After receiving the signal, a dialog box pops up

[libaineu2004]

My source code implements: after receiving the instanceStarted signal, a prompt dialog box pops up.
But this causes a problem:
After clicking OK, the dialog box closes, but the main process also exits.
How can I solve this problem?

Windows 11/Qt5.15.2/VS2019 x64

int main(int argc, char *argv[])
{
    SingleApplication a(argc, argv);
    QObject::connect(&a, &SingleApplication::instanceStarted, [=]() {
        QMessageBox::information(0, QObject::tr("info"), QObject::tr("I am running"));
    });

    Form w;
    w.show();
    return a.exec();
}

[itay-grudev]

Can you verify the exit code of your application. I bet it's neither 0 nor 1. You will likely see that the exit code is >=128 which will indicate an issue like SIGSEGV, code 139.

[libaineu2004]

Can you verify the exit code of your application. I bet it's neither 0 nor 1. You will likely see that the exit code is >=128 which will indicate an issue like SIGSEGV, code 139.

I add std::cout print information. But there is no return value because the exe will crash.
Windows 11/Qt5.15.2/VS2019 x64

int main(int argc, char *argv[])
{
    SingleApplication a(argc, argv);
    QObject::connect(&a, &SingleApplication::instanceStarted, [=]() {
        QMessageBox::information(0, QObject::tr("info"), QObject::tr("I am running"));
    });

    Form w;
    w.show();
    int ret = a.exec();
    std::cout << ret << std::endl;
    return ret;
}

[itay-grudev]

I meant the exit code you get because of the crash. It's displayed either in QtCreator when you check the application output or if you run it manually through the terminal and after it crashes run: echo $?.

[libaineu2004]

I meant the exit code you get because of the crash. It's displayed either in QtCreator when you check the application output or if you run it manually through the terminal and after it crashes run: echo $?.

Why does the exe crash? How to fix it?

[itay-grudev]

What's your exit code?

[libaineu2004]

What's your exit code?

I am using Windows operating system, and I cannot capture this exit code when the exe crashes. Can you run my source code to see if it crashes as well?