HRESULT XStoreQueryPackageUpdatesAsync (   
         const XStoreContextHandle storeContextHandle,    
         const char** packageIdentifiers,   
         size_t packageIdentifiersCount,   
         XAsyncBlock* async   

)   

void CALLBACK QueryPackageUpdatesCallback(XAsyncBlock* asyncBlock)
{
    uint32_t count;

    HRESULT hr = XStoreQueryPackageUpdatesResultCount(
        asyncBlock,
        &count);

    if (FAILED(hr))
    {
        printf("XStoreQueryPackageUpdatesResultCount failed : 0x%x\n", hr);
        return;
    }

    printf("Number of updates: %d", count);

    if (count > 0)
    {
        XStorePackageUpdate* updates = new XStorePackageUpdate[count];
        hr = XStoreQueryPackageUpdatesResult(
            asyncBlock,
            count,
            updates);

        if (FAILED(hr))
        {
            delete[] updates;
            printf("XStoreQueryPackageUpdatesResult failed: 0x%x\n", hr);
            return;
        }

        for (uint32_t index = 0; index < count; index++)
        {
            printf("Update found for packageIdentifier: %s\n", updates[index].packageIdentifier);

            // Proceed to XStoreDownloadAndInstallPackageUpdates flow
        }

        delete[] updates;
    }
}

void QueryPackageUpdates(XStoreContextHandle storeContextHandle, XTaskQueueHandle taskQueueHandle)
{
    std::vector<std::string> packageIds;

    HRESULT hr = XPackageEnumeratePackages(
        XPackageKind::Game,
        XPackageEnumerationScope::ThisAndRelated,
        &packageIds, [](void* context, const XPackageDetails* details) -> bool
        {
            auto packageIds = reinterpret_cast<std::vector<std::string>*>(context);

            printf("Identifier: %s name: %s\n", details->packageIdentifier, details->displayName);
            packageIds->push_back(details->packageIdentifier);
        });

    // packageIds now populated with ids for all installed packages

    auto asyncBlock = new XAsyncBlock();
    asyncBlock->queue = m_asyncQueue;
    asyncBlock->callback = QueryPackageUpdatesCallback;

    hr = XStoreQueryPackageUpdatesAsync(
        m_storeContext,
        packageIds.data(),
        packageIds.size(),
        asyncBlock);

    if (FAILED(hr))
    {
        printf("XStoreQueryPackageUpdatesAsync failed: 0x%x\n", hr);
        return;
    }
}