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Issues trying to include online session types in GameSession.cpp

I've been trying to change the following function in GameSession.cpp

 void AGameSession::RegisterServer()


 void AGameSession::RegisterServer()
     UWorld* World = GetWorld();
     IOnlineSessionPtr SessionInt = Online::GetSessionInterface(World);

     FOnlineSessionSettings Settings;
     Settings.NumPublicConnections = 42;
     Settings.bShouldAdvertise = true;
     Settings.bAllowJoinInProgress = true;
     Settings.bIsLANMatch = false;
     Settings.bUsesPresence = true;
     Settings.bAllowJoinViaPresence = true;
     SessionInt->CreateSession(0, GameSessionName, Settings);

However, I get 28 errors related to undeclared identifiers, such as:

 'IOnlineSessionPtr': undeclared identifier
 'SessionInt': undeclared identifier
 'FOnlineSessionSettings': undeclared identifier

I assume this is because I need to #include some headers to access online types and functions. However, #including "Online.h" and "OnlineSubsystemUtils.h" came up with errors claiming that they could not be found, and #including their absolute filepaths ended up giving 99 errors.

Any advice?

PS. both the header files are in the /Plugins folder and not the /Runtime folder. Is that important?

Product Version: UE 4.15
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asked Jul 14 '17 at 03:52 AM in C++ Programming

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21 1 2

avatar image Vawx Jul 14 '17 at 04:12 AM

Have you added "OnlineSubsystem" to your MYPROJECT.Build.cs file?

         PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "OnlineSubsystem" });
avatar image badineen Jul 14 '17 at 04:16 AM

Yes, OnlineSubsystem is in there:

 PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "AdvancedSessions", "VRExpansionPlugin", "OnlineSubsystem", "OnlineSubsystemSteam", "OnlineSubsystemUtils" });
 PrivateDependencyModuleNames.AddRange(new string[] {  });

avatar image Vawx Jul 14 '17 at 04:21 AM

How about?:

 #include "UnrealNetwork.h"

(alongside Online.h)

avatar image badineen Jul 14 '17 at 04:24 AM

The MYPROJECT.h file has

 #include "UnrealNetwork.h"
 #include "Online.h"

Is that the right place to put them?

avatar image Vawx Jul 14 '17 at 04:26 AM

For 4.15, that is probably fine as long as you are including your MYPROJECT.h file in your GameSession.cpp file.

This is the only reference I have used for game sessions and I haven't used in months:


I do know that when I used it, it was fine. Probably somewhere around 4.13 - 4.14.

avatar image badineen Jul 14 '17 at 07:06 AM

Error might be because I am trying to access a plugin's file from inside the engine source code. I assume that is the issue.

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