如何获取存储在 firebase 存储文件夹中的所有图像？

Question

我的 Xamarin.iOS 应用程序中有图片上传功能。我已将此上传的图像存储在 firebase 存储中。我的文件已成功上传到 firebase 存储，但问题是：

When I am trying to get all images using listAll() method of firebase storage it not return all images until the folder have images >= 2.

将图片上传到 firebase 存储的代码：

private void ImagePicker_FinishedPickingMedia(object sender, UIImagePickerMediaPickedEventArgs e)
{
    if (e.Info[UIImagePickerController.MediaType].ToString() == "public.image")
    {
        NSData imgData = new NSData();
        imgData = e.OriginalImage.AsJPEG();

        Guid uniqId = Guid.NewGuid(); // use - uniqId.ToString()

        FirebaseClient.Instance.UploadAdventurePhoto(imgData, this.Adventure.Id, uniqId.ToString());

        //(Path of folder - gs://myapp.appspot.com/adventures/00ac45a3-7c92-4335-a4b8-b9b705c4dd72)
        StorageReference photsUrl = Storage.DefaultInstance.GetReferenceFromUrl($"gs://myapp.appspot.com/adventures/{this.Adventure.Id}");
        photsUrl.ListAll(this.Handler);
    }
    this.imagePicker.DismissViewController(true, null);
}

// Add image to Firestore collection's Document.
private async void Handler(StorageListResult result, NSError arg2)
{
    foreach (var image in result.Items)
    {
        // Logic to append image to Firestore document.
    }
}

/// <param name="imgData">Selected image that needs to be stored on storage.</param>
/// <param name="adventureId">Name of the folder.</param>
/// <param name="imageName">By this name image will get stored in folder.</param>
public void UploadAdventurePhoto(NSData imgData, string adventureId, string imageName)
{
    StorageReference adventurePictureRef = Storage.DefaultInstance.GetReferenceFromPath($"adventures/{adventureId}/{imageName}");
    StorageMetadata metaData = new StorageMetadata();
    metaData.ContentType = "image/jpg";
    adventurePictureRef.PutData(imgData, metaData);
}

第一张图片上传后，图片上传成功，但是当处理程序被调用时，它给出了这个响应：

但之后当我上传第二张图片时它给出 Firebase.Storage.StorageReference1 作为回应：

表示如果有两张图片那么只有它returns url参考。如何解决这个问题？

我已经在存储规则中添加了rules_version = '2';

Answer 1

还没有找到 listAll() 的解决方案，但我已经找到解决这个问题的方法。

我尝试的是使用 listAll() 从 firebase 存储中获取所有图像，但我遇到了这个问题。所以现在我使用 PutData() 方法的完成处理程序而不是 listAll()。

完成处理程序将为您提供上传图像的元数据。从这个元数据中，我们可以像这样直接获取图像： metadata.Name

这是我通过在 UploadAdventurePhoto() 方法中添加完成处理程序来解决问题的方法：

private void UploadAdventurePhoto(NSData imgData, string folderName, string imageName)
{
    StorageReference adventurePictureRef = Storage.DefaultInstance.GetReferenceFromPath($"adventures/{folderName}/{imageName}");
    StorageMetadata metaData = new StorageMetadata();
    metaData.ContentType = "image/jpeg";
    adventurePictureRef.PutData(imgData, metaData, this.HandleStorageGetPutUpdateCompletion);
}

private async void HandleStorageGetPutUpdateCompletion(StorageMetadata metadata, NSError error)
{
    if (error != null)
    {
        // Uh-oh, an error occurred!
        return;
    }

    var url = metadata.Name;
    var downloadUrl = metadata.Path;
    Debug.WriteLine($"Image url - {url}\n Path-{downloadUrl}");

    CollectionReference collectionRef = Firestore.SharedInstance.GetCollection(FirebaseClient.AdventuresCollection);
    var docRef = collectionRef.GetDocument(this.Adventure.Id);

    var keys = new NSString[]
    {
        new NSString($"{AdventureBase.PhotoPropName}"),
    };
    var value = new NSObject[]
    {
        new NSString(url),
    };
    var objects = new NSObject[]
    {
        FieldValue.FromArrayUnion(value),
    };

    var dict = new NSDictionary<NSString, NSObject>(keys, objects);

    await docRef.SetDataAsync(dict, true);
    docRef.AddSnapshotListener(this.UpdateDataHandler);
}

private async void UpdateDataHandler(DocumentSnapshot snapshot, NSError error)
{
    if (error != null)
    {
        // something went wrong
        Debug.WriteLine($"Error - {error.Description}");
        return;
    }
    Toast.MakeToast("Image uploaded successfully").Show();
}

如何获取存储在 firebase 存储文件夹中的所有图像？

How to get all images stored in firebase storage folder?

c#

xamarin.ios

xamarin

firebase-storage

google-cloud-firestore