HarmonyOS 鸿蒙Next 读取沙箱目录下的文件，内容获取不全

ide的日志打印是有长度限制的，参考文档说明：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V13/hilog-guidelines-ndk-V13# 约束与限制

我测试是可以实现完整的读取文件的，参考demo：

import { fileIo as fs } from '@kit.CoreFileKit';
import { buffer } from '@kit.ArkTS';

@Entry
@Component
struct index1 {
  @State url:string = ''
  @State message:string = ''
  build() {
    Column(){
      Button('保存沙箱')
        .onClick(()=>{
          getContext(this).resourceManager.getRawFileContent('index.html', (_err, value) => {
            let myBuffer: ArrayBufferLike = value.buffer
            let context = getContext(this);
            //沙箱路径
            let filePath = context.filesDir + "/index.html";
            this.url =filePath
            console.log("testTag-filePath:" + filePath);
            let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
            let writeLen = fs.writeSync(file.fd, myBuffer);
            console.info("testTag-write data to file succeed and size is:" + writeLen);
            fs.closeSync(file);
          })

        })
      Button('读取文件').onClick((event: ClickEvent) => {
        let openfile = fs.openSync(this.url,fs.OpenMode.READ_WRITE)
        let arraybuffer = new ArrayBuffer(10000)
        let readLen =fs.readSync(openfile.fd,arraybuffer)
        let hotIndexContent = buffer.from(arraybuffer).toString()
        this.message =hotIndexContent

      })
      Scroll(){

        Text(this.message)
      }
      .height(500)


    }
  }
}