[HELP] window won't show after build

[toutarrive]

Create your main in a separate file

To Have an app running and entering the Qt event loop:

int main(int argc, char* argv[])
{
  QApplication app(argc, argv);
  YourClass inst;
  inst.show();
  return app.exec();
}

int main(int argc, char* argv[])
{
  QApplication app(argc, argv);
  YourClass inst;
  inst.show();
  return app.exec();
}

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See the doc and Qt demo for the basics.