Is there a limit on the length of logs printed by HiLog?

The maximum size of a log file is 4096 bytes. Excess content will be discarded.

To prevent incomplete log information, you can encapsulate the LogUtil class in HiLog.

Refer to the sample code below.

Encapsulate the LogUtil class:

import { hilog } from '@kit.PerformanceAnalysisKit';

class LogUtil {
  private static instance: LogUtil;
  private static DOMAIN: number = 0x0000;

  private constructor() {
    // Private constructor to prevent external instantiation
  }

  public static getInstance(): LogUtil {
    if (!LogUtil.instance) {
      LogUtil.instance = new LogUtil();
    }
    return LogUtil.instance;
  }

  public logError(logTag: string, content: string) {
    const maxSize = 1024;
    if (content.length <= maxSize) {
      // Length less than or equal to the limit for direct printing
    } else {
      while (content.length > maxSize) {
        // Loop segmented printing
        let logContent = content.substring(0, maxSize);
        content = content.replace(logContent, '');
        hilog.error(LogUtil.DOMAIN, logTag, '%{public}s', logContent);
        // Print remaining logs
      }
    }
    hilog.error(LogUtil.DOMAIN, logTag, '%{public}s', content);
  }

  public logDebug(logTag: string, content: string) {
    const maxSize = 1024;
    if (content.length <= maxSize) {
      // Length less than or equal to the limit for direct printing
    } else {
      while (content.length > maxSize) {
        //Loop segmented printing
        let logContent = content.substring(0, maxSize);
        content = content.replace(logContent, '');
        hilog.debug(LogUtil.DOMAIN, logTag, '%{public}s', logContent);
        // Print remaining logs
      }
    }
    hilog.debug(LogUtil.DOMAIN, logTag, '%{public}s', content);
  }

  public logInfo(logTag: string, content: string) {
    const maxSize = 1024;
    if (content.length <= maxSize) {
      // Length less than or equal to the limit for direct printing
    } else {
      while (content.length > maxSize) {
        //Loop segmented printing
        let logContent = content.substring(0, maxSize);
        content = content.replace(logContent, '');
        hilog.info(LogUtil.DOMAIN, logTag, '%{public}s', logContent);
        // Print remaining logs
      }
    }
    hilog.info(LogUtil.DOMAIN, logTag, '%{public}s', content);
  }
}

export default LogUtil;

Sample code:

import LogUtil from './LogUtilClass';

@Entry
@Component
struct HiLogIsThereALengthLimit {
  build() {
    Row() {
      Column() {
        Button('hilog util')
          .onClick(() => {
            let str = 'Long log content';
            let utilInfo = LogUtil.getInstance();
            utilInfo.logInfo('testTag', str);
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}