如果我们关闭主应用程序，以QProcess开始的过程不会退出

Question

Suppose I start a process in terminal in Linux, if the terminal is closed the child process started in terminal also exits (even if process is started using sudo). But if I start a process (say) p1 using QProcess inside a GUI application, and then close the gui application, process p1 still keeps running, as if it is a daemon, even if I don't start the process using QProcess::startDetached() .

process1->start("gksudo",args);

and

process1->terminate();
process1->close();

in closeEvent.

Answer 1

Try adding

delete process1;

in GUI class destructor.

Answer 2

How are you initializing your QProcess? When I did the following (on Windows) in mainwindow.cpp my child process closed when I closed my main application.

QProcess* proc = new QProcess(this);
proc->start("notepad.exe q:/blah2.txt");

By making MainWindow a parent of QProcess, MainWindow will destroy and close it during its QObject destructor.