HarmonyOS鸿蒙Next中为什么在图片属性那里看不到隐性标识

开发者您好，如果本身已经能读到添加的元数据属性，您可以看下是否是调用图片编码接口未设置needsPackProperties。调用图片编码接口时，需要设置packingOption的needsPackProperties属性为true（该属性为是否需要编码图片属性信息，例如EXIF。true表示需要，false表示不需要。默认值为false）。我这边已验证添加后是可以看到隐性标识的

我本地的验证代码如下：

import { hilog } from '@kit.PerformanceAnalysisKit';
import { fileIo, fileIo as fs } from '@kit.CoreFileKit';
import { common } from '@kit.AbilityKit';
import { image } from '@kit.ImageKit';
import { photoAccessHelper } from '@kit.MediaLibraryKit';

const TAG = 'ImageMetadataUtil';
@Entry
@Component
struct Index {
  context: common.UIAbilityContext = this.getUIContext()?.getHostContext() as common.UIAbilityContext;
  aboutToAppear() {
  }
  @State filePath: string = '';
  build() {
    Column(){
      Button('添加隐式标识')
        .width('45%')
        .height(45)
        .margin(5)
        .onClick(async () => {
          this.filePath = this.context.filesDir+'/2.jpg'
          const file = await fs.open(this.filePath, fs.OpenMode.READ_WRITE);
          const imageSource = image.createImageSource(file.fd);

          // 尝试使用不同的属性键和更简单的值格式，提高兼容性
          // 🔧 修复：跳过USER_COMMENT属性，只写入Software和ImageDescription
          interface ExifProperty {
            key: image.PropertyKey;
            value: string;
          }

          const propertiesToTry: ExifProperty[] = [
            { key:image.PropertyKey.SOFTWARE, value: 'AI Generated sdsdsd' },
            { key: image.PropertyKey.IMAGE_DESCRIPTION, value: 'AI Generated afdfadffdas' }
          ];

          let successCount = 0;

          for (const prop of propertiesToTry) {
            try {
              await imageSource.modifyImageProperty(prop.key, prop.value);
              hilog.info(0x0000, TAG, `成功写入属性 ${prop.key}: ${prop.value}`);
              successCount++;
            } catch (error) {
              hilog.warn(0x0000, TAG, `写入属性 ${prop.key} 失败: ${JSON.stringify(error)}`);
              // 继续尝试其他属性，不中断流程
            }
          }

          await imageSource.release();
          await fs.close(file);
        })
      SaveButton({ text: SaveDescription.SAVE_IMAGE, buttonType: ButtonType.Normal }).onClick(async ()=>{
        let helper = photoAccessHelper.getPhotoAccessHelper(this.context);
        try {
          let uri = await helper.createAsset(photoAccessHelper.PhotoType.IMAGE, 'jpg')
          let file = await fileIo.open(uri, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE)
          // 写到媒体库文件中
          const source = image.createImageSource(this.filePath) // 图片对象
          const packer = image.createImagePacker() // 创建打包对象
          let commodityPixelMap: image.PixelMap = await source.createPixelMap();
          let pictureObj: image.Picture = image.createPicture(commodityPixelMap);

          const buffer = await packer.packing(pictureObj, {
            quality: 100,
            format: 'image/jpeg',
            needsPackProperties: true
          })
          await fileIo.write(file.fd, buffer);
          await fileIo.close(file.fd);
        } catch (error) {
          const err: BusinessError = error as BusinessError
          console.error(`Failed to save photo. Code is ${err.code}, message is ${err.message}`)
        }
      })
    }
  }
}