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UE Steam Framework

A full Steamworks SDK integration for Unreal Engine 5.6 built on Game Instance Subsystems.

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Features

• Lobby system — create, join, leave, search with filters, metadata, member management, chat, and friend invites
• Friends — friends list, avatars, persona state, Steam overlay control, game invites, rich presence
• Stats & Achievements — read/write integer and float stats, unlock/clear achievements, global unlock percentages
• Inventory — item instances, item definitions, consume, promo grants, playtime drops
• Cloud Saves — read/write files and strings to Steam Remote Storage with quota info
• Workshop / UGC — query, subscribe/unsubscribe, and check install state of Workshop items
• P2P Networking — send/receive packets over Steam's relay network on multiple channels
• Project Settings panel — App ID, ownership enforcement, and server config in Editor UI

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Requirements

Engine	Unreal Engine 5.6
Platform	Windows (tested), Linux/macOS should work with Steam SDK support
Steam	Steam must be running; steam_appid.txt required next to the executable

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Installation

1. Copy the Plugins/UESteamFramework folder into your project's Plugins/ directory.
2. Add the plugin to your .uproject:

   { "Name": "UESteamFramework", "Enabled": true }

3. In Edit → Project Settings → Plugins → Steam Framework set your App ID (use 480 for development with Spacewar).
4. Ensure DefaultEngine.ini has:

   [OnlineSubsystem]
   DefaultPlatformService=Steam
   
   [OnlineSubsystemSteam]
   bEnabled=true
   SteamDevAppId=480

5. Place steam_appid.txt containing your App ID in the project root (for PIE) or next to the packaged executable.

No custom Game Instance class is required.

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Usage

Every subsystem is accessed the same way in Blueprint or C++:

Blueprint:

Get Game Instance → Get Subsystem (pick the subsystem class)

C++:

#include "SteamLobbySubsystem.h"

USteamLobbySubsystem* Lobby = GetGameInstance()->GetSubsystem<USteamLobbySubsystem>();

Example — create a lobby

FLobbyCreateParams Params;
Params.LobbyName  = TEXT("My Lobby");
Params.MaxPlayers = 4;
Params.Visibility = ELobbyVisibility::Public;

Lobby->OnLobbyCreated.AddDynamic(this, &AMyClass::HandleLobbyCreated);
Lobby->CreateLobby(Params);

Example — unlock an achievement

USteamAchievementsSubsystem* Ach = GetGameInstance()->GetSubsystem<USteamAchievementsSubsystem>();
Ach->SetAchievement(TEXT("ACH_WIN_ONE_GAME"));
Ach->StoreStats();

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Subsystems

Subsystem	Steam API	Highlights
USteamCoreSubsystem	ISteamUser, ISteamUtils, ISteamApps	Init/shutdown, RunCallbacks tick, avatars, rich presence
USteamFriendsSubsystem	ISteamFriends	Friends list, overlay, invites
USteamLobbySubsystem	ISteamMatchmaking	Full lobby lifecycle + search
USteamAchievementsSubsystem	ISteamUserStats	Stats, achievements, leaderboards
USteamInventorySubsystem	ISteamInventory	Items, definitions, drops
USteamRemoteStorageSubsystem	ISteamRemoteStorage	Cloud file I/O
USteamUGCSubsystem	ISteamUGC	Workshop query and subscriptions
USteamNetworkingSubsystem	ISteamNetworking	P2P packet send/receive

Full API reference: API-Reference

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Project Structure

Plugins/UESteamFramework/
  Source/UESteamFramework/
    Public/
      SteamTypes.h                   — shared structs and enums
      SteamSettings.h                — Project Settings config object
      SteamCoreSubsystem.h
      SteamFriendsSubsystem.h
      SteamLobbySubsystem.h
      SteamAchievementsSubsystem.h
      SteamInventorySubsystem.h
      SteamRemoteStorageSubsystem.h
      SteamUGCSubsystem.h
      SteamNetworkingSubsystem.h
    Private/
      SteamSDK.h                     — internal Steam include + texture helper
      (implementations)
  DOCUMENTATION.md                   — full API reference

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License

Copyright © Marc Fraedrich. See LICENSE for details.