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Updating statistics

In order to use achievements and leaderboards in Epic Online Services, you need to upload stat data.

Uploading stats to EOS​

To send statistics for a user, use the UpdateStats function on the stats interface:

#include "OnlineSubsystem.h"
#include "OnlineSubsystemUtils.h"
#include "Interfaces/OnlineStatsInterface.h"

// ...

IOnlineSubsystem *Subsystem = Online::GetSubsystem(this->GetWorld());
IOnlineIdentityPtr Identity = Subsystem->GetIdentityInterface();
IOnlineStatsPtr StatsInterface = Subsystem->GetStatsInterface();

FOnlineStatsUserUpdatedStats Stat = FOnlineStatsUserUpdatedStats(Identity->GetUniquePlayerId(0).ToSharedRef());

// For each of the stats to upload, provide the StatName (matching what
// is defined in the Epic Online Services portal) and the int32 value.
// The EOnlineStatModificationType is ignored, as the stat type is defined
// in the portal.
//
// You can add multiple entries to the Stats property to send more than one
// stat value in a single request.
Stat.Stats.Add(StatName, FOnlineStatUpdate(IngestAmount, FOnlineStatUpdate::EOnlineStatModificationType::Unknown));

TArray<FOnlineStatsUserUpdatedStats> Stats;
Stats.Add(Stat);

StatsInterface->UpdateStats(
    Identity->GetUniquePlayerId(0).ToSharedRef(),
    Stats,
    FOnlineStatsUpdateStatsComplete::CreateLambda([](
        const FOnlineError &ResultState)
        {
            // Check `ResultState.bSucceeded`.
        }));