1e41f4b71Sopenharmony_ci# HiTraceId 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci 4e41f4b71Sopenharmony_ci## Overview 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ciDefines a struct for **HiTraceId**. 7e41f4b71Sopenharmony_ci 8e41f4b71Sopenharmony_ci**System capability**: SystemCapability.HiviewDFX.HiTrace 9e41f4b71Sopenharmony_ci 10e41f4b71Sopenharmony_ci**Since**: 12 11e41f4b71Sopenharmony_ci 12e41f4b71Sopenharmony_ci**Related module**: [Hitrace](_hitrace.md) 13e41f4b71Sopenharmony_ci 14e41f4b71Sopenharmony_ci 15e41f4b71Sopenharmony_ci## Summary 16e41f4b71Sopenharmony_ci 17e41f4b71Sopenharmony_ci 18e41f4b71Sopenharmony_ci### Member Variables 19e41f4b71Sopenharmony_ci 20e41f4b71Sopenharmony_ciA little-endian **HiTraceId** consists of the following fields in sequence: 21e41f4b71Sopenharmony_ci 22e41f4b71Sopenharmony_ci| Field| Number of Bits| Description| 23e41f4b71Sopenharmony_ci| -------- | -------- | -------- | 24e41f4b71Sopenharmony_ci| uint64_t [valid](_hitrace.md#valid) | 1 | Whether **HiTraceId** is valid. | 25e41f4b71Sopenharmony_ci| uint64_t [ver](_hitrace.md#ver) | 3 | Version number of **HiTraceId**. | 26e41f4b71Sopenharmony_ci| uint64_t [chainId](_hitrace.md#chainid) | 60 | Chain ID of **HiTraceId**. | 27e41f4b71Sopenharmony_ci| uint64_t [flags](_hitrace.md#flags) | 12 | Flag of **HiTraceId**. | 28e41f4b71Sopenharmony_ci| uint64_t [spanId](_hitrace.md#spanid) | 26 | Span ID of **HiTraceId**. | 29e41f4b71Sopenharmony_ci| uint64_t [parentSpanId](_hitrace.md#parentspanid) | 26 | Parent span ID of **HiTraceId**. | 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ciA big-endian **HiTraceId** consists of the following fields in sequence: 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ci| Field| Number of Bits| Description| 34e41f4b71Sopenharmony_ci| -------- | -------- | -------- | 35e41f4b71Sopenharmony_ci| uint64_t [chainId](_hitrace.md#chainid) | 60 | Chain ID of **HiTraceId**. | 36e41f4b71Sopenharmony_ci| uint64_t [ver](_hitrace.md#ver) | 3 | Version number of **HiTraceId**. | 37e41f4b71Sopenharmony_ci| uint64_t [valid](_hitrace.md#valid) | 1 | Whether **HiTraceId** is valid. | 38e41f4b71Sopenharmony_ci| uint64_t [parentSpanId](_hitrace.md#parentspanid) | 26 | Parent span ID of **HiTraceId**. | 39e41f4b71Sopenharmony_ci| uint64_t [spanId](_hitrace.md#spanid) | 26 | Span ID of **HiTraceId**. | 40e41f4b71Sopenharmony_ci| uint64_t [flags](_hitrace.md#flags) | 12 | Flag of **HiTraceId**. | 41