如何从bash脚本捕获终端输出并将其显示在Qt UI中？

Question

I've written a simple GUI that guides the user through a checkout/checkin procedure, and then runs a bash script when the user clicks a GUI button.

I'd like to create a field within the GUI and display the output of the script. Right now I'm using system() (stdio) to run the script, but piping the script's output to a text field in my gui seems messy.

Would using QProcess be a better approach? If so, how would I get started?

Also, what Qt Widget/container would you recommend?

Answer 1

Would using QProcess be a better approach? If so, how would I get started?

By looking at the QProcess documentation , you can do something similar to this:

QString program = "/usr/bin/ls";
QStringList arguments{"-lahR"};
QProcess *myProcess = new QProcess(parent);
myProcess->start(program, arguments);
connect(myProcess, &QProcess::readyReadStandardOutput, [myProcess] {
  qDebug() << "Got output from process:" << myProcess->readAllStandardOutput();
  // Or copy the data to QPlainTextEdit::appendPlainText()
});

You probably also want to capture standard error output. You can either do a second connect() or use QProcess::setProcessChannelMode(QProcess::MergedChannels) .

Executing shell scripts with QProcess should work fine, as long as they are marked with #! interpreter [optional-arg] #! interpreter [optional-arg] at the beginning. This is because QProcess internally uses fork + execvp , and the documentation for that clearly states shell scripts are allowed.

Don't forget to delete your QProcess when the command has finished.

Also, what Qt Widget/container would you reccomend?

Sounds like a job for QPlainTextEdit . Alternatively, you can use the slower QTextEdit , which brings additional features.