1# hiappevent_param.h
2
3
4## Overview
5
6Defines the names of all predefined event parameters.
7
8In addition to custom events associated with specific applications, you can use predefined events for logging.
9
10Example:
11
12```
13ParamList list = OH_HiAppEvent_CreateParamList();
14OH_HiAppEvent_AddInt32Param(list, PARAM_USER_ID, 123);
15int res = OH_HiAppEvent_Write("user_domain", EVENT_USER_LOGIN, BEHAVIOR, list);
16OH_HiAppEvent_DestroyParamList(list);
17```
18
19**File to include**: <hiappevent/hiappevent_param.h>
20
21**Since**: 8
22
23**Related module**: [HiAppEvent](_hi_app_event.md)
24
25
26## Summary
27
28
29### Macros
30
31| Name| Description|
32| -------- | -------- |
33| [PARAM_USER_ID](_hi_app_event.md#param_user_id)   "user_id" | User ID.|
34| [PARAM_DISTRIBUTED_SERVICE_NAME](_hi_app_event.md#param_distributed_service_name)   "ds_name" | Distributed service name.|
35| [PARAM_DISTRIBUTED_SERVICE_INSTANCE_ID](_hi_app_event.md#param_distributed_service_instance_id)   "ds_instance_id" | Distributed service instance ID.|
36