Qt implementation of MessageBox

Question

Referencing an earlier question: GTK implementation of MessageBox

I have a question very much like that one, except substituting Qt for GTK.

As in that question, what is the least I would need to do to show a message dialog using Qt, from an application that is not already a Qt application?

I presume something like the following would need to occur:

Initialize Qt and its event loop
Install idle callback to invoke dialog
Quit event loop and finalize Qt when dialog is dismissed.

opc0de · Accepted Answer · 2012-10-16 06:33:28Z

0

You are tring to show a message box from a console application right ?

If this is correct you need to add this line in your pro file:

QT += gui

After you have done that in your main.cpp file write something like this. Qt creates an event loop for you

#include <QtCore/QCoreApplication>
#include <QTextStream>
#include <QMessageBox>
#include <QApplication>




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

    QMessageBox::information(NULL,"Hello","Salut","Ok");

    return a.exec();
}

answered Oct 16, 2012 at 6:33

opc0de

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2 Comments

MSalters Over a year ago

"from an application that is not already a Qt application", but you're assuming that a QMake .pro file already exists.

kbluck Over a year ago

Yes, I would not be using QMake. Build config is not a concern for me. I don't see anything here that would tell the main event loop to terminate. Does the message box become the "main window," thus causing the event loop to terminate when it closes?

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