Sign game users in

Signing in follows the same protocol as signing up, just with different parameters.

There is a callback function to let you know if your sign-in has been successful or not. Email and password, not the username, will be used to sign in.

Example

void UMyObject::SignIn(const FString& Email, const FString& Password)
{
    // Get the GameFuse User subsystem
    UGameFuseUser* GameFuseUser = GetGameInstance()->GetSubsystem<UGameFuseUser>();

    // Create a typed callback for better type safety
    FGFUserDataCallback CompletionCallback;
    CompletionCallback.BindLambda([this](bool bSuccess, const FGFUserData& UserData)
    {
        if(bSuccess)
        {
            UE_LOG(LogTemp, Display, TEXT("User signed in successfully"));
            UE_LOG(LogTemp, Display, TEXT("Username: %s"), *UserData.Username);
            UE_LOG(LogTemp, Display, TEXT("User ID: %d"), UserData.Id);
            UE_LOG(LogTemp, Display, TEXT("Score: %d"), UserData.Score);
            UE_LOG(LogTemp, Display, TEXT("Credits: %d"), UserData.Credits);
        }
        else
        {
            UE_LOG(LogTemp, Error, TEXT("Sign in failed"));
        }
    });

    // Sign in the user
    GameFuseUser->SignIn(Email, Password, CompletionCallback);
}

Checking Sign In Status

You can check if a user is currently signed in:

UGameFuseUser* GameFuseUser = GetGameInstance()->GetSubsystem<UGameFuseUser>();
if (GameFuseUser->IsSignedIn())
{
    UE_LOG(LogTemp, Display, TEXT("User is signed in"));
    FString Username = GameFuseUser->GetUsername();
    UE_LOG(LogTemp, Display, TEXT("Current user: %s"), *Username);
}

Accessing User Data: Current vs. Last Fetched

After signing in, you can access user data using two functions:

• GetCurrentUserData(): Returns the currently signed-in user's data. This is updated after a successful sign-in or sign-up, and is what you should use for the local player.
• GetLastFetchedUserData(): Returns the most recently fetched user (for example, after calling FetchUser(UserId, Callback)). This is useful for viewing other users' profiles or data.

Example:

UGameFuseUser* GameFuseUser = GetGameInstance()->GetSubsystem<UGameFuseUser>();
const FGFUserData& MyUser = GameFuseUser->GetCurrentUserData(); // Local signed-in user
const FGFUserData& OtherUser = GameFuseUser->GetLastFetchedUserData(); // Last user fetched by ID

• After sign-in, GetCurrentUserData() is updated with the signed-in user.
• After calling FetchUser(UserId, Callback), GetLastFetchedUserData() is updated with that user's data.

Function Parameters

GameFuseUser->SignIn

Parameter	Type	Description
Email	FString	The user's email address
Password	FString	The user's password
Callback	FGFUserDataCallback	Callback function to handle the response

Response Handling

The FGFUserDataCallback provides direct access to the user data: - bool bSuccess: Whether the sign in was successful - const FGFUserData& UserData: The user data if successful

Function return values

GameFuseUser->SignIn

HTTP status code	Description
200	OK - User signed in successfully
401	Unauthorized - Incorrect email or password
402	Game is disabled (check the GameFuse dashboard)
404	User not found
500	Unknown server error