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Registers a handler function to receive a notification that is sent when there is a resync message from the Real-Time Activity (RTA) service.

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Syntax

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Parameters

xboxLiveContext   _In_
Type: XblContextHandle XBOX services context handle. handler   _In_
Type: XblRealTimeActivityResyncHandler* The callback function that receives notifications. context   _In_opt_
Type: void* Caller context that will be passed back to the handler function.

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Return value

Type: XblFunctionContext A XblFunctionContext object that can be used to unregister the event handler. Pass it to XblRealTimeActivityRemoveResyncHandler. A successful registration returns a token greater than 0. If the function fails, it can return an HRESULT error code cast to XblFunctionContext, which is a negative value. Possible error codes include the following. This list isn’t exhaustive.

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Remarks

This message indicates that data may have been lost and to resync all data by calling corresponding REST API’s. Wherever possible, XSAPI will automatically resync the subscription and invoke the corresponding handler. For multiplayer session changed subscriptions, titles must resync their own sessions.

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Requirements

Header: real_time_activity_c.h Library: Microsoft.Xbox.Services.142.C.lib or Microsoft.Xbox.Services.143.C.lib

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See also

real_time_activity_c
Last modified on October 29, 2026