HarmonyOS 继承自C++类的TS类如何使用Sendable协议
由于SDK核心代码是C++实现,用TS封装了API。
// TS 声明的C++类
import image from '@ohos.multimedia.image';
import { XavThumbnailInfo } from '../../../../ets/videoedit/define/XavThumbnailInfo';
import { XavEditTimeline } from '../../../../ets/videoedit/project/XavEditTimeline';
import { lang, collections } from '@kit.ArkTS'
@Sendable
export declare class NapiThumbnailGetter {
constructor();
destroy: () => void;
getThumbnailFromFilePath: (filePath: string, timestamp: number, timeStep: number, expectWidth: number,
expectHeight: number) => image.PixelMap;
getThumbnailFromTimeline: (timeline: XavEditTimeline, timestamp: number, timeStep: number, expectWidth: number,
expectHeight: number) => image.PixelMap;
getThumbnailInfoFromTimeline: (timeline: XavEditTimeline, trackIndex: number, timestamp: number, timeStep: number,
expectWidth: number, expectHeight: number, thumbnailInfo: XavThumbnailInfo) => boolean;
}
// 继承自C++类的TS API
import NativeSdk from 'libares.so';
@Sendable
export class XavThumbnailGetter extends NativeSdk.NapiThumbnailGetter {
}
// 由于ThumbnailGetter这个类的几个方法耗时高,因此业务层需要另起一个worker或者taskPool执行ThumbnailGetter的方法。类似下面的代码
@Concurrent
function grabberThumbnailFromTimeline(timeline: XavEditTimeline, thumbnailGetter: XavThumbnailGetter,
timeStamp: number): image.PixelMap {
console.info("printArgs: " + timeStamp);
return thumbnailGetter.getThumbnailFromTimeline(timeline, timeStamp, 1000, 100, 100);
}
this.addButton('Timeline抽缩略图异步', () => {
for (let i = 0; i < 100; i++) {
taskpool.execute(grabberThumbnailFromTimeline, this.timeline, this.thumbnailGetter, i * 1000)
.then((image: Object) => {
this.image = this.image;
});
}
});
编译工程时会发生如下错误:
ERROR: ArkTS:ERROR File: /Users/user/Development/red/videoeditlib-xhs/harmony/ReDemo/videoedit/src/main/cpp/types/libvideoedit/utils/NapiThumbnailGetter.ets:11:5
Properties in "Sendable" classes and interfaces must have a Sendable data type (arkts-sendable-prop-types)
ERROR: ArkTS:ERROR File: /Users/user/Development/red/videoeditlib-xhs/harmony/ReDemo/videoedit/src/main/cpp/types/libvideoedit/utils/NapiThumbnailGetter.ets:12:5
Properties in "Sendable" classes and interfaces must have a Sendable data type (arkts-sendable-prop-types)
ERROR: ArkTS:ERROR File: /Users/user/Development/red/videoeditlib-xhs/harmony/ReDemo/videoedit/src/main/cpp/types/libvideoedit/utils/NapiThumbnailGetter.ets:14:5
Properties in "Sendable" classes and interfaces must have a Sendable data type (arkts-sendable-prop-types)
ERROR: ArkTS:ERROR File: /Users/user/Development/red/videoeditlib-xhs/harmony/ReDemo/videoedit/src/main/cpp/types/libvideoedit/utils/NapiThumbnailGetter.ets:16:5
Properties in "Sendable" classes and interfaces must have a Sendable data type (arkts-sendable-prop-types)
上述这种应用场景,有没有简便的方法支持多线程共享对象?
HarmonyOS
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