import fileIo from '@ohos.fileio'
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private stream: fileIo.Stream

//open stream from fd
this.stream = fileIo.fdopenStreamSync(writeFd, "r+")
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create_fileIo() {
    try {
      this.oriPath = path + '/xxx.txt'
      //number fd - file descriptor.
      //0o2：读写打开。0o100：若文件不存在，则创建文件。
      //0o666：所有者具有读、写权限，所有用户组具有读、写权限，其余用户具有读、写权限。
      this.fd = fileIo.openSync(this.oriPath, 0o2 | 0o100, 0o666)

      prompt.showToast({ message: 'create_file success =>' + this.oriPath, duration: 2000 })
      console.log('FileIo fd =' + this.fd)

      fileIo.close(this.fd)
    } catch (error) {
      console.error('FileIo error=' + error)
    }
 }
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  rename_fileIo() {

    this.newPath = path + '/FileIo.txt'
    //文件重命名，原，新
    fileIo.renameSync(this.oriPath, this.newPath)
    

    prompt.showToast({ message: 'rename_file success =>' + this.newPath, duration: 2000 })
  }
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  write_fileIo() {

    //number fd - file descriptor.
    //0o2：读写打开。0o100：若文件不存在，则创建文件。
    //0o666：所有者具有读、写权限，所有用户组具有读、写权限，其余用户具有读、写权限。
    let writeFd = fileIo.openSync(this.newPath, 0o2 | 0o100, 0o666)

    //open stream from fd
    this.stream = fileIo.fdopenStreamSync(writeFd, "r+")

    //write content
    let writelength = this.stream.writeSync(writeContent, {
      offset: 0,
      length: writeContent.length,
      position: 0,
      encoding: 'utf-8'
    })


    prompt.showToast({ message: 'write_fileIo success =>' + 'hello, fileIo', duration: 2000 })
    console.log('FileIo WriteLength = ' + writelength)


    this.stream.close()
    fileIo.close(writeFd)


  }
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  read_fileIo() {


    //number fd - file descriptor.
    let readFd = fileIo.openSync(this.newPath, 0o0)

    //open stream from fd
    this.stream = fileIo.fdopenStreamSync(readFd, "r")


    //buf
    let buf = new ArrayBuffer(4096)

    //string len
    let length = this.stream.readSync(buf, { offset: 0, length: writeContent.length, position: 0 })


    //char to string
    this.readText = String.fromCharCode.apply(null, new Uint8Array(buf))


    prompt.showToast({ message: 'read_fileIo success', duration: 2000 })
    console.log('FileIo buf = ' + this.readText)
    console.log('FileIo length = ' + length)


    //关闭
    this.stream.close()
    fileIo.close(readFd)


  }
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  delete_fileIo() {

    //删除其实是取消链接的含义
    fileIo.unlinkSync(this.newPath)


    prompt.showToast({ message: 'delete_file success', duration: 2000 })
  }
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//获取Ability或应用的分布式文件路径
context.getOrCreateDistributedDir().then((data) => {
//获取应用在内部存储上的文件路径
//context.getFilesDir().then((data) => {
//应用在内部存储上的缓存目录
//context.getCacheDir().then((data) => {
  path = data + '/tmp'
  console.log('FileIo path =' + path)
})
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  create_dir() {
    //创建目录
    fileIo.mkdir(path)
      .then(data => {
        console.log(`FileIo mkdir succ`)

        let dir = fileIo.opendirSync(path)
        console.log(`FileIo mkdir succ=${JSON.stringify(dir)}`)

        //创建文件
        this.create_fileIo()
      })
      .catch(err => {
        console.error(`FileIo mkdir err=${err}`)
      })
  }
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