如何读取相册中的图片

import photoAccessHelper from '@ohos.file.photoAccessHelper'; 
import image from '@ohos.multimedia.image'; 
import fs from '@ohos.file.fs'; 
 
@Entry 
@Component 
struct Index { 
  @State getAlbum: string = '显示相册中的图片'; 
  @State pixel: image.PixelMap | undefined = undefined; 
  @State albumPath: string = ''; 
  @State photoSize: number = 0; 
 
  async getPictureFromAlbum() { 
    // 拉起相册，选择图片 
    let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions(); 
    PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE; 
    PhotoSelectOptions.maxSelectNumber = 1; 
    let photoPicker = new photoAccessHelper.PhotoViewPicker(); 
    let photoSelectResult: photoAccessHelper.PhotoSelectResult = await photoPicker.select(PhotoSelectOptions); 
    this.albumPath = photoSelectResult.photoUris[0]; 
 
    // 读取图片为buffer 
    const file = fs.openSync(this.albumPath, fs.OpenMode.READ_WRITE); 
    this.photoSize = fs.statSync(file.fd).size; 
    console.info('Photo Size: ' + this.photoSize); 
    let buffer = new ArrayBuffer(this.photoSize); 
    fs.readSync(file.fd, buffer); 
    fs.closeSync(file); 
 
    // 解码成PixelMap 
    const imageSource = image.createImageSource(buffer); 
    console.log('imageSource: ' + JSON.stringify(imageSource)); 
    this.pixel = await imageSource.createPixelMap({}); 
  } 
 
  // ...... 
}