1# HiTraceId
2
3
4## Overview
5
6Defines a struct for **HiTraceId**.
7
8**System capability**: SystemCapability.HiviewDFX.HiTrace
9
10**Since**: 12
11
12**Related module**: [Hitrace](_hitrace.md)
13
14
15## Summary
16
17
18### Member Variables
19
20A little-endian **HiTraceId** consists of the following fields in sequence:
21
22| Field| Number of Bits| Description|
23| -------- | -------- | -------- |
24| uint64_t [valid](_hitrace.md#valid) | 1 | Whether **HiTraceId** is valid. |
25| uint64_t [ver](_hitrace.md#ver) | 3 | Version number of **HiTraceId**. |
26| uint64_t [chainId](_hitrace.md#chainid) | 60 | Chain ID of **HiTraceId**. |
27| uint64_t [flags](_hitrace.md#flags) | 12 | Flag of **HiTraceId**. |
28| uint64_t [spanId](_hitrace.md#spanid) | 26 | Span ID of **HiTraceId**. |
29| uint64_t [parentSpanId](_hitrace.md#parentspanid) | 26 | Parent span ID of **HiTraceId**. |
30
31A big-endian **HiTraceId** consists of the following fields in sequence:
32
33| Field| Number of Bits| Description|
34| -------- | -------- | -------- |
35| uint64_t [chainId](_hitrace.md#chainid) | 60 | Chain ID of **HiTraceId**. |
36| uint64_t [ver](_hitrace.md#ver) | 3 | Version number of **HiTraceId**. |
37| uint64_t [valid](_hitrace.md#valid) | 1 | Whether **HiTraceId** is valid. |
38| uint64_t [parentSpanId](_hitrace.md#parentspanid) | 26 | Parent span ID of **HiTraceId**. |
39| uint64_t [spanId](_hitrace.md#spanid) | 26 | Span ID of **HiTraceId**. |
40| uint64_t [flags](_hitrace.md#flags) | 12 | Flag of **HiTraceId**. |
41