How can I catch alt f4 key in ue5?

[JoostDev]

According to this post, it can be done:

Catching/Blocking Alt+f4 in Packaged Game

Actually you can also handle window close requests in user code, without ever touching the engine source. The viewport client does have a delegate for exactly that purpose, which can be obtained by the UGameViewportClient::OnWindowCloseRequested() accessor. The world viewport client can be obtained with the UGameInstance::GetGameViewportClient() method, but beware that this is only available after the GameInstance has been initialized, but not yet in the UGameInstance::Init() method. So, as c…