> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# XblMultiplayerActivityGetActivityResultSize

> XblMultiplayerActivityGetActivityResultSize

# XblMultiplayerActivityGetActivityResultSize

Gets the buffer size needed to store the results of a get activity call.

## Syntax

```cpp theme={null}
HRESULT XblMultiplayerActivityGetActivityResultSize(  
         XAsyncBlock* async,  
         size_t* resultSizeInBytes  
)  
```

### Parameters

*async*   \_In\_\
Type: XAsyncBlock\*

The `XAsyncBlock` for this operation.

*resultSizeInBytes*   \_Out\_\
Type: size\_t\*

The size in bytes for the result buffer.

### Return value

Type: HRESULT

HRESULT return code for this API operation.

## Remarks

To see how this function is used, see "Getting activities" in the [Activities](/services/xbox-services/multiplayer/mpa/how-to/live-mpa-client-how-to#activities) section of [Example code for Multiplayer Activity](/services/xbox-services/multiplayer/mpa/how-to/live-mpa-client-how-to). <br /><br /> For more information about multiplayer activities, see [Activities](/services/xbox-services/multiplayer/mpa/concepts/live-mpa-activities).

## Requirements

**Header:** multiplayer\_activity\_c.h

**Library:** Microsoft.Xbox.Services.14x.GDK.C.lib

## See also

[multiplayer\_activity\_c](/reference/live/xsapi-c/multiplayer_activity_c/multiplayer_activity_c_members)\
[XblMultiplayerActivityGetActivityAsync](/reference/live/xsapi-c/multiplayer_activity_c/functions/xblmultiplayeractivitygetactivityasync)\
[XblMultiplayerActivityGetActivityResult](/reference/live/xsapi-c/multiplayer_activity_c/functions/xblmultiplayeractivitygetactivityresult)


## Related topics

- [XblMultiplayerActivityGetActivityResult](/reference/live/xsapi-c/multiplayer_activity_c/functions/xblmultiplayeractivitygetactivityresult.md)
- [XblMultiplayerActivityGetActivityAsync](/reference/live/xsapi-c/multiplayer_activity_c/functions/xblmultiplayeractivitygetactivityasync.md)
- [Example code for Multiplayer Activity](/services/xbox-services/multiplayer/mpa/how-to/live-mpa-client-how-to.md)
- [Moving from MPSD to PlayFab Multiplayer and MPA](/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-to-mlp.md)
- [XblMultiplayerGetActivitiesWithPropertiesForUsersResultSize](/reference/live/xsapi-c/multiplayer_c/functions/xblmultiplayergetactivitieswithpropertiesforusersresultsize.md)