How to Use SteamAPI RestartAppIfNecessary for Your Game
If you are developing a game for Steam, you might want to use the Steamworks API to access various features and services that Steam provides. The Steamworks API allows you to integrate your game with Steam achievements, leaderboards, matchmaking, cloud storage, and more.
However, before you can use the Steamworks API, you need to make sure that your game is launched through Steam. This is because the Steam client provides the implementations of the Steamworks interfaces that your game needs to access. If your game is launched directly from the executable or debugger, the Steamworks API will not initialize properly and you will not be able to use its functions.
Fortunately, there is a simple way to check if your game was launched through Steam and relaunch it through Steam if it wasn't. This is done by using the SteamAPI_RestartAppIfNecessary function. This function takes your game's App ID as a parameter and returns a boolean value indicating whether your game needs to be restarted through Steam or not.
The SteamAPI_RestartAppIfNecessary function works by running the steam://run/ command, which will start the Steam client if it's not running and launch your game from the version installed in your Steam library folder. This means that it may not relaunch the exact executable that called it, so you should make sure that your game is up to date on Steam before using this function.
To use the SteamAPI_RestartAppIfNecessary function, you need to include the steam_api.h header file in your source code and link to the steam_api.lib library file in your project settings. You also need to have a steam_appid.txt file in your game directory next to the executable, with your App ID in it and nothing else. The App ID is a unique number that identifies your game on Steam and can be found on your Steamworks dashboard.
The SteamAPI_RestartAppIfNecessary function should be called as early as possible in your main function, before any other Steamworks API calls. If it returns true, you should exit your process as soon as possible and let Steam relaunch your game. If it returns false, you can proceed with initializing the Steamworks API by calling SteamAPI_Init.
Here is an example of how to use the SteamAPI_RestartAppIfNecessary function in C++:
// Exit the process and let Steam relaunch the game
// Initialize the Steamworks API
// Handle error
// Continue with the rest of your game logic
The SteamAPI_RestartAppIfNecessary function is optional but highly recommended as it allows you to ensure that your game has a valid Steam context and can access all of the features and services that Steam offers. For more information about the Steamworks API and how to use it, please refer to the official documentation[^1^] [^2^] [^3^]. 061ffe29dd