close/kill another Windows process which is started by run a .bat in Qt app

Vijaykarthikeyan

@jsulm With the help of GStreamer Library?

jsulm

No.

process->start("gst-launch-1.0", QStringList() << HERE_PUT_THE_PARAMETERS_AS_LIST);

JonB

@Vijaykarthikeyan
Don't understand. @jsulm is just asking why you use cmd /c ... at all? Use QProcess::startCommand() directly on your string starting with "gst-launch-1.0 ...". Then you don't have a cmd process and a gst-launch-1.0 one to deal with.

@jsulm
The user probably doesn't want to split his string into lots of separate arguments to pass to start() :) That's why I suggest he might want to use startCommand().

Vijaykarthikeyan

@JonB Oh..sorry..actually..I dont know about startcommand() until now..I'll try it and feedback you

Vijaykarthikeyan

@JonB Sorry to interrupt you..Just now gone throught that documentation,this startCommand() method is available for the Qt versions 6.x but I'm using 5.15.2.

that's why i didnt know about this command

JonB

Always helps if you tells which version you are using for any question!

To use start() then (without cmd /c) you must chop your line up into separate arguments at every (non-embedded) space. probably including each of those ! which are being used as "pipes" on the command passed to gst-launch-1.0. Do so manually in code source, or maybe use QString::split() on space if you want. I think QStringList QProcess::splitCommand(QStringView command) is available to you in 5.15. [Yes, it was introduced at 5.15 if you want to use it.]

Vijaykarthikeyan

@JonB Ok..Running..But..when process->kill() executed..it is not closing that process.Why? How to close it by process->processId()

JonB

Why? I don't know.
Windows/DOS has a taskkill <pid> command, I believe. You could issue that via another QProcess (try it first from command line). I don't know if that will work when QProcess::kill() does not. I do not know whether gst-launch-1.0 is itself a "wrapper" for spawning other processes.

Vijaykarthikeyan

@JonB ok..understand..Can you please calrify one thing.. Will terminatinf the QProcess will terminate the process pointer or the process which is triggered by the QProcess?

JonB

@Vijaykarthikeyan It should ~~delete~~ terminate the process created on the QProcess object, i.e. just what you would expect.