#include <fstream>
#include <chrono>
#include <thread>
#include <iostream>
#include <QApplication>
#include <QFileSystemWatcher>

int main(int argc, char* argv[])
{
  QCoreApplication app(argc, argv);

  QFileSystemWatcher* watcher = new QFileSystemWatcher();
  watcher->connect(watcher, &QFileSystemWatcher::fileChanged, [&] {
    std::cout << "done\n";
    app.quit();
  });

  auto path = R"(C:\Users\Philippe\MyTextFile.txt)";
  {
    std::ofstream f(path, std::ios::out | std::ios::trunc | std::ios::binary);
    f.close();
  }

  watcher->addPath(path);

  //std::this_thread::sleep_for(std::chrono::milliseconds(50));

  std::ofstream f(path, std::ios::out | std::ios::trunc | std::ios::binary);
  f.close();

  return app.exec();
}