# hiappevent_param.h

<!--Kit: Performance Analysis Kit-->
<!--Subsystem: HiviewDFX-->
<!--Owner: @liujiaxing2024-->
<!--SE: @junjie_shi-->
<!--TSE: @gcw_KuLfPSbe-->

## Overview

Defines the names of all predefined event parameters. In addition to custom events associated with specific applications, you can use predefined events for logging.

**File to include**: <hiappevent/hiappevent_param.h>

**Library**: libhiappevent_ndk.z.so

**System capability**: SystemCapability.HiviewDFX.HiAppEvent

**Since**: 8

**Related Module**: [HiAppEvent](capi-hiappevent.md)

## Summary

### Macros

| Name                                                                                              | Description        |
|--------------------------------------------------------------------------------------------------|------------|
| [PARAM_USER_ID](#param_user_id) "user_id"                                                        | User ID.<br>**Since**: 8 |
| [PARAM_DISTRIBUTED_SERVICE_NAME](#param_distributed_service_name) "ds_name"                      | Distributed service name.<br>**Since**: 8  |
| [PARAM_DISTRIBUTED_SERVICE_INSTANCE_ID](#param_distributed_service_instance_id) "ds_instance_id" | Distributed service instance ID.<br>**Since**: 8|


## Macro Description

### PARAM_USER_ID

```
#define PARAM_USER_ID "user_id"
```

**Description**

User ID.

**Since**: 8

### PARAM_DISTRIBUTED_SERVICE_NAME

```
#define PARAM_DISTRIBUTED_SERVICE_NAME "ds_name"
```

**Description**

Distributed service name.

**Since**: 8

### PARAM_DISTRIBUTED_SERVICE_INSTANCE_ID

```
#define PARAM_DISTRIBUTED_SERVICE_INSTANCE_ID "ds_instance_id"
```

**Description**

Distributed service instance ID.

**Since**: 8