4.8 Transition Guide

[Rama]

@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,

You can clear any previous use of the delegate, before using it again, using code similar to this:

IOnlineSubsystem* OnlineSub = IOnlineSubsystem::Get();
if (OnlineSub)
{
	IOnlineSessionPtr Sessions = OnlineSub->GetSessionInterface();
	Sessions->**ClearOnStartSessionCompleteDelegate_Handle**(OnStartSessionCompleteDelegateHandle);
}

And the create your new use of the delegate afterward.

Good luck!