Find Sessions not working on C++ with Steam

Development Platform & Builds
, , , ,
1

Hi, I got a simple matchmaking game that I’m migrating from blueprints to C++, but now I’m stuck at this point:
I cannot find any session from C++, I create the session from C++ then, I try to find games, on blueprints is working well but not on C++, why?

Here is the code (not working):

void UNetGameInstance::FindSessions(TSharedPtr<const FUniqueNetId> UserId, FName SessionName, bool bIsLAN, bool bIsPresence) {
	IOnlineSubsystem* OnlineSub = IOnlineSubsystem::Get();
	if (OnlineSub) {
		IOnlineSessionPtr Sessions = OnlineSub->GetSessionInterface();
		if (Sessions.IsValid() && UserId.IsValid()) {
			SessionSearch = MakeShareable(new FOnlineSessionSearch());
			SessionSearch->bIsLanQuery = bIsLAN;
			SessionSearch->MaxSearchResults = 20;
			SessionSearch->PingBucketSize = 50;

			if (bIsPresence) {
				SessionSearch->QuerySettings.Set(SEARCH_PRESENCE, bIsPresence, EOnlineComparisonOp::Equals);
			}

			const TSharedRef< FOnlineSessionSearch > SearchSettingsRef = SessionSearch.ToSharedRef();

			OnFindSessionsCompleteDelegateHandle = Sessions->AddOnFindSessionsCompleteDelegate_Handle(OnFindSessionsCompleteDelegate);

			Sessions->FindSessions(*UserId, SearchSettingsRef);
			
		}
	} else {
		OnFindSessionsComplete(false);
	}
}

void UNetGameInstance::OnFindSessionsComplete(bool bWasSuccessful) {
	IOnlineSubsystem* const OnlineSub = IOnlineSubsystem::Get();
	if (OnlineSub) {
		IOnlineSessionPtr Sessions = OnlineSub->GetSessionInterface();
		if (Sessions.IsValid()) {
			Sessions->ClearOnFindSessionsCompleteDelegate_Handle(OnFindSessionsCompleteDelegateHandle);
			GEngine->AddOnScreenDebugMessage(-1, 10.f, FColor::White, FString::Printf(TEXT("Num Search Results: %d"), SessionSearch->SearchResults.Num()));
			if (SessionSearch->SearchResults.Num() > 0) {
				for (int32 SearchIdx = 0; SearchIdx < SessionSearch->SearchResults.Num(); SearchIdx++) {
					GEngine->AddOnScreenDebugMessage(-1, 10.f, FColor::White, FString::Printf(TEXT("Session Number: %d | Sessionname: %s "), SearchIdx + 1, *(SessionSearch->SearchResults[SearchIdx].Session.OwningUserName)));
				}
			}
		}
	}
}

And here is the blueprint (working)

70883-online.png
70883-online.png1134×349 74.2 KB

I’m missing something?
Thx :slight_smile:

2

You aren’t checking whether it was successful or not. Secondly, double check that bIsLan is not true, since your Blueprint which works is not using that.

3

I add the check of bWasSuccessful and checked that bIsLan is false and still 0 results from C++ :frowning:

4

By the way, this C++ code is finding properly the sessions without steam, but isn’t able to find any steam session

5

In that case, you must have some mismatch between what the host is registering and what the client is searching for. Dump all of the settings and make sure they match.

6

What values are you calling FindSessions in c++ with?

The default FindSessionsAsyncCallback class (the blueprint version) uses bIsPresence true, make sure that is also set true in your C++ call.

7

For UE4’s default Steam OnlineSubsystem, the Presence flag is used to control whether you are doing a Lobby search or if you’re using the older dedicated server system (not to imply that this is what it SHOULD be used for…)

8

Presence doesn’t matter for searching. Presence just means that session is used for the rich presence string for the player, e.g. “Playing Execution on Gridlock”