4.8 Transition Guide

[Elvince]

@Elvince;312131

Hi,

I have an issue with
void AGameSession::HandleMatchHasStarted() :
StartSessionCompleteHandle = SessionInt->AddOnStartSessionCompleteDelegate_Handle(FOnStartSessionCompleteDelegate::CreateUObject(this, &AGameSession::OnStartSessionComplete));

If I call twice:
void AGameMode::HandleMatchHasStarted()
{
GameSession->HandleMatchHasStarted();

It crash on
check(!DelegateInstanceInterface->IsSameFunction(InDelegateInstance)); (in C:\Unreal Engine\4.8\Engine\Source\Runtime\Core\Public\Delegates\DelegateSignatureImpl_Variadics inside FDelegateHandle AddDelegateInstance( TDelegateInstanceInterface InDelegateInstance ))

It seems that the 2 delegate are not the same.

I have no clue what’s the issue . From what I’m understanding, the Delegate is created Twice on the same function, but it should not be an issue. in 4.7, it was not. Does someone is aware of a change on the delegate management?

Thanks,

For this issue, I didn’t find the root cause. Maybe my SessionInterface implementation that is still WIP.
In all cases, the cause of this change is due to : https://github.com/EpicGames/UnrealEngine/commit/79e183780fb912ba059d04148260fc404fc83b65
This commit has been pushed into 4.8, I checked the release notes and nothing has been mentionned on this.
So be aware that if you are connected to a OnlineServices, now HandleMatchHasStarted & HandleMatchHasEnded are now implemented in the Engine code and that it’s using your OnlineServices Session Interface to start and end your Session.

Thanks,

[Edit]
So you know I also opened a case to get the DelegateHandle as protected and not private. Otherwise you can’t manage them.
You can overrive the functin, but you can’t use the DelegateHandle.