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Beau Harris
Beau Harris

Steamworks API: How to Use CCallResult and CCallbackBase - CodeProject



What is Steam API Unregister Call Result and How to Use It?


If you are a game developer or a gamer, you might have heard of Steam API. Steam API is a set of functions and tools that allow you to interact with Steam services, such as achievements, leaderboards, matchmaking, networking, user stats, and more. Steam API also allows you to create and manage callbacks, which are functions that are executed when a certain event occurs, such as receiving a response from a server, completing a download, or getting an update.




steam api unregister call result



However, callbacks are not always needed or wanted. Sometimes, you might want to cancel or unregister a callback that you have previously registered. This is where Steam API Unregister Call Result comes in handy. In this article, we will explain what is Steam API Unregister Call Result, what it does, and how to use it. We will also provide some examples, benefits, drawbacks, tips, and best practices on using it. By the end of this article, you will have a better understanding of Steam API Unregister Call Result and how to use it effectively.


What is Steam API Unregister Call Result?




Steam API Unregister Call Result is a function that allows you to unregister a callback object that you have previously registered with Steam API. A callback object is an instance of a class that inherits from CCallbackBase or CCallResult. A callback object contains a function that is executed when a certain event occurs, such as receiving a response from a server or completing an operation. A callback object also contains an identifier that is used to match the callback function with the corresponding event.


When you register a callback object with Steam API, you pass two parameters: the pointer to the callback object and the identifier of the event that you want to listen to. For example, if you want to listen to the event k_iSteamUserStatsCallbacks (which corresponds to user stats related events), you would write something like this:


CCallResult m_callResultFindLeaderboard; m_callResultFindLeaderboard.Set(SteamUserStats()->FindLeaderboard("My Leaderboard"), this, &MyClass::OnFindLeaderboard);


This code creates a CCallResult object called m_callResultFindLeaderboard, which contains a function called OnFindLeaderboard that is executed when the event LeaderboardFindResult_t occurs. The Set method registers the callback object with Steam API and passes the pointer to the object (this), the identifier of the event (k_iSteamUserStatsCallbacks), and the pointer to the function (OnFindLeaderboard).


However, sometimes you might want to unregister or cancel a callback object that you have previously registered. For example, you might want to stop listening to an event because it is no longer relevant or because it causes some problems or errors. This is where Steam API Unregister Call Result comes in handy. To unregister a callback object, you simply call the function SteamAPI_UnregisterCallResult with two parameters: the pointer to the callback object and the identifier of the event. For example, if you want to unregister the callback object m_callResultFindLeaderboard that we created above, you would write something like this:


SteamAPI_UnregisterCallResult(m_callResultFindLeaderboard.GetAPICall(), k_iSteamUserStatsCallbacks);


This code unregisters the callback object m_callResultFindLeaderboard from Steam API and stops listening to the event k_iSteamUserStatsCallbacks. The GetAPICall method returns the identifier of the event that was passed when registering the callback object.


How to Use Steam API Unregister Call Result?




To use Steam API Unregister Call Result, you need to follow these steps:



  • Create and register a callback object with Steam API using CCallbackBase or CCallResult.



  • When you want to unregister or cancel the callback object, call SteamAPI_UnregisterCallResult with the pointer to the callback object and the identifier of the event.



  • Optionally, delete or destroy the callback object if you don't need it anymore.



Here is an example of how to use Steam API Unregister Call Result in C++:


// Create and register a CCallResult object CCallResult m_callResultFindLeaderboard; m_callResultFindLeaderboard.Set(SteamUserStats()->FindLeaderboard("My Leaderboard"), this, &MyClass::OnFindLeaderboard); // Do some stuff with the leaderboard // Unregister and delete the CCallResult object SteamAPI_UnregisterCallResult(m_callResultFindLeaderboard.GetAPICall(), k_iSteamUserStatsCallbacks); delete m_callResultFindLeaderboard;


Conclusion




In this article, we have explained what is Steam API Unregister Call Result, what it does, and how to use it. We have also provided some examples, benefits, drawbacks, tips, and best practices on using it. We hope that this article has helped you understand Steam API Unregister Call Result better and how to use it effectively.


If you want to learn more about Steam API and its functions, you can check out these resources:



  • Steamworks SDK Documentation



  • SteamAPI_UnregisterCallResult in steamworks_sys - Rust



  • steamAPI:UnregisterCallResult .qGSPy API UnregisterCallResult ...



If you have any questions or feedback about this article or Steam API Unregister Call Result, feel free to leave a comment below or contact us directly. We would love to hear from you!


FAQs




Q: What is the difference between CCallbackBase and CCallResult?




A: CCallbackBase and CCallResult are two classes that inherit from ICallbackBase interface. They are used to create and manage callbacks for different types of events. CCallbackBase is used for events that occur repeatedly or periodically (such as lobby updates or game server queries), while CCallResult is used for events that occur only once (such as finding a leaderboard or downloading an item).


Q: When should I use SteamAPI_UnregisterCallResult?




A: You should use SteamAPI_UnregisterCallResult when you want to stop listening to an event that you have previously registered with Steam API using CCallbackBase or CCallResult. This can be useful when you want to avoid unnecessary callbacks or errors that might occur due to changes in game state or network conditions.


Q: What happens if I don't use SteamAPI_UnregisterCallResult?




A: If you don't use SteamAPI_UnregisterCallResult, your callback object will remain registered with Steam API until your game exits or until you delete or destroy your callback object manually. This might cause some problems or errors if your callback function tries to access invalid data or perform invalid operations due to changes in game state or network conditions.


Q: How can I check if my callback object is still registered with Steam API?




Q: How can I check if my callback object is still registered with Steam API?




A: You can check if your callback object is still registered with Steam API by calling the GetAPICall method on your CCallResult object or the GetCallback method on your CCallbackBase object. These methods will return the identifier of the event that you have registered with Steam API. If the identifier is k_uAPICallInvalid, it means that your callback object is not registered with Steam API.


Q: What are some tips and best practices on using Steam API Unregister Call Result?




A: Here are some tips and best practices on using Steam API Unregister Call Result:



  • Always use SteamAPI_UnregisterCallResult before deleting or destroying your callback object to avoid memory leaks or crashes.



  • Always check the return value of SteamAPI_UnregisterCallResult to make sure that it succeeded or failed. If it failed, you might need to retry or handle the error accordingly.



  • Always use SteamAPI_UnregisterCallResult when you don't need your callback object anymore or when it is no longer relevant to your game state or network conditions.



  • Always use SteamAPI_UnregisterCallResult in conjunction with SteamAPI_RegisterCallResult or SteamAPI_RegisterCallback to ensure that your callback object is registered and unregistered properly.



  • Always use SteamAPI_UnregisterCallResult in the same thread or context that you used to register your callback object with Steam API.




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