#鸿蒙通关秘籍#如何在鸿蒙API 13中实现Worker对宿主线程接口的同步调用？

Worker可以通过callGlobalCallObjectMethod接口来同步调用宿主线程的方法。

在宿主线程中实现接口并注册到Worker：

bash // WorkerCallGlobalUsage.ets import worker from '@ohos.worker'; import { IconItemSource } from './IconItemSource';

const workerInstance: worker.ThreadWorker = new worker.ThreadWorker("entry/ets/pages/workers/Worker.ts");

class PicData { public iconItemSourceList: IconItemSource[] = [];

public setUp(): string { for (let index = 0; index < 20; index++) { const numStart: number = index * 6; this.iconItemSourceList.push(new IconItemSource('$media:startIcon', item${numStart + 1})); this.iconItemSourceList.push(new IconItemSource('$media:background', item${numStart + 2})); this.iconItemSourceList.push(new IconItemSource('$media:foreground', item${numStart + 3})); this.iconItemSourceList.push(new IconItemSource('$media:startIcon', item${numStart + 4})); this.iconItemSourceList.push(new IconItemSource('$media:background', item${numStart + 5})); this.iconItemSourceList.push(new IconItemSource('$media:foreground', item${numStart + 6})); } return "setUpIconItemSourceList success!"; } }

let picData = new PicData(); workerInstance.registerGlobalCallObject("picData", picData); workerInstance.postMessage("run setUp in picData");

在Worker中调用宿主线程的方法：

bash // Worker.ets import { ErrorEvent, MessageEvents, ThreadWorkerGlobalScope, worker } from '@kit.ArkTS'; const workerPort: ThreadWorkerGlobalScope = worker.workerPort; try { let res: string = workerPort.callGlobalCallObjectMethod("picData", "setUp", 0) as string; console.error("worker: ", res); } catch (error) { console.error("worker: error code is " + error.code + " error message is " + error.message); }

以上实现了在Worker中同步调用宿主线程的接口，并实现了相应的通信和数据处理。