Question PyQt5 sending a Ctrl-C command to a running command prompt

[salm2s]

Hi there,
So i have this push button which is connected to a function to run a small .bat file that prints "Hello there"
I also created another push button called "Stop".

Is there a way i can make a function to send a Ctrl-C or a terminate signal to the command prompt?

Thanks,
salm2s

 

[Ralston18]

Not sure about the overall context of your code but the following link should provide or at least guide you in the desired direction.

https://superuser.com/questions/1375721/how-to-terminate-a-python-process-similar-to-ctrl-c

You may find "Character Encoding" useful:

https://realpython.com/python-encodings-guide/

 

[null_dev]

Is there a way i can make a function to send a Ctrl-C or a terminate signal to the command prompt?

Not a good idea.

By button start, you should keep the process handler/instance in you app, and by stop operation, simply kill the process by OS level.

Please mind that Ctrl + C works with some specific TTYs, and it actually send SIGTERM to process. Please mind that process may ignore it(but not by default)

Another option(not really legit) is for asking the process pid when you start it up, later you could ask the OS using kill command

If need more help, you may share some coding you have done so far please.

Hope it helps

 

[salm2s]

Not a good idea.

By button start, you should keep the process handler/instance in you app, and by stop operation, simply kill the process by OS level.

Please mind that Ctrl + C works with some specific TTYs, and it actually send SIGTERM to process. Please mind that process may ignore it(but not by default)

Another option(not really legit) is for asking the process pid when you start it up, later you could ask the OS using kill command

If need more help, you may share some coding you have done so far please.

Hope it helps

Ah ok, so i should just let the user click the 'x' rather than a stop button?

 

[null_dev]

Ah ok, so i should just let the user click the 'x' rather than a stop button?

No no no, please mind, if you kill a parent process(let say your qt app), so it might not kill its child process, so even if you kill your qt process, the command/bat file could continue its process.

You may please share some code, how do you use QT? C/C++? python?
How do you run that cmd process?

When you start a process(run a bat for example), OS gives the parent app(QT app here)a handler that points out to the child process.
Anytime later, parent, is able to kill the child process peacefully or by-force.

 

[salm2s]

No no no, please mind, if you kill a parent process(let say your qt app), so it might not kill its child process, so even if you kill your qt process, the command/bat file could continue its process.

You may please share some code, how do you use QT? C/C++? python?
How do you run that cmd process?

When you start a process(run a bat for example), OS gives the parent app(QT app here)a handler that points out to the child process.
Anytime later, parent, is able to kill the child process peacefully or by-force.

I meant like when the command prompt opens, the user just clicks the red x. Btw this is for windows.

 

[salm2s]

Apart from this, I just have another question:
How can I run a command on Linux in python code to start a new terminal window, cd to a file in the folder and run a application?

 

[null_dev]

How can I run a command on Linux in python code to start a new terminal window, cd to a file in the folder and run a application?

Maybe you don't need running a command line to run another process. not logical(unless you would run a batch of commands).

You could ask the OS to run the target app(in target path) directly without any middle-cmd