SFML and Qt

[Laurent]

It was not stupid, it's also a good strategy to assume that everything may throw, and make all your code exception-safe. In this case you can do this:

window.clear();
{
    sf::Lock lock(m_mutex);
    window.draw(sprite);
}
window.display();

[Foaly]

Ah ok. That is a good idea. I'll try that later. Thanks again for all the help.