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
17## Summary
18
19
20### Member Variables
21
22| Name| Description |
23| -------- | -------- |
24| char [requestId](#requestid) [UUID_STR_MAX_LENGTH] | Maximum length of a request ID. |
25
26
27## Member Variable Description
28
29
30### requestId
31
32```
33char MediaLibrary_RequestId::requestId[UUID_STR_MAX_LENGTH]
34```
35**Description**
36
37Specifies the maximum length of a request ID.