HarmonyOS 关于使用getRawFileContentSync提示Rawfile path is invalid的问题

关于使用getRawFileContentSync提示Rawfile path is invalid的问题，从官方文档中无法定位出是路径给错了还是使用的方式不对。

错误日志：

07-19 11:37:22.088   13435-13435  C01e00/ResourceManagerJs   E     Failed to get rawfile by city_code.json 
07-19 11:37:22.088   13435-13435  A0ff00/[QZD]     E     CityCodeHelper, getRawFileContentSync failed, error code: 9001005, message: Rawfile path is invalid.

具体代码如下：

import { JSON, util } from '@kit.ArkTS'
import { CityCodeBean } from '../bean/CityCodeBean';
import { CityCodeFileDataSource } from '../datasource/CityCodeFileDataSource';
import { common } from '@kit.AbilityKit'
import { BusinessError } from '@ohos.base';
import { log } from 'lib_common/src/main/ets/utils/Logger';

const TAG = 'CityCodeHelper'

class CityCodeHelper {
  constructor() {
    CityCodeFileDataSource.init(getContext(this) as common.ApplicationContext)
  }

  /*
   * 此方法提供的CityCodeBean 类型绝对安全，无需再次转换
   * */
  getCityCodes():Array<CityCodeBean> {
    const cityCodes = CityCodeFileDataSource.getCityCodes()
    if (cityCodes == null) {
      return this.getLocalCityCodeTransformer()
    }else {
      let safeCityCodes:Array<CityCodeBean> = []
      cityCodes.forEach((item)=>{
        safeCityCodes.push(this.transform(item))
      })
      return safeCityCodes
    }
  }

  /*
   * 保存网络上同步得到的城市码表数据
   * @param cityCodes: 原始数据表弱类型对象，但是必须符合`CityCodeBean`的数据结构
   * @param version:获取到的版本号
   * */
  saveCityCodes(cityCodes:Array<CityCodeBean>, version:number) {
    CityCodeFileDataSource.saveCityCodes(cityCodes, version)
  }

  private getLocalCityCodeTransformer():Array<CityCodeBean> {
    try {
      let rawFile: Uint8Array = getContext(this).resourceManager.getRawFileContentSync('city_code.json');
      let localCityCodeStr: string = util.TextDecoder.create("utf-8", { ignoreBOM: true }).decodeWithStream(rawFile);
      let localCityCodes:Array<CityCodeBean> = []
      const _cityCodes:Array<CityCodeBean> = JSON.parse(localCityCodeStr) as Array<CityCodeBean>
      _cityCodes.forEach((item)=>{
        localCityCodes.push(this.transform(item))
      })
      return localCityCodes
    } catch (error) {
      let code = (error as BusinessError).code;
      let message = (error as BusinessError).message;
      log.error(TAG, `getRawFileContentSync failed, error code: ${code}, message: ${message}.`)
      return []
    }
  }

  private transform(data:Object):CityCodeBean {
    let original:CityCodeBean = data as CityCodeBean
    let subs:Array<CityCodeBean> | null = []
    if (Array.isArray(original.sub)) {
      original.sub?.forEach((item)=>{
        subs?.push(this.transform(item))
      })
    }else {
      subs = null
    }

    return new CityCodeBean(
      original.id,
      original.name,
      original.shortName,
      original.type,
      original.parentId,
      original.levelType,
      original.pinyin,
      original.shortPinyin,
      subs
    )
  }
}

export const cityCodeInstance = new CityCodeHelper()