HarmonyOS 如何将PhotoViewPicker返回的uri封装成File类型对象？

let PhotoSelectOptions = new picker.PhotoSelectOptions(); 
PhotoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE; 
PhotoSelectOptions.maxSelectNumber = 5; 
let photoPicker = new picker.PhotoViewPicker(); 
photoPicker.select(PhotoSelectOptions) 
  .then(async (PhotoSelectResult: picker.PhotoSelectResult) => { 
    console.info('PhotoViewPicker.select successfully, PhotoSelectResult uri: ' + JSON.stringify(PhotoSelectResult)); 
    let file = fs.openSync(PhotoSelectResult.photoUris[0])  //直接将url转化为file类型 
  });