Dear developer, I'm new in this forum, and also in the Qt community, this forum and community is great! Said that I will expose my problem, probably a rookie question... I've created a GUI with Qt, and I want to use a button to launch a script in the linux terminal. Let's say the command ls -l This is my solution which is not working, I expect an output in the terminal, but I don't get anything void MainWindow::onExecuteButton_clicked() { QProcess process; process.start("ls", QStringList() << "-l"); process.waitForFinished(); } I also tried to use system("ls -l"); but again I dont get any output. I'm pretty it is because I'm new in Qt, and the solution must be very simple but I cant get it. Any advice? Thanks in advance

@ grullo said in Run command line from Qt app in linux : I would like to show in real time the standard output to the users, instead of waiting until the end of the process. Is this possible? Yes, absolutely you can, but you must change where you read from the sub-process to use signals & slots. Set up to use readyReadStandardOutput/Error signals , attached to your slots which make your readAllStandardOutput/Error() calls. Remove the process.waitForFinished() , instead put a slot on finished signal. Allow your on_browseParticles_clicked() to exit after the process.start() call, so that it returns to the main Qt event loop. The process now runs in the background, sending you output to capture till finished is received. You should also slot onto other signals, like errorOccurred . You may also want to use setProcessChannelMode(QProcess::MergedChannels) . All the above are in the docs page. Be aware that it is possible that your sub-process's output will not be received by your call program at the moment it is produced. It may be buffered at the sending side, till a newline is output or a certain number of bytes have been produced, and you may not be able to do anything about that (unless you have the source of the sub-process).

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Run command line from Qt app in linux

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grullo

wrote on 28 Apr 2020, 16:52 last edited by

#21

Thanks for your replies, I'm sorry for the delay in my response. This week we had a peak of work.

Fortunately I could fix it with startDetached. I'm not sure exactly, why doing this the script runs until finishing, but it's working.

Kind regards
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P Pl45m4 referenced this topic on 2 May 2023, 12:40

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28 Apr 2020, 16:52