Exit button that does a task before exiting

[DrDonut]

You can try to write a destructor. This is automaticly called when you try to close your program and it would look like this:

MyClass::~MyClass()
{
  //your code...
}

MyClass::~MyClass()
{
  //your code...
}

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This way your code is automaticly executed right before the program closes.

Good luck!