harmony 鸿蒙Single I/O Task Development

  • 2023-10-30
  • 浏览 (360)

Single I/O Task Development

Asynchronous concurrency provided by Promise and async/await is applicable to the development of a single I/O task. The following uses the asynchronous concurrency capability to write a file as an example.

  1. Implement the logic of a single I/O task.

    import fs from '@ohos.file.fs';
    import { BusinessError } from '@ohos.base';
    async function write(data: string, filePath: string): Promise<void> {
      let file: fs.File = await fs.open(filePath, fs.OpenMode.READ_WRITE);
      fs.write(file.fd, data).then((writeLen: number) => {
        fs.close(file);
      }).catch((err: BusinessError) => {
        console.error(`Failed to write data. Code is ${err.code}, message is ${err.message}`);
      })
    }
    
  2. Use the asynchronous capability to invoke the single I/O task. For details about how to obtain filePath in the example, see Obtaining Application File Paths.

    let filePath: string = "path"; // Application file path
    write('Hello World!', filePath).then(() => {
      console.info('Succeeded in writing data.');
    })
    

你可能感兴趣的鸿蒙文章

harmony 鸿蒙ArkTS Common Library

harmony 鸿蒙Comparison Between the Actor and Memory Sharing Models

harmony 鸿蒙Overview of ArkTS Common Library

harmony 鸿蒙Asynchronous Concurrency Overview

harmony 鸿蒙Concurrency Overview

harmony 鸿蒙Overview of Containers

harmony 鸿蒙CPU Intensive Task Development

harmony 鸿蒙I/O Intensive Task Development

harmony 鸿蒙Linear Containers

harmony 鸿蒙Multithread Concurrency Overview

0  赞