Qt Print Dialog won't open

[cadol001]

QPrinter printer;
QPrintDialog* printDialog = new QPrintDialog(&printer, 0);
printDialog->setAttribute( Qt::WA_DeleteOnClose );
printDialog->setModal(true);
printDialog->open();

This won't work, but if I call exec() it shows. What do I do? I can't use exec since it will block things.

[Christian Ehrlicher]

@cadol001 said in Qt Print Dialog won't open:

I can't use exec since it will block things.

What should be blocked? The user must do some settings, then you can continue.

[cadol001]

@Christian-Ehrlicher I don't know what you mean, but I would like to get it to work with open(). The docs for 5.15 has an override method for open() yet, even with a minimal example such as this one, the print dialog doesn't open

exec() blocks everything. nothing should be blocked

[Christian Ehrlicher]

Then show some more code. Don't know why exec() will not work here though. It does not block anything (execept the program control flow).

[cadol001]

@Christian-Ehrlicher that is exactly why I cannot use exec()

#include "mainwindow.h"

#include <QApplication>
#include <QPrinter>
#include <QPrintDialog>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    QPrinter printer;
    QPrintDialog* printDialog = new QPrintDialog(&printer, 0);
    printDialog->setAttribute( Qt::WA_DeleteOnClose );
    printDialog->open();
    return a.exec();
}

All I did was put this snippet in the default widgets project. Switching out open() with exec() just magically works. I just can't use exec. Thanks

[Christian Ehrlicher]

Your testcase (apart from MainWindow -> QMainWindow) works fine here on windows.

[mpergand]

@cadol001
Doesn't work for me as well on Mac 10.15 Qt5.15.

[cadol001]

@mpergand @Christian-Ehrlicher thank you, I guess it is a Mac issue. I just tried on Qt 6.5 on Mac, and it also does not work.

[SimonSchroeder]

Maybe try show() instead. I am not sure if it does anything different than open(), though.

[SGaist]

Hi,

@cadol001 said in Qt Print Dialog won't open:

@Christian-Ehrlicher that is exactly why I cannot use exec()

#include "mainwindow.h"

#include <QApplication>
#include <QPrinter>
#include <QPrintDialog>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    QPrinter printer;
    QPrintDialog* printDialog = new QPrintDialog(&printer, 0);
    printDialog->setAttribute( Qt::WA_DeleteOnClose );
    printDialog->open();
    return a.exec();
}

All I did was put this snippet in the default widgets project. Switching out open() with exec() just magically works. I just can't use exec. Thanks

I replaced MainWindow by QMainWindow and tested both printDialog->open() and printDialog->exec() and both worked fine.

With Qt 6.6.0.