Steam Api Unregister Call Result
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How to use Steam API UnregisterCallResult function
The Steam API provides a way for developers to interact with Steam services and features, such as achievements, leaderboards, friends, and more. One of the functions that the Steam API offers is SteamAPI_UnregisterCallResult, which allows you to unregister a callback object that was previously registered with SteamAPI_RegisterCallResult.
A callback object is an instance of a class that inherits from CCallbackBase or CSteamAPICallResult, and implements a function that is called when a certain Steam API call completes. For example, you can use a callback object to handle the result of requesting the user's stats or achievements.
When you register a callback object with SteamAPI_RegisterCallResult, you pass in a SteamAPICall_t handle that identifies the API call you want to monitor. This handle is returned by most of the asynchronous Steam API functions, such as SteamUserStats()->RequestCurrentStats(). You also pass in a pointer to your callback object, which will be stored internally by the Steam API.
When the API call completes, the Steam API will call the function implemented by your callback object, passing in a pointer to a structure that contains the result data. For example, if you registered a callback object for SteamUserStats()->RequestCurrentStats(), your callback function will receive a pointer to a UserStatsReceived_t structure, which contains the user ID and the result code.
After you have processed the result data, you may want to unregister your callback object, so that it is no longer called by the Steam API. This is especially important if you have created your callback object dynamically on the heap, and you want to delete it afterwards. To do this, you can use the SteamAPI_UnregisterCallResult function, which takes the same parameters as SteamAPI_RegisterCallResult: the SteamAPICall_t handle and the pointer to your callback object.
The SteamAPI_UnregisterCallResult function will remove your callback object from the internal list of registered callbacks, and return true if it was successful. If the function returns false, it means that either the handle or the callback object was invalid, or that they did not match any registered pair.
You should always call SteamAPI_UnregisterCallResult before you delete your callback object, or before your program exits. Otherwise, you may cause memory leaks or crashes if the Steam API tries to call a deleted or invalid callback object.
Here is an example of how to use SteamAPI_UnregisterCallResult in C++:
// A class that inherits from CSteamAPICallResult and implements OnRunCallback
class CMyStatsCallback : public CSteamAPICallResult<UserStatsReceived_t>
// Constructor that takes a SteamAPICall_t handle and registers itself
Set(hAPICall, this, &CMyStatsCallback::OnRunCallback);
// Destructor that unregisters itself
// The callback function that is called when the API call completes
void OnRunCallback(UserStatsReceived_t *pResult, bool bIOFailure)
// Check if there was an IO failure
// Handle IO failure
// Check if the result code was OK
if (pResult->m_eResult == k_EResultOK)
// Handle successful result
// Handle error result
// Unregister this callback object
// Somewhere in your code, make an API call and create a callback object
SteamAPICall_t hAPICall = SteamUserStats()-> 061ffe29dd