XGameStreamingRegisterClientPropertiesChanged

บทความ
06/22/2023

Registers a callback to be invoked when any streaming client device's properties change.

Note

Upon registration, the callback will be invoked for the client device's current client properties.

Syntax

HRESULT XGameStreamingRegisterClientPropertiesChanged(  
         XGameStreamingClientId client,  
         XTaskQueueHandle queue,  
         void* context,  
         XGameStreamingClientPropertiesChangedCallback* callback,  
         XTaskQueueRegistrationToken* token  
)

Parameters

client _In_
Type: XGameStreamingClientId

ID of the game streaming client that you are registering to get callbacks for.

queue _In_opt_
Type: XTaskQueueHandle

Handle to the asynchronous queue to put the change callback on.

context _In_opt_
Type: void*

An optional pointer to a context that will be passed to the callback function.

callback _In_
Type: XGameStreamingClientPropertiesChangedCallback*

The callback function that will be invoked when the properties of the client change.

token _Out_
Type: XTaskQueueRegistrationToken*

A pointer to the registration token which can be used to unregister from the event.

Return value

Type: HRESULT

Returns S_OK if successful; otherwise, returns an error code.

Potential Errors

Error Code	Error Value	Reason for Error
E_GAMESTREAMING_NOT_INITIALIZED	0x89245400	The XGameStreaming runtime has not been initialized. Call XGameStreamingInitialize before calling other APIs.
E_GAMESTREAMING_CLIENT_NOT_CONNECTED	0x89245401	The specified client is not connected.

For a list of error codes, see Error Codes.

Remarks

Note

This function isn't safe to call on a time-sensitive thread. For more information, see Time-sensitive threads.

This API allows the game to receive a XGameStreamingClientPropertiesChangedCallback whenever a XGameStreamingClientProperty, like stream physical dimensions, changes.

Registration WILL cause the callback to invoked with all applicable XGameStreamingClientProperty, so that querying for current property details can be done.

When the streaming client device disconnects, please use XGameStreamingUnregisterClientPropertiesChanged to unregister the callback.

Example

    // On client connection maintain a list of clients and do per client initialization
    void GameStreamingClientManager::OnClientConnected(XGameStreamingClientId client)
    {
        StreamingClient connectedClient;
        connectedClient.clientId = client;
        connectedClient.propertiesChangedToken = token;

        // Do per-client initialization
        XGameStreamingClientPropertiesChangedRegistrationToken token = {0};
        XGameStreamingRegisterClientPropertiesChanged(
            client, m_taskQueue, this, &OnClientPropertiesChanged, &token);        

        connectedClient.propertiesChangedToken = token;
        m_streamingClients.push_back(connectedClient);
    }

    // Some of the properties of our streaming client have changed, react to any of the changes which apply to our game
    void GameStreamingClientManager::OnClientPropertiesChanged(
        void* context,
        XGameStreamingClientId client,
        uint32_t updatedPropertiesCount,
        XGameStreamingClientProperty* updatedProperties)
    {
        GameStreamingClientManager* gsClientManager = reinterpret_cast<GameStreamingClientManager*>(context);

        for (uint32_t i = 0; i < updatedPropertiesCount; ++i)
        {
            switch (updatedProperties[i])
            {
                // The client now has a new physical size of the game stream - update our list of stream
                // sizes to reflect this.
            case XGameStreamingClientProperty::StreamPhysicalDimensions:
                gsClientManager->UpdateClientPhysicalDimensions(client); 
                break;

            case XGameStreamingClientProperty::TouchInputEnabled: 
                gsClientManager->UpdateClientTouchEnabled(client); 
                break;

            default:
                // A characteristic we are not tracking - do nothing
                break;
            }
        }
    }

Requirements

Header: xgamestreaming.h

Library: xgameruntime.lib

Supported platforms: Windows, Xbox One family consoles and Xbox Series consoles

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