How can I create a process in C++ or Qt?

logancale2015

hello people a need your help, can be with qt or c++, i want to create a process BUT a process that use a function of my program not an external program, something like this .... sorry for the example and forgive my english thanks

void count(){
bbla
bla
bla
}

int main(){
QProcess p = new QProcess(count());
p.start();
}

mrjj

Hi
When you select New Project, you can select Qt Console Application.
THen you get a non gui app.
You will have to read the parameters in your app and respond to them.

also
QProcess(count());

is never going to happen. Syntax is not valid.

you must use the normal way of passing parameters.

like

QStringList arguments;
arguments << "-style" << "motif";
 
QProcess *myProcess = new QProcess(this);
myProcess->start(program, arguments);

logancale2015

yes i know about the sintax that was an example to ilustrate it

VRonin

I think what you want is a thread, not a process.

#include <iostream>
#include <thread>
void count(){
for(int i=0;i<100;++i)
std::cout << i;
}
int main(){
std::thread countThread(count);
// do other stuff
countThread.join();
return 0;
}

logancale2015

@VRonin no no a thread the think is that when i close the main app the thread is going to close to and i dont want this

J.Hilk

@logancale2015

in your main.cpp

QApplication qApp;
qApp.setQuitOnLastWindowClosed(false);

and your app wont terminate when you close the window.

logancale2015

@J.Hilk is a console app

mrjj

@logancale2015
Hi
if Qt console app then it will run until quit() is called.
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
return a.exec(); // stays here
}

SGaist

Hi,

This looks like it could be a job for QtConcurrent::run.