Hello, this is my code: QProcess process; process.start("sudo apt update"); process.waitForFinished(-1); QString stdout = process.readAllStandardOutput(); QString stderr = process.readAllStandardError(); I have 3 questions: How can I get realtime stream of process output? Let's say that process will wait for user input,t hen it will not finish, but I would like to get output from that running process. Can I send key to that process? For example process is waiting for Y or N press, so can I send "Y" key to it? How can I run that process as sudo? Forexample when my app hit that code where is sudo command then user will have to write password to some system popup.

@ t0msk said in Get output stream from QProcess : How can I get realtime stream of process output? First: do not wait for process to finish. Connect a slot to https://doc.qt.io/qt-5/qprocess.html#readyReadStandardOutput In that slot call https://doc.qt.io/qt-5/qprocess.html#readAllStandardOutput "Can I send key to that process?" - yes: process.write("Y"); See https://doc.qt.io/qt-5/qprocess.html for an example: QProcess gzip; gzip.start("gzip", QStringList() << "-c"); if (!gzip.waitForStarted()) return false; gzip.write("Qt rocks!"); gzip.closeWriteChannel(); if (!gzip.waitForFinished()) return false; QByteArray result = gzip.readAll();

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Get output stream from QProcess

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T t0msk
26 Oct 2019, 08:44
@JonB said in Get output stream from QProcess:
@t0msk
- You only need to use sudo because you are going apt update, which does a system-wide update of stuff. Why does your app need that? That's my point.
- Yes to what you wrote about sudo -S.
- Like I said I have never used polkit so it's up to you to read up. You say "and I didn't have to set up polkit on my system", but isn't the point that you are being prompted for a password here where the point of using polkit is to allow stuff through without requiring a password? So it seems to me it is not currently set up to allow whatever you are trying through without a password, and an admin would need to configure it to make it allow no password here?
As I said many times apt update is only example, and if you use pkexec it will show system popup like on screenshot in my last post, then you have to enter password and after that command will be executed.
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JonB

wrote on 29 Oct 2019, 08:12 last edited by JonB

#21

@t0msk

As I said many times apt update is only example, and if you use pkexec it will show system popup like on screenshot ...

@jsulm has leapt to my defence :) And as I have said many times, my question is not about apt update but about why you need to run it or anything else sudo from your program? This equally applies if you go pkexec (though the whole point of that is it's part of polkit, and the point of polkit is that you are supposed to configure it so that it does not "show system popup like on screenshot").
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29 Oct 2019, 08:12