How to Use SteamAPI Registercallresult to Handle Callbacks in Steamworks
If you are developing a game using Steamworks, you may need to use callbacks to receive notifications from the Steam client. Callbacks are functions that are executed when a certain event occurs, such as a user logging in, a friend request being sent, or an achievement being unlocked. However, callbacks can be tricky to handle correctly, especially if you are using multiple threads or asynchronous operations. That's where SteamAPI Registercallresult comes in handy.
steamapiregistercallresult
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SteamAPI Registercallresult is a function that allows you to register a callback handler for a specific Steam API call result. A call result is a type of callback that is triggered when an API call returns a value, such as SteamUser()->RequestEncryptedAppTicket(). A call result handler is a class that inherits from CCallResult and implements a Run function that takes the call result type as a parameter. For example:
class CMyEncryptedAppTicketHandler : public CCallResult<CSteamID, EncryptedAppTicketResponse_t>
public:
void Run(EncryptedAppTicketResponse_t *pEncryptedAppTicketResponse, bool bIOFailure, SteamAPICall_t hSteamAPICall)
// Handle the encrypted app ticket response here
;
To use SteamAPI Registercallresult, you need to create an instance of your call result handler class and pass it to the function along with the API call handle that you want to register it for. For example:
CMyEncryptedAppTicketHandler g_MyEncryptedAppTicketHandler;
SteamAPICall_t hEncryptedAppTicketCall = SteamUser()->RequestEncryptedAppTicket();
SteamAPI_RegisterCallResult(&g_MyEncryptedAppTicketHandler, hEncryptedAppTicketCall);
This way, when the API call returns a value, the Run function of your call result handler will be executed automatically. You don't need to poll for the callback manually or worry about thread synchronization issues. SteamAPI Registercallresult also takes care of unregistering the call result handler when it is no longer needed.
SteamAPI Registercallresult is a useful function that can simplify your code and make it easier to handle callbacks in Steamworks. However, you should be careful not to use it for API calls that return multiple values or fire multiple times, such as SteamMatchmaking()->RequestLobbyList(). In those cases, you should use SteamAPI_RegisterCallback instead.
In this article, we have learned how to use SteamAPI Registercallresult to handle call results in Steamworks. Call results are callbacks that are triggered when an API call returns a value. SteamAPI Registercallresult allows you to register a call result handler class that inherits from CCallResult and implements a Run function that takes the call result type as a parameter. This way, you can handle the call result in a simple and elegant way.
However, SteamAPI Registercallresult is not suitable for all types of callbacks. Some callbacks are not call results, but rather events that can occur at any time, such as SteamFriends()->SetPersonaNameResponse(). These callbacks do not return a value, but rather a structure that contains information about the event. To handle these callbacks, you need to use SteamAPI_RegisterCallback instead.
SteamAPI_RegisterCallback is a function that allows you to register a callback handler for a specific callback type. A callback handler is a class that inherits from CCallback and implements a Run function that takes the callback type as a parameter. For example:
class CMyPersonaNameHandler : public CCallback<CSteamID, SetPersonaNameResponse_t>
public:
void Run(SetPersonaNameResponse_t *pSetPersonaNameResponse)
// Handle the persona name response here
;
To use SteamAPI_RegisterCallback, you need to create an instance of your callback handler class and pass it to the function along with the callback type that you want to register it for. For example:
CMyPersonaNameHandler g_MyPersonaNameHandler;
SteamAPI_RegisterCallback(&g_MyPersonaNameHandler, k_iSteamFriendsCallbacks + 2);
This way, when the callback is fired, the Run function of your callback handler will be executed automatically. You don't need to poll for the callback manually or worry about thread synchronization issues. SteamAPI_RegisterCallback also takes care of unregistering the callback handler when it is no longer needed.
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