Console app close issue

Cobra91151

Hi! I want to read some ping information, the problem is the app closes after ctrl + c shortcut is activated, so I can't read any data.

#include <QCoreApplication>
#include <QDebug>
#include <QProcess>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QProcess::execute("ping.exe", QStringList() << "8.8.8.8" << "-t");
    system("Pause");
    return a.exec();
}

system("Pause") function doesn't work in this case. Any ideas? Thanks.

aha_1980

@Cobra91151 have you tried adding the parameter -n 4 to ping? that should cause ping to exit after 4 attempts.

Cobra91151

@aha_1980

The problem here is something different, it loops data well but ctrl + c should stop it and display the statistics such as in cmd but it exits the app instead.

It seems that when ping.exe is closed, it also closes my app. The issue is present when run the app from the directory not from Qt Creator.

I have changed code to:

    QProcess pingProcess;
    QObject::connect(&pingProcess, &QProcess::readyReadStandardOutput, [&pingProcess]() {
        qDebug() << pingProcess.readAllStandardOutput().trimmed();
    });
    QObject::connect(&pingProcess, &QProcess::readyReadStandardError, [&pingProcess]() {
        qDebug() << pingProcess.readAllStandardError().trimmed();
    });
    QObject::connect(&pingProcess, static_cast<void (QProcess::*)(int)>(&QProcess::finished), [=]() {
       system("Pause");
    });
    pingProcess.startDetached("ping.exe", QStringList() << "8.8.8.8" << "-t");
    pingProcess.waitForFinished();

It works well but when execute from the directory it closes after the ctrl + c and no stats available.

Screenshot:

alt text

Info:
Ping the specified host until stopped. To see statistics and continue - type Control-Break; To stop - type Control-C.

So when I press ctrl + break the app displays the stats and continue working. When I press Ctrl + C the app closes but it should display statistics and stop executing ping. How to fix it? Thanks.

Cobra91151

It seems that this is the default behavior by ping.exe, so I decided to change my app to get the ping loop number specified by a user.

Code:

int count = 0;
cout << "Enter number to proceed the ping loop (0 to exit): ";
cin >> count;

if (count >= 1) {
    QProcess pingProcess;
    pingProcess.execute("ping.exe", QStringList() << "8.8.8.8" << "-n" << QString::number(count));
    cout << endl;
    system("Pause");
}

return 0;

And now it works well.

aha_1980

@Cobra91151 said in Console app close issue:

pingProcess.startDetached("ping.exe", QStringList() << "8.8.8.8" << "-t");

I think your problem is the "-t" parameter. What happens if you replace that with "-n" << "4" ? Because with "-t" ping never stops, while with "-n 4" it only pings four times.

Disclaimer: I cannot test as I don't have Windows at hand...

Edit: Ah, I see you got it. So please close this thread as SOLVED. Thanks

aha_1980

This post is deleted!