{steamAPI Registercallresult} 1

{steamAPI Registercallresult} 1

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How to use SteamAPI_RegisterCallResult to handle Steam callbacks

Steamworks API is a powerful tool that allows you to integrate your game with Steam features and services, such as achievements, leaderboards, matchmaking, user authentication, and more. However, using the Steamworks API can be challenging, especially when it comes to handling asynchronous callbacks from Steam.

Callbacks are functions that are executed when a certain event occurs, such as receiving a response from a Steam server, completing an achievement, or joining a lobby. Callbacks are useful because they allow you to react to events without blocking your main game loop. However, callbacks also introduce some complexity and potential pitfalls, such as:

Callbacks can be executed at any time, even when you are not expecting them.

Callbacks can be executed in a different thread than your main game loop, which can cause concurrency issues.

Callbacks can be executed multiple times for the same event, which can cause unexpected behavior.

Callbacks can be executed after you have already cleaned up or deleted the objects that they refer to, which can cause memory errors.

To avoid these problems, you need to manage your callbacks carefully and ensure that they are executed only when and where you want them to. One way to do this is to use the SteamAPI_RegisterCallResult function.

What is SteamAPI_RegisterCallResult

SteamAPI_RegisterCallResult is a function that allows you to associate a callback function with a specific Steam call handle. A Steam call handle is a unique identifier that is returned by some Steamworks API functions that perform asynchronous operations. For example, when you call ISteamUserStats::RequestUserStats to request the statistics of a user, it returns a SteamAPICall_t handle that represents that operation.

By using SteamAPI_RegisterCallResult, you can specify which callback function should be executed when that operation completes. For example, you can register a callback function that will process the user statistics when they are received from Steam. The advantage of this approach is that you can control which callback function is executed for each operation, and avoid unwanted or duplicate callbacks.

How to use SteamAPI_RegisterCallResult

To use SteamAPI_RegisterCallResult, you need to follow these steps:

Create a callback class that inherits from CCallbackBase and implements the Run and GetCallbackSizeBytes methods. The Run method should contain the logic that you want to execute when the callback is triggered. The GetCallbackSizeBytes method should return the size of the callback structure in bytes.

Create an instance of your callback class and pass it as the first argument to SteamAPI_RegisterCallResult. The second argument should be the Steam call handle that you want to associate with the callback.

When the operation represented by the Steam call handle completes, your callback function will be executed with the appropriate parameters.

When you no longer need the callback, you should call SteamAPI_UnregisterCallResult to unregister it and free up resources.

Here is an example of how to use SteamAPI_RegisterCallResult in C++:

```cpp

// Define a callback class that inherits from CCallbackBase

class UserStatsReceivedCallback : public CCallbackBase

{

public:

// Define a constructor that takes a pointer to an object that will handle the callback

UserStatsReceivedCallback(MyGame *pGame) : m_pGame(pGame) {}

// Override the Run method to implement the callback logic

virtual void Run(void *pvParam)

{

// Cast the parameter to the appropriate callback structure type

UserStatsReceived_t *pCallback = (UserStatsReceived_t *)pvParam;

// Check if the operation was successful and if the user ID matches

if (pCallback->m_eResult == k_EResultOK && pCallback->m_nGameID == m_pGame->GetAppID())

{

// Process the user statistics

m_pGame->OnUserStatsReceived(pCallback->m_nGameID);

}

}

// Override the GetCallbackSizeBytes method to return the size of the callback structure

virtual int GetCallbackSizeBytes()

{

return sizeof(UserStatsReceived_t);

}

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