How is FindFriendSession in OnlineSubsystemEOS supposed to work?

Development Programming & Scripting Multiplayer & Networking
,
1

Just when I thought OnlineSubsystemEOS can’t get any worse with half of the interface methods not implemented, someone decided to implement FindFriendSession (“only for lobbies”).

He did a good search which is working (I suppose) and finding lobbies. Then this man calls a delegate with 1 parameter: whether the search was successful or not.

Thank you, this is a very important information indeed. How do I access the search results though? And why TriggerOnFindFriendSessionCompleteDelegates couldn’t be called?

image
image1550×766 120 KB

2

Correct code:

bool FOnlineSessionEOS::FindFriendSession(int32 LocalUserNum, const FUniqueNetId& Friend)
{
	bool bResult = false;

	// So far there is only a lobby implementation for this

	// We create the search handle
	EOS_HLobbySearch LobbySearchHandle;
	EOS_Lobby_CreateLobbySearchOptions CreateLobbySearchOptions = { 0 };
	CreateLobbySearchOptions.ApiVersion = EOS_LOBBY_CREATELOBBYSEARCH_API_LATEST;
	CreateLobbySearchOptions.MaxResults = EOS_SESSIONS_MAX_SEARCH_RESULTS;

	EOS_EResult CreateLobbySearchResult = EOS_Lobby_CreateLobbySearch(LobbyHandle, &CreateLobbySearchOptions, &LobbySearchHandle);
	if (CreateLobbySearchResult == EOS_EResult::EOS_Success)
	{
		const FUniqueNetIdEOS& FriendEOSId = FUniqueNetIdEOS::Cast(Friend);

		// Set the user we wan to use to find lobbies
		EOS_LobbySearch_SetTargetUserIdOptions SetTargetUserIdOptions = { 0 };
		SetTargetUserIdOptions.ApiVersion = EOS_LOBBYSEARCH_SETTARGETUSERID_API_LATEST;
		SetTargetUserIdOptions.TargetUserId = FriendEOSId.GetProductUserId();

		// TODO: Using this as a search parameter only works if we use the owner's id (search for lobbies we're already in). Pending API fix so it works with other users too.
		EOS_LobbySearch_SetTargetUserId(LobbySearchHandle, &SetTargetUserIdOptions);

		// Then perform the search
		CurrentSessionSearch = MakeShareable(new FOnlineSessionSearch());
		CurrentSessionSearch->SearchState = EOnlineAsyncTaskState::InProgress;

		StartLobbySearch(LocalUserNum, LobbySearchHandle, CurrentSessionSearch.ToSharedRef(), FOnSingleSessionResultCompleteDelegate::CreateLambda([this](int32 LocalUserNum, bool bWasSuccessful, const FOnlineSessionSearchResult& EOSResult)
		{
			TriggerOnFindFriendSessionCompleteDelegates(LocalUserNum, bWasSuccessful, {EOSResult});
		}));

		bResult = true;
	}
	else
	{
		UE_LOG_ONLINE_SESSION(Warning, TEXT("[FOnlineSessionEOS::FindFriendSession] CreateLobbySearch not successful. Finished with EOS_EResult %s"), ANSI_TO_TCHAR(EOS_EResult_ToString(CreateLobbySearchResult)));
		EOSSubsystem->ExecuteNextTick([this, LocalUserNum]()
		{
			TriggerOnFindFriendSessionCompleteDelegates(LocalUserNum, false, {});
		});
	}

	return bResult;
};