如何获取所有存储在Firebase存储文件夹中的图像? [英] How to get all images stored in firebase storage folder?
问题描述
我的Xamarin.iOS应用程序中具有图像上传功能.我已将此上传的图片存储在Firebase存储中.我的文件已成功上传到Firebase存储，但是问题是:
当我尝试使用Firebase的listAll()方法获取所有图像时除非文件夹中的图片> = 2，否则它不会返回所有图片.
将图像上传到Firebase存储上的代码:
私有无效ImagePicker_FinishedPickingMedia(对象发送者，UIImagePickerMediaPickedEventArgs e){如果(e.Info [UIImagePickerController.MediaType] .ToString()=="public.image"){NSData imgData =新的NSData();imgData = e.OriginalImage.AsJPEG();Guid uniqId = Guid.NewGuid();//使用-uniqId.ToString()FirebaseClient.Instance.UploadAdventurePhoto(imgData，this.Adventure.Id，uniqId.ToString());//(文件夹路径-gs://myapp.appspot.com/adventures/00ac45a3-7c92-4335-a4b8-b9b705c4dd72)StorageReference photsUrl = Storage.DefaultInstance.GetReferenceFromUrl($"gs://myapp.appspot.com/adventures/{this.Adventure.Id}")；photsUrl.ListAll(this.Handler);}this.imagePicker.DismissViewController(true，null);}//将图像添加到Firestore集合的文档中.私有异步void处理程序(StorageListResult结果，NSError arg2){foreach(result.Items中的可变图像){//将图片附加到Firestore文档的逻辑.}} ///< param name =" imgData">需要存储在存储器中的所选图像.///< param name ="adventureId">文件夹名称.</param>///< param name ="imageName">通过此名称图像将被存储在文件夹中.公共无效UploadAdventurePhoto(NSData imgData，字符串AdventureId，字符串imageName){StorageReference adventurePictureRef = Storage.DefaultInstance.GetReferenceFromPath($"adventures/{adventureId}/{imageName}");StorageMetadata metaData =新的StorageMetadata();metaData.ContentType ="image/jpg";adventurePictureRef.PutData(imgData，metaData);} 上传第一张图片后，图片成功上传，但是当调用处理程序时，它会给出以下响应:
但是在此之后，当我上传第二张图像时，它给出了Firebase.Storage.StorageReference
表示如果有两个图像，则只有它返回url引用.如何解决此问题?
我已经在存储规则中添加了 rules_version ='2'; .
还没有解决listAll()的方法，但是我已经解决了这个问题.
我正在尝试的是使用listAll()从Firebase存储中获取所有图像，但是在这种情况下，我遇到了这个问题.因此，现在我不是使用listAll()而是使用PutData()方法的完成处理程序.
完成处理程序将为您提供上载图像的元数据.从此元数据中，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此问题的方法:
私有无效UploadAdventurePhoto(NSData imgData，字符串folderName，字符串imageName){StorageReference adventurePictureRef = Storage.DefaultInstance.GetReferenceFromPath($"adventures/{folderName}/{imageName}");StorageMetadata metaData =新的StorageMetadata();metaData.ContentType =图像/jpeg"；AdventurePictureRef.PutData(imgData，metaData，this.HandleStorageGetPutUpdateCompletion);} 私有异步void HandleStorageGetPutUpdateCompletion(StorageMetadata元数据，NSError错误){如果(错误！= null){//哦，发生错误！返回;}var url = metadata.Name;var downloadUrl = metadata.Path;Debug.WriteLine($图片网址-{url} \ n路径-{downloadUrl}")；CollectionReference collectionRef = Firestore.SharedInstance.GetCollection(FirebaseClient.AdventuresCollection);var docRef = collectionRef.GetDocument(this.Adventure.Id);var键=新的NSString []{新的NSString($" {AdventureBase.PhotoPropName}")，};var值=新的NSObject []{新的NSString(url)，};var objects = new NSObject []{FieldValue.FromArrayUnion(value)，};var dict = new NSDictionary< NSString，NSObject>(键，对象);等待docRef.SetDataAsync(dict，true);docRef.AddSnapshotListener(this.UpdateDataHandler);} 私有异步void UpdateDataHandler(DocumentSnapshot快照，NSError错误){如果(错误！= null){//出问题了Debug.WriteLine($错误-{error.Description}"));返回;}Toast.MakeToast(图片上传成功").Show();} I have image upload feature in my Xamarin.iOS application. I have stored this uploaded image(s) in firebase storage. My files gets uploaded to firebase storage successfully, but the issue is:
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.
Code to upload image on firebase storage:
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);
}
After first image get uploaded, image get uploaded successfully but when handler gets called it gives this response:
But after this when I upload 2nd image that time it give Firebase.Storage.StorageReference1 in response:
Means if there are two images then only it returns url reference. How to fix this issue?
I have already added rules_version = '2'; in storage rules.
Haven't got the solution for listAll() but I have got the work around for this problem.
What I was trying is to get all the images from firebase storage using listAll(), but in that I am getting this issue. So now instead of listAll() I am using PutData() method's completion handler.
The completion handler will provide you the Metadata of an uploaded image. From this meta data we can get image directly like this: metadata.Name
Here is how I have fix the problem by adding completion handler in UploadAdventurePhoto() method:
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();
}
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