void CALLBACK XGameActivationCallback(  
         void* context,  
         const XGameActivationInfo* activationInfo  
)  

#include <XTaskQueue.h>
#include <XGameActivation.h>

XTaskQueueHandle g_taskQueue;
XTaskQueueRegistrationToken g_activationToken;

void CALLBACK OnActivation(void* context, const XGameActivationInfo* activationInfo)
{
    switch (activationInfo->type)
    {
    case XGameActivationType::Protocol:
        // Perform your game action based on activationInfo->protocolUri
        HandleProtocolActivation(activationInfo->protocolUri);
        return;

    case XGameActivationType::File:
        // e.g. Load the game file; activationInfo->file
        HandleFileActivation(activationInfo->file);
        return;

    case XGameActivationType::PendingGameInvite:
        // Game has received a game invite. Handle it by giving the user the option to
        // accept or reject the invite via UI.
        {
            bool userAcceptsInvite = HandlePendingGameInviteWithUI(activationInfo->inviteUri);
            if (userAcceptsInvite)
            {
                XGameActivationAcceptPendingInvite(activationInfo->inviteUri);
            }
        }
        return;

    case XGameActivationType::AcceptedGameInvite:
        // e.g. Join the game session that we are invited to
        HandleGameInvite(activationInfo->inviteUri);
        return;

    default:
        // Other unknown activation types. Just ignore.
        return;
    }
}

void InitializeGame()
{
    XGameActivationRegisterForEvent(g_taskQueue, nullptr, OnActivation, &g_activationToken);
}

void ShutdownGame()
{
    XGameActivationUnregisterForEvent(g_activationToken, true);
}