Terminating process after closing QWidget

[Binary91]

Hi,

I have a single QWidget that is defined and showed in the process' main function, like this:

// main.cpp
 
#include "main.h"
 
int main(int argc, char *argv[])
{
  QApplication application(argc, argv);
  clsWindowMain windowMain();
  windowMain.showMaximized();
 
  int ret = application.exec();
 
  delete(settings);
  return ret;
}

// main.cpp

#include "main.h"

int main(int argc, char *argv[])
{
  QApplication application(argc, argv);
  clsWindowMain windowMain();
  windowMain.showMaximized();

  int ret = application.exec();

  delete(settings);
  return ret;
}

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When I run the program and close the QWidget by mouse click, the whole process terminates.

BUT: When I create a button that should manually close the QWidget like this:

void clsWindowMain::slotButtonClicked()
{
this->close();
}

void clsWindowMain::slotButtonClicked()
{
this->close();
}

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... then the QWidget also closes, but the process is still working in background. I can see it when I open the process manager in windows and I can see it when I try to re-run the program...

Does anybody have a clue why it is not working?

Thank you in anticipation!