1# DFX Development 2 3## How do I locate the fault when the application crashes? 4 5Applicable to: OpenHarmony SDK 3.2.5.5 6 71. Locate the crash-related code based on the service log. 8 92. View the error information in the crash file, which is located at **/data/log/faultlog/faultlogger/**. 10 11## Why cannot access controls in the UiTest test framework? 12 13Applicable to: OpenHarmony SDK 3.2.5.5 14 15Check whether **persist.ace.testmode.enabled** is turned on. 16 17Run **hdc\_std shell param get persist.ace.testmode.enabled**. 18 19If the value is **0**, run the **hdc\_std shell param set persist.ace.testmode.enabled 1** to enable the test mode. 20 21 22## Why is private displayed in logs when the format parameter type of HiLog in C++ code is %d or %s? 23 24When format parameters such as **%d** and **%s** are directly used, the standard system uses **private** to replace the actual data for printing by default to prevent data leakage. To print the actual data, replace **%d** with **%{public}d** or replace **%s** with **%{public}s**. 25 26## What should I do if the hilog.debug log cannot be printed? 27 28Applicable to: OpenHarmony SDK 3.2.5.5, stage model of API version 9 29 30Run **hdc_std shell hilog -b D** to turn on the debugging switch. 31 32## Is HiLog or console recommended for log printing? How do I set the domain if HiLog is used? 33 34Applicable to: OpenHarmony SDK 3.2.2.5 35 36You are advised to use the [HiLog](../reference/apis/js-apis-hilog.md) for log printing. For details about how to set the **domain** parameter, see the [Development Guide](../reference/apis/js-apis-hilog.md#hilogisloggable). 37 38## What is the maximum length of a log record when HiLog is used? Is it configurable? 39 40Applicable to: OpenHarmony SDK 3.2.2.5 41 42The maximum length of a log record is 1,024 characters, and it is not changeable. 43 44## Can I separate multiple strings by spaces in the tag parameter of the HiLog API? 45 46Applicable to: OpenHarmony SDK 3.2.6.5, stage model of API version 9 47 48No. Separating multiple strings by spaces is not allowed. 49 50## How do I print real data if HiLog does not contain data labeled by {public}? 51 52Applicable to: OpenHarmony SDK 3.2.6.5, stage model of API version 9 53 54Run **hdc\_std shell hilog -p off** to disable logging of data labeled by {public}. 55