Steam

Steam tells you whether Steam is working and who the local player and their friends are. Text in brackets at the end of a note is extra detail for experienced modders, and you can skip it on a first read.

A few words used on this page. A SteamID64 is the long number that identifies one Steam account. A peer is another player in your lobby whom the framework has checked and accepts. A handler is the piece of your code that the framework runs when something arrives.

Steam Steam status and friends

Check IsReady first, since hosting and joining a lobby do not work until it is true. Name(steamId) and FriendsPlaying(appId) give you the names and friends to show.

public static class Steam
{
    public static bool IsReady { get; }
    public static ulong LocalId { get; }
    public static bool OverlayEnabled { get; }
    public static string Name(ulong steamId);
    public static List<ulong> FriendsPlaying(uint appId);
}

Method	Returns	What it does
`Name(steamId)`	`string`	A player’s Steam name. `""` when unknown or not ready.
`FriendsPlaying(appId)`	`List<ulong>`	Friends who are playing this game right now.

Property	Type	What it means
`IsReady`	`bool`	`true` when Steam is running and the game has started it.
`LocalId`	`ulong`	The local player’s SteamID64. `0` when Steam is not ready.
`OverlayEnabled`	`bool`	`true` when the Steam overlay can show. `false` when Steam is not ready.

Things to know

IsReady tells you whether Steam is up. (It reads the private m_bInitialized of the game’s SteamManager through reflection. It does not use SteamManager.Initialized, because that getter creates a SteamManager object when none exists. It is checked at most once per second until it is true.)
OverlayEnabled lets you tell the player why an invite can’t show. It is false when Steam is not ready or the overlay is turned off.
FriendsPlaying(appId) lists your friends who are in a game right now. Use 951240 for Obenseuer. It only looks at the player’s own friends.

Limits

Until IsReady is true, hosting and joining a lobby do not work.
Name can be empty at first, so ask again on a later frame. For someone who is not your friend, Steam may not know the name yet. The first call asks Steam for it and returns "", and the name arrives a moment later. The text is cleaned the same way as the other text from other players (see “Presence”). (It calls SteamFriends.RequestUserInformation(id, true) when Steam reports the name as empty or [unknown].)