如果程序完成，QProcess exe不会关闭

Question

My problem is that I am starting an executable in a QProcess like the following:

QProcess Work;
Work.start(program.exe);

This executable runs since it has been started in background and I can send requests to it. If I have finished I am closing the executable the following way:

Work.close();

But if I am looking at the Taskmanager the program.exe is running furthermore. I dont understand that behaviour because I thought the executable would been stopped if I close the Process.

Answer 1

You should use void QProcess::terminate() or void QProcess::kill() for it.

terminate() - attempts to terminate the process.

kill() - kills process immediately.

Answer 2

I had a very similar case, although I was working on linux embedded with QT 4.8. Not sure if this can help you, but since I can't put it in a comment, I have to make a separate answer.

Do you set a parent to your QProcess? In my case, I instantiated QProcess like this

QProcess *p = new QProcess;

and I could see in the running processes list that each time I instantiated a new QProcess, I got a new process that couldn't be closed by close() , terminate() or kill() . When I finally rewrote the code like this

QProcess *p = new QProcess(mainW); //mainW was my GUI class, which handled also the closing of the process

the problem solved itself, I didn't even need to call any function to close the process. In my case I was sure the processes I called were finishing, since almost all of them were audio files, so I could hear them finishing. The others were processes that my program waited to complete, so again I was sure they ended because my program wasn't stuck waiting for them,

Hope this can help, despite the different OS.