1# MetadataOutput_Callbacks 2 3 4## Overview 5 6The **MetadataOutput_Callbacks** struct defines the callbacks used for metadata output. 7 8**See** 9 10[OH_MetadataOutput_RegisterCallback](_o_h___camera.md#oh_metadataoutput_registercallback) 11 12**Since**: 11 13 14**Related module**: [OH_Camera](_o_h___camera.md) 15 16 17## Summary 18 19 20### Member Variables 21 22| Name| Description| 23| -------- | -------- | 24| [onMetadataObjectAvailable](#onmetadataobjectavailable) | Callback to report the metadata output result.| 25| [onError](#onerror) | Callback to report a metadata output error.| 26 27 28## Member Variable Description 29 30 31### onError 32 33``` 34OH_MetadataOutput_OnError MetadataOutput_Callbacks::onError 35``` 36 37**Description** 38 39Callback to report a metadata output error. 40 41 42### onMetadataObjectAvailable 43 44``` 45OH_MetadataOutput_OnMetadataObjectAvailable MetadataOutput_Callbacks::onMetadataObjectAvailable 46``` 47 48**Description** 49 50Callback to report the metadata output result. 51