如何释放人脸比对服务的资源？

Question

我用完了人脸比对服务，听说要释放资源？这个怎么操作？

Answer 1

import { faceComparator } from '@kit.CoreVisionKit';
import { image } from '@kit.ImageKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { fileIo } from '@kit.CoreFileKit';
import { photoAccessHelper } from '@kit.MediaLibraryKit';

async function faceCompareTest() {
  let chooseImage: PixelMap | undefined = undefined;
  let chooseImage1: PixelMap | undefined = undefined;

  // 从图库中选择两张图片
  let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions();
  PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;
  PhotoSelectOptions.maxSelectNumber = 2;
  let photoPicker: photoAccessHelper.PhotoViewPicker = new photoAccessHelper.PhotoViewPicker();
  let PhotoSelectResult = await photoPicker.select(PhotoSelectOptions);
  let uris = PhotoSelectResult.photoUris;

  if (uris.length !== 2) {
    hilog.info(0x0000, 'testTag', "selected uris length is not 2");
    return;
  }

  // 将选择的图片转换为PixelMap
  let fileSource = await fileIo.open(uris[0], fileIo.OpenMode.READ_ONLY);
  let imageSource = image.createImageSource(fileSource.fd);
  chooseImage = await imageSource.createPixelMap();

  fileSource = await fileIo.open(uris[1], fileIo.OpenMode.READ_ONLY);
  imageSource = image.createImageSource(fileSource.fd);
  chooseImage1 = await imageSource.createPixelMap();

  hilog.info(0x0000, 'testTag', `chooseImage=${chooseImage.toString()}`);
  hilog.info(0x0000, 'testTag', `chooseImage1=${chooseImage1.toString()}`);

  if (!chooseImage || !chooseImage1) {
    hilog.info(0x0000, 'testTag', "chooseImage or chooseImage1 is undefined");
    return;
  }

  // 调用人脸比对接口
  let visionInfo: faceComparator.VisionInfo = {
    pixelMap: chooseImage
  };
  let visionInfo1: faceComparator.VisionInfo = {
    pixelMap: chooseImage1
  };

  let data: faceComparator.FaceCompareResult = await faceComparator.compareFaces(visionInfo, visionInfo1);
  let similarity = (data.similarity * 100).toFixed(2);
  let isSamePerson = data.isSamePerson ? "is" : "is not";
  let faceString = `Similarity: ${similarity}%. ${isSamePerson} the same person`;
  hilog.info(0x0000, 'testTag', "faceString data is " + faceString);

  // 释放资源
  if (chooseImage && chooseImage1) {
    chooseImage.release();
    chooseImage1.release();
  }
}

faceCompareTest().catch((err: BusinessError) => {
  hilog.error(0x0000, 'faceCompareSample', `Failed to compare faces. code：${err.code}，message：${err.message}`);
});