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Editorial Team
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Asked: 2026-05-13T01:01:31+00:00

I have a GUI application, which creates a QProcess inside, catches its output and

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I have a GUI application, which creates a QProcess inside, catches its output and shows it on a form. I need to somehow catch key events from the form to pass them to QProcess (to make it fell as close as possible to real terminal window).

So, I suppose, I should process keyReleaseEvent() and somehow transform either event.text() (which is QString) or event.key() (which is int) to argument, suitable for process.write() (which takes char* or QByteArray). Is there some recommended way to do such a conversion (taking into account localization issues, ctrl/alt/shift modifiers and so on)? I do not really want to construct some sort of mapping from key() return values to char* strings; and text() drops modifiers.

Moreover, if I start process with command bash -c sudo something in QProcess, it exits instantly, complaining that “no tty present and no askpass program specified”, so I may be doing something completely wrong…

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1 Answer

  1. Editorial Team

    The problem is more than just deciding what to write to the process.

    You can’t emulate a terminal just by reading/writing stdout/stdin of a process, it’s more complicated than that. Think about the program less, or any pager, for example. How does it know how many lines to print at a time? It needs information about the terminal which isn’t represented through stdin/stdout/stderr.

    Emulating a terminal is beyond the scope of QProcess. If you’re really sure you need to do this then use some existing Qt-based terminal emulator as a starting point (e.g. Konsole).

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