HarmonyOS 鸿蒙Next录制屏幕文件为空如何解决

import media from ‘@ohos.multimedia.media’;
import fs from ‘@ohos.file.fs’;
import { CommonConstants } from ‘…/constants/CommonConstants’;
import { BusinessError } from ‘@kit.BasicServicesKit’;

export class AVScreenCaptureDemo {
  private screenCapture?: media.AVScreenCaptureRecorder;
  captureConfig: media.AVScreenCaptureRecordConfig = {
    // 开发者可以根据自身的需要设置宽高
    frameWidth: 768,
    frameHeight: 1280,
    // 参考应用文件访问与管理开发示例新建并读写一个文件fd
    fd: 0,
  };

  constructor(captureConfig:media.AVScreenCaptureRecordConfig) {
    this.captureConfig = captureConfig;
  }

  // 调用startRecording方法可以开始一次录屏存文件的流程，结束录屏可以通过点击录屏胶囊停止按钮进行操作。
  public async startRecording() {
    this.screenCapture = await media.createAVScreenCaptureRecorder();
    if (this.screenCapture != undefined) {
      // success
    } else {
      // failed
      return;
    }
    this.screenCapture?.on(‘stateChange’, async (infoType: media.AVScreenCaptureStateCode) => {
      switch (infoType) {
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_STARTED:
          console.info(“录屏成功开始后会收到的回调”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_CANCELED:
          this.screenCapture?.release();
          this.screenCapture = undefined;
          console.info(“不允许使用录屏功能”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_STOPPED_BY_USER:
          this.screenCapture?.release();
          this.screenCapture = undefined;
          console.info(“通过录屏胶囊结束录屏，底层录制会停止”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_INTERRUPTED_BY_OTHER:
          console.info(“录屏因其他中断而停止，底层录制会停止”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_STOPPED_BY_CALL:
          console.info(“录屏过程因通话中断，底层录制会停止”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_MIC_UNAVAILABLE:
          console.info(“录屏麦克风不可用”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_MIC_MUTED_BY_USER:
          console.info(“录屏麦克风被用户静音”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_MIC_UNMUTED_BY_USER:
          console.info(“录屏麦克风被用户取消静音”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_ENTER_PRIVATE_SCENE:
          // 目前可以从系统直接注册监听到进入隐私场景
          console.info(“录屏进入隐私场景”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_EXIT_PRIVATE_SCENE:
          console.info(“录屏退出隐私场景”);
          break;
        case media.AVScreenCaptureStateCode.SCREENCAPTURE_STATE_STOPPED_BY_USER_SWITCHES:
          console.info(“用户账号切换，底层录制会停止”);
          break;
        default:
          break;
      }
    })
    this.screenCapture?.on(‘error’, (err:BusinessError) => {
      console.info(“处理异常情况”,JSON.stringify(err.message));
    })
    await this.screenCapture?.init(this.captureConfig);

    // 豁免隐私窗口
    // let windowIDs = [57, 86];
    // await this.screenCapture?.skipPrivacyMode(windowIDs);

    await this.screenCapture?.startRecording();
  }

  // 可以主动调用stopRecording方法来停止录屏。
  public async stopRecording() {
    if (this.screenCapture == undefined) {
      // Error
      return;
    }
    await this.screenCapture?.stopRecording();

    // 调用release()方法销毁实例，释放资源。
    await this.screenCapture?.release();

    // 最后需要关闭创建的录屏文件fd, fs.close(fd);
  }
}