normal object declaration, i don't know if this has a significant impact??
So i did this:

void MainWindow::newFile()
{
 
 
    SkoolCalcWizard wizard;
    wizard.show();
 
 
}

void MainWindow::newFile()
{
    

    SkoolCalcWizard wizard;
    wizard.show();


}

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But then the program runs and does the same thing as above, it immediately exits once i click on the New action.
And no i don't get errors on missing slots

[aamer4yu]

The window will no doubt exit immediately since you are creating it on stack.

Also mention what problem you are exactly getting.
We also need the declaration for class SkoolWizard, without which we can only make guesses...

[wysota]

So i did this:

void MainWindow::newFile()
{
 
 
    SkoolCalcWizard wizard;
    wizard.show();
 
 
}

void MainWindow::newFile()
{
    

    SkoolCalcWizard wizard;
    wizard.show();


}

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But then the program runs and does the same thing as above, it immediately exits once i click on the New action.

You create a local variable that goes out of scope once the function ends. While exec() is a blocking call that doesn't return until the dialog is closed, show() behaves differently -- it schedules an event to show the widget and returns immediately.

[pkjag]

The code for the SkoolCalc wizard is very long like 500 lines and i'm nt sure it'll be practical posting it here cause it's tight.
I tested it before writing the mainwindow code and it runs perfectly
I did this:

#include <QApplication>
#include <QTranslator>
#include <QLocale>
#include <QLibraryInfo>
 
#include "SkoolCalcWizard.h"
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
 
 
    QApplication app(argc, argv);
 
#ifndef QT_NO_TRANSLATION
    QString translatorFileName = QLatin1String("qt_");
    translatorFileName += QLocale::system().name();
    QTranslator *translator = new QTranslator(&app);
    if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(translator);
#endif
 
    SkoolCalcWizard wizard;
 
    wizard.show();
 
    return app.exec();
}

#include <QApplication>
#include <QTranslator>
#include <QLocale>
#include <QLibraryInfo>

#include "SkoolCalcWizard.h"
#include "mainwindow.h"

int main(int argc, char *argv[])
{


    QApplication app(argc, argv);

#ifndef QT_NO_TRANSLATION
    QString translatorFileName = QLatin1String("qt_");
    translatorFileName += QLocale::system().name();
    QTranslator *translator = new QTranslator(&app);
    if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(translator);
#endif

    SkoolCalcWizard wizard;

    wizard.show();

    return app.exec();
}

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All i can say is that i don't think its necessary, the itchy bit is how to interface my wizard with the mainwindow. But if you think otherwise please convince me.

[wysota]

Is there a question here somewhere?

[pkjag]

Yeah its at the beginning of the thread.

[wysota]

So what is the meaning of post #6?

[pkjag]

That was meant to address aamer4yu's concerns for me not posting the whole code.

[wysota]

But that code differs from what you posted in #1. So which one is correct, which class is the main window and which is not?

Anyway, your vanishing window problem comes from the already mentioned twice problem that you are allocating the window on the stack that unwinds immediately after the function completes its course.

[pkjag]

The code at #6 is meant to launch my SkoolCalcWizard and i wrote it way before i wrote the mainwindow.cpp code, its basically the execution part in main.cpp to confirm that my wizard actually runs. So i posted that to reassure aamer4yu that i needn't post the whole of my SkoolCalcWizard.cpp code here since the wizard's code is tight. It isn't really important in this context.
So the original question is at #1.