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# XblMultiplayerAddConnectionIdChangedHandler

> XblMultiplayerAddConnectionIdChangedHandler

Registers an event handler for notifications when the multiplayer connection id changes. Use the returned XblFunctionContext to unregister the handler.

## Syntax

```cpp theme={null}
XblFunctionContext XblMultiplayerAddConnectionIdChangedHandler(  
         XblContextHandle xblContext,  
         XblMultiplayerConnectionIdChangedHandler* handler,  
         void* context  
)  
```

### Parameters

*xblContext*   \_In\_\
Type: [XblContextHandle](https://docs.xbox.com/reference/live/xsapi-c/types_c/handles/xblcontexthandle.md)

XBOX live context for the local user.

*handler*   \_In\_\
Type: XblMultiplayerConnectionIdChangedHandler\*

The callback function that receives notifications.

*context*   \_In\_opt\_\
Type: void\*

Caller context to be passed the handler.

### Return value

Type: XblFunctionContext

The function context token that was registered for the event.

## Requirements

**Header:** multiplayer\_c.h

**Library:** Microsoft.Xbox.Services.142.C.lib or Microsoft.Xbox.Services.143.C.lib

## See also

[multiplayer\_c](https://docs.xbox.com/reference/live/xsapi-c/multiplayer_c/multiplayer_c_members.md)


## Related topics

- [Multiplayer Session Directory overview](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/live-mpsd-overview.md)
- [Moving from MPSD to PlayFab Multiplayer and MPA](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-to-mlp.md)
- [multiplayer_c (contents)](https://docs.xbox.com/reference/live/xsapi-c/multiplayer_c/multiplayer_c_members.md)
- [XblMultiplayerConnectionIdChangedHandler](https://docs.xbox.com/reference/live/xsapi-c/multiplayer_c/functions/xblmultiplayerconnectionidchangedhandler.md)
- [XblMultiplayerRemoveConnectionIdChangedHandler](https://docs.xbox.com/reference/live/xsapi-c/multiplayer_c/functions/xblmultiplayerremoveconnectionidchangedhandler.md)