1# MediaLibrary_RequestId 2 3 4## Overview 5 6Defines a request ID, which is a universally unique identifier (UUID) of a request. 7 8A value of this type is returned when a media asset is requested. The request ID can be used to cancel a request. 9 10If a request fails, an all-zero value, for example, **00000000-0000-0000-0000-000000000000** is returned. 11 12**Since**: 12 13 14**Related module**: [MediaAssetManager](_media_asset_manager.md) 15 16**Header file**: [media_asset_base_capi.h](media__asset__base__capi_8h.md) 17 18 19## Summary 20 21 22### Member Variables 23 24| Name| Description | 25| -------- | -------- | 26| char [requestId](#requestid) [UUID_STR_MAX_LENGTH] | Maximum length of a request ID. | 27 28 29## Member Variable Description 30 31 32### requestId 33 34``` 35char MediaLibrary_RequestId::requestId[UUID_STR_MAX_LENGTH] 36``` 37**Description** 38 39Specifies the maximum length of a request ID. 40