A Guide to Steam API Unregister Call Result and How It Affects Your Game
What is Steam API Unregister Call Result and Why You Need It
If you are developing a game using Steamworks API, you may have encountered the term Steam API Unregister Call Result. This is a function that allows you to unregister a callback object that you have previously registered to receive a call result from a Steam API function. In this article, we will explain what a call result is, how to use Steam API Unregister Call Result, and what benefits it can bring to your game development.
steam api unregister call result
What is a Call Result?
A call result is a way of getting a response from a Steam API function that performs an asynchronous operation. For example, if you want to request the user's stats from Steam, you can use the ISteamUserStats::RequestUserStats function. This function returns a SteamAPICall_t handle, which is an identifier for the pending operation. You can then register a callback object using the CALL_RESULT macro to receive the result of the operation when it is completed.
A callback object is a class that inherits from CCallbackBase and implements a Run method that takes a parameter of the type of the call result. For example, if you want to receive the result of the ISteamUserStats::RequestUserStats function, you need to create a callback object that inherits from CCallbackBase and implements a Run method that takes a UserStatsReceived_t parameter. You can then pass this callback object and the SteamAPICall_t handle to the CALL_RESULT macro to register it.
How to Use Steam API Unregister Call Result?
Sometimes, you may want to unregister a callback object that you have previously registered to receive a call result. For example, if you have requested the user's stats from Steam, but then the user quits the game before the operation is completed, you may want to unregister the callback object to avoid unnecessary memory usage or potential errors. To do this, you can use the Steam API Unregister Call Result function.
The Steam API Unregister Call Result function takes two parameters: a pointer to the callback object and the SteamAPICall_t handle that identifies the operation. It then removes the association between the callback object and the operation, so that the callback object will not receive the call result when it is available. You can then delete or reuse the callback object as you wish.
The syntax of the Steam API Unregister Call Result function is as follows:
void SteamAPI_UnregisterCallResult(CCallbackBase *pCallback, SteamAPICall_t hAPICall);
An example of using the Steam API Unregister Call Result function is as follows:
// Create a callback object to receive the user's stats
class CUserStatsCallback : public CCallbackBase
public:
void Run(UserStatsReceived_t *pResult)
// Do something with pResult
;
// Request the user's stats from Steam
CUserStatsCallback userStatsCallback;
SteamAPICall_t hUserStatsCall = SteamUserStats()->RequestUserStats(SteamUser()->GetSteamID());
CALL_RESULT(userStatsCallback, UserStatsReceived_t);
// Later, if you want to unregister the callback object
SteamAPI_UnregisterCallResult(&userStatsCallback, hUserStatsCall);
What are the Benefits of Using Steam API Unregister Call Result?
Using Steam API Unregister Call Result can bring several benefits to your game development. Here are some of them:
Better performance: By unregistering callback objects that are no longer needed, you can reduce memory usage and avoid unnecessary processing of call results.
Better error handling: By unregistering callback objects that are no longer valid, you can avoid potential errors or crashes caused by receiving call results for operations that have been canceled or failed.
Better flexibility: By unregistering callback objects that are no longer relevant, you can reuse them for other operations or delete them as you wish.
Conclusion
In this article, we have explained what a call result is, how to use Steam API Unregister Call Result, and what benefits it can bring to your game development. We hope that this article has helped you understand this useful function and how to use it effectively in your game projects.
How to Test Steam API Unregister Call Result?
If you want to test whether Steam API Unregister Call Result works as expected, you can use the SteamAPI_IsAPICallCompleted function. This function takes a SteamAPICall_t handle and a pointer to a boolean variable as parameters. It then checks whether the operation identified by the handle has been completed or not, and sets the boolean variable accordingly. You can then use this variable to determine whether you have received the call result or not.
The syntax of the SteamAPI_IsAPICallCompleted function is as follows:
bool SteamAPI_IsAPICallCompleted(SteamAPICall_t hAPICall, bool *pbFailed);
An example of using the SteamAPI_IsAPICallCompleted function is as follows:
// Request the user's stats from Steam
CUserStatsCallback userStatsCallback;
SteamAPICall_t hUserStatsCall = SteamUserStats()->RequestUserStats(SteamUser()->GetSteamID());
CALL_RESULT(userStatsCallback, UserStatsReceived_t);
// Later, if you want to check whether the operation has been completed
bool bFailed = false;
bool bCompleted = SteamAPI_IsAPICallCompleted(hUserStatsCall, &bFailed);
if (bCompleted)
// The operation has been completed
if (bFailed)
// The operation has failed
else
// The operation has succeeded and you should have received the call result
else
// The operation is still pending
What are the Alternatives to Steam API Unregister Call Result?
