處理事件型統計資料變更

void* context{ nullptr };
XblFunctionContext statisticChangedFunctionContext = XblUserStatisticsAddStatisticChangedHandler(
    xboxLiveContext,
    [](XblStatisticChangeEventArgs eventArgs, void* context) 
    {
        // Handle stat change. 
        LogToScreen("Statistic changed callback: stat changed (%s = %s)",
            eventArgs.latestStatistic.statisticName, 
            eventArgs.latestStatistic.value); 
    },
    context
);

if (statisticChangedFunctionContext == 0)
{
    LogToScreen("XblUserStatisticsAddStatisticChangedHandler failed.");
}

const char* statisticNames[] = { "TotalPuzzlesSolved" };

HRESULT hr = XblUserStatisticsTrackStatistics(
    xboxLiveContext,
    &xboxUserId,
    1,
    scid,
    statisticNames,
    _countof(statisticNames)
);

if (FAILED(hr))
{
    LogToScreen("XblUserStatisticsTrackStatistics failed: 0x%08X", static_cast<unsigned int>(hr));
}

hr = XblUserStatisticsStopTrackingStatistics(
    xboxLiveContext,
    &xboxUserId,
    1,
    scid,
    statisticNames,
    _countof(statisticNames)
);

if (FAILED(hr))
{
    LogToScreen("XblUserStatisticsStopTrackingStatistics failed: 0x%08X", static_cast<unsigned int>(hr));
}

hr = XblUserStatisticsStopTrackingUsers(
    xboxLiveContext,
    &xboxUserId,
    1
);

if (FAILED(hr))
{
    LogToScreen("XblUserStatisticsStopTrackingUsers failed: 0x%08X", static_cast<unsigned int>(hr));
}

XblUserStatisticsRemoveStatisticChangedHandler(
    xboxLiveContext,
    statisticChangedFunctionContext
);