Qt Console application in Ubuntu

[feraudyh]

Hello,
I usually run Qt in Windows.
I created a Qt Console Application in Ubunti with the following code:

#include <QtCore/QCoreApplication>
#include <QtDebug>
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    qDebug()<<"Hello World\n";
 
    return a.exec();
}

#include <QtCore/QCoreApplication>
#include <QtDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    qDebug()<<"Hello World\n";

    return a.exec();
}

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unfortunately it displays nothing at all, like it does in Windows.
There is a config += console in the project file.
What did I do wrong?

[ChrisW67]

Nothing, the program outputs "Hello World" to the terminal just fine (and then does not terminate). How are you starting the program?

[feraudyh]

I just click on that run button that looks like a green triangle: |>

I may have screwed up my installation of Qt by installing an (extra?) Qt debugger when one was already installed by default.
Maybe I should uninstall all things Qt and reinstall just QtCreator.

[anda_skoa]

You should see the string in the "Application Output" tab in Qt Creator, just like on Windows.

Cheers,
_

[feraudyh]

Hi there,
No nothing in the "Application Output" tab.
Nothing in the console either.
If I change the program to add

#include <stdio.h>
...
printf("Hello again\n");

there is no visible effect.
What's more I have uninstalled QtCreator and it asked me to uninstall "debug symbols for Qt Creator"
I also uninstalled Qt Linguist and Qt Designer.
Then I reinstalled Qt Creator.
The application still displays nothing.

[Radek]

One possible cause: Qt Creator does not cooperate well with every Linux terminal. Check the terminal setting and make sure that it is xterm -e and not econsole -e or something similar. Try again (try the printf() first).

I have solved this in Debian but I have got an error output in "Application Output" window at least. The Creator tried some piping somewhere and failed. Setting the console to xterm solved the problem.

[feraudyh]

Thanks,
Could you be more explicit on how you change a terminal setting?

[Radek]

Tools -> Options -> Environment

[feraudyh]

Thanks Radek. This solved the problem.
I put xterm -e instead of the initial x-terminal-emulator -e
The trouble is that this part of the options is very obscure, no drop down list.

[MI]

Advice :: remember to always use qDebug()<< function for output in ubuntu/linux because cout<< works only in windows and not in ubuntu/linux

[ChrisW67]

Umm, no... std::cout is a standard part of the C++ library and is fully functional in both environments.