If you don't want to use Steam API Unregister Call Result, you have some alternatives to handle call results from Steam API functions. Here are some of them:
Use callbacks instead of call results: Some Steam API functions provide both callbacks and call results as ways of getting a response. For example, if you want to request the user's stats from Steam, you can use either ISteamUserStats::RequestUserStats with a call result or ISteamUserStats::RequestCurrentStats with a callback. Callbacks are classes that inherit from CSteamAPIAsyncCallResult and implement a Run method that takes a parameter of the type of the callback. You can then register a callback using the CALLBACK macro to receive the response when it is available. Callbacks are automatically unregistered when they are deleted or go out of scope.
Use Steamworks.NET instead of Steamworks SDK: If you are developing your game using C# or Unity, you can use Steamworks.NET, which is a wrapper library that provides access to Steamworks API functions and features. Steamworks.NET simplifies the usage of call results by providing delegates and events that you can subscribe to receive the response when it is available. You don't need to worry about registering or unregistering callback objects or handles.
Use Facepunch.Steamworks instead of Steamworks SDK: If you are developing your game using C# or Unity, you can also use Facepunch.Steamworks, which is another wrapper library that provides access to Steamworks API functions and features. Facepunch.Steamworks simplifies the usage of call results by providing async methods that return tasks that you can await or continue with to receive the response when it is available. You don't need to worry about registering or unregistering callback objects or handles.
Conclusion
In this article, we have explained what a call result is, how to use Steam API Unregister Call Result, what benefits it can bring to your game development, how to test it, and what alternatives you have. We hope that this article has helped you understand this useful function and how to use it effectively in your game projects.
How to Use Steam API Unregister Call Result with Other Steamworks Features?
Besides using Steam API Unregister Call Result with Steam User Stats, you can also use it with other Steamworks features that provide call results. Here are some examples:
Steam Remote Storage: This feature allows you to store and retrieve files on Steam Cloud. You can use the ISteamRemoteStorage::FileWriteAsync function to write a file to Steam Cloud asynchronously. This function returns a SteamAPICall_t handle and provides a RemoteStorageFileWriteAsyncComplete_t call result. You can then use Steam API Unregister Call Result to unregister the callback object that receives the call result if you don't need it anymore.
Steam UGC: This feature allows you to create and manage user-generated content (UGC) on Steam. You can use the ISteamUGC::CreateItem function to create a new UGC item asynchronously. This function returns a SteamAPICall_t handle and provides a CreateItemResult_t call result. You can then use Steam API Unregister Call Result to unregister the callback object that receives the call result if you don't need it anymore.
Steam Inventory: This feature allows you to create and manage virtual items on Steam. You can use the ISteamInventory::GenerateItems function to generate new items for a user asynchronously. This function returns a SteamAPICall_t handle and provides a SteamInventoryResultReady_t call result. You can then use Steam API Unregister Call Result to unregister the callback object that receives the call result if you don't need it anymore.
Frequently Asked Questions about Steam API Unregister Call Result
In this section, we will answer some of the most common questions that users have about Steam API Unregister Call Result. If you have any other questions, feel free to ask them in the comments below.
Q: When should I use Steam API Unregister Call Result?
A: You should use Steam API Unregister Call Result when you want to unregister a callback object that you have previously registered to receive a call result from a Steam API function. This can help you improve performance, error handling, and flexibility in your game development.
Q: How do I know if I have received a call result or not?
A: You can use the SteamAPI_IsAPICallCompleted function to check whether an operation identified by a SteamAPICall_t handle has been completed or not, and whether it has failed or succeeded. You can also use the bFailed parameter of the CUserStatsCallback::Run method or the m_eResult member of the call result structure to check whether an operation has failed or succeeded.
Q: What happens if I don't use Steam API Unregister Call Result?
A: If you don't use Steam API Unregister Call Result, you may encounter some problems or errors in your game development. For example, you may waste memory or processing resources by keeping callback objects that are no longer needed. You may also receive call results for operations that have been canceled or failed, which may cause errors or crashes in your game.
Conclusion
In this article, we have explained what a call result is, how to use Steam API Unregister Call Result, what benefits it can bring to your game development, how to test it, what alternatives you have, and how to use it with other Steamworks features. We have also answered some of the most common questions that users have about Steam API Unregister Call Result. We hope that this article has helped you understand this useful function and how to use it effectively in your game projects.
If you have any feedback or suggestions for this article, please let us know in the comments below. If you want to learn more about Steamworks API and how to use it in your game development, you can check out the official documentation and the Steamworks SDK. You can also join the Steamworks Development community and the Steamworks.NET Discord server to get help and support from other developers. Thank you for reading and happy coding! 4e3182286b
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