Latest Qt, ubuntu, C++ based app, could not using arrows and scroll

JonB

@JacobNovitsky
A shell running in a terminal does the "previous command" stuff, nothing inherent about keys. There is nothing to "fix". You have to explain where you are pressing arrow keys in a program.

JacobNovitsky

sorry, its terminal :)

JonB

@JacobNovitsky
You have written a terminal with Qt and C++?
Or you are using one written by a third-party?

JacobNovitsky

@JonB its qt creator output terminal in Ubuntu environment

if i call terminal with shortcut Ctrl T or just open app it works
f i call terminal from Qt creator it wont

jsulm

@JacobNovitsky said in Latest Qt, ubuntu, C++ based app, could not using arrows and scroll:

f i call terminal from Qt creator it wont

Please show the code where you're opening the terminal...
And I guess after opening the terminal from your app there are no "previous" commands yet.

JonB

@JacobNovitsky said in Latest Qt, ubuntu, C++ based app, could not using arrows and scroll:

@JonB its qt creator output terminal in Ubuntu environment

I assume this means the option in Creator which says something like "Run a terminal".

If so, you are not understanding that this is not the same as some "Terminal" program from the OS:

The OS opens a terminal running a shell (e.g. bash) for you. That shell reads what you type, runs commands for you, allows output. It interprets the arrows as going through the history and implements that.
Creator's "Run in terminal" option purely allows your Qt program to have a terminal window for input/output. It does not run some shell there. There is no history of commands to go through.

If you want an actual terminal running a shell from a Qt application, not just for plain I/O, you will need your program to use QProcess to spawn a suitable terminal with a shell, such as xterm or whatever your Terminal is.

JacobNovitsky

@JonB now the thing is more clear :)
can u share the code, please?

having this, and this yet does nothing

#include <QCoreApplication>
#include <QProcess>
int main()
{
while(true){
    QProcess process;
    process.start("ls");
    process.waitForFinished();

    QString output = process.readAllStandardOutput();
    qDebug() << output;
    }

    return 0;
}

JonB

@JacobNovitsky
I don't think QProcess::waitForFinished() will return since you do not have the Qt event loop running. (Put qDebug()s in to see which line is being reached.) Get rid of while and write it as a proper Qt program.

JacobNovitsky

@JonB After two years with Qt as IDE I'm really stuck now
can you please provide working sample, to make the terminal in Ubuntu work smoothly like in Windows?

jsulm

@JacobNovitsky said in Latest Qt, ubuntu, C++ based app, could not using arrows and scroll:

Qt as IDE

Qt isn't an IDE.
As @JonB pointed out you need running Qt event loop to be able to use signals/slots. This is very basic Qt.
To start Qt event loop you need to call https://doc.qt.io/qt-6/qapplication.html#exec like in any proper Qt application. See https://doc.qt.io/qt-6/qapplication.html for an example.