#鸿蒙通关秘籍#如何利用多线程处理鸿蒙中的密集 I/O 任务？

在寻找应对鸿蒙操作系统中I/O密集型任务的方法时，以下步骤将确保并发任务不阻塞主线程：

1. 定义一个执行文件I/O操作的函数。

typescript import { fileIo } from '@kit.CoreFileKit'

export async function write(data: string, filePath: string): Promise<void> { let file = await fileIo.open(filePath, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE); await fileIo.write(file.fd, data); fileIo.close(file); }

2. 实现并发任务执行，处理文件存储。

typescript import { write } from './write'; import { BusinessError } from '@kit.BasicServicesKit'; import { taskpool } from '@kit.ArkTS'; import { common } from '@kit.AbilityKit';

@Concurrent async function concurrentTest(fileList: string[]): Promise<boolean> { for (let i = 0; i < fileList.length; i++) { write('Hello World!', fileList[i]) .then(() => console.info(Succeeded in writing the file. FileList: ${fileList[i]})) .catch((err: BusinessError) => { console.error(Failed to write the file. Code is ${err.code}, message is ${err.message}); return false; }); } return true; }

3. 借助 TaskPool 执行并调度任务。

typescript let context = getContext() as common.UIAbilityContext; let filePath1 = context.filesDir + "/path1.txt"; let filePath2 = context.filesDir + "/path2.txt";

taskpool.execute(concurrentTest, [filePath1, filePath2]) .then(() => console.info("taskpool: execute success"));