OnJoinSessionCompleteResult always returning '0' for Success when not true

Development Programming & Scripting Multiplayer & Networking
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1

void UMyGameInstance::OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result)
{
GEngine->AddOnScreenDebugMessage(-1, 10.f, FColor::Yellow, FString::Printf(TEXT(“OnJoinSessionComplete %s, %d”), *SessionName.ToString(), static_cast(Result)));

The OnJoinSessionComplete callback function seems to return a ‘Success’ all the time.

I’ve tested it over LAN, not over Steam yet, but it seems to be the case over LAN. The Use Case I’ve tested is:

  1. Client A hosts a Session over LAN.
  2. Client B searches for sessions and finds Client A’s Session.
  3. Client A leaves Session, and Session is destroyed.
  4. Client B tries to join Client A’s session which is now destroyed.
  5. OnJoinSessionComplete callback returns with ‘Success’

This is obviously an issue since I need a correct callback to adjust game flow and redirect menus and all that.

2

Tested over Steam. Steam join callbacks are correct, this seems to be an issue over LAN.

3

Do used OnlineSubsystemNull or you trying to make LAN game using OnlineSubsystemSteam? Keep in mind Null is just a dummy, there is no online service behind him it just to make a game that is made for online servers could work without any online service implemented

4

I used Steam with the -nosteam command argument to test multiplayer locally to make the LAN game. I think a failed JoinSession should still return at least an “Unknown” if it fails whatsoever.