重要提示:我发现了同样的问题,但它因不完整的调试信息而关闭。
我正在将图片上传到 Firebase 存储,然后获取该图片的下载网址并将其存储到 Firebase,以便使用该网址通过网络图片显示用户的个人资料图片。
以前当我存储图像时它工作正常,例如
Reference storageRef = FirebaseStorage.instance.ref('images');
file = await _compressImage(file: file,);
await storageRef.putFile(file);
final String downloadUrl = await storageRef.child(id).getDownloadURL();
return downloadUrl;
但是在我将图像存储在特定文件夹中之后
Reference storageRef = FirebaseStorage.instance.ref('images');
file = await _compressImage(file: file, id: id);
await storageRef
.child(Get.find<UserController>().user.username)
.child(id)
.putFile(file);
final String downloadUrl = await storageRef.child(id).getDownloadURL();
return downloadUrl;
它显示此错误。
[firebase_storage/object-not-found] No object exists at the desired reference.
这是可解释的代码:我将可下载的URL存储在newImage变量中
String newImage;
if (_controller.file != null) {
newImage = await Database().uploadFile(
file: _controller.file,
id: Get.find<UserController>().user.username);
print("new image: " + newImage.toString());
}
但是在这里,当我打印 newImage 的值时,它将空打印到控制台。
new image: null
这是将图片上传到Firebase存储的第二种方法。
Future<String> uploadFile({@required File file, @required String id}) async {
try {
file = await _compressImage(file: file, id: id);
await storageRef
.child(Get.find<UserController>().user.username)
.child(id)
.putFile(file);
final String downloadUrl = await storageRef.child(id).getDownloadURL();
return downloadUrl;
} catch (e) {
print(e);
}
}
调试控制台:
E/StorageException(11376): StorageException has occurred.
E/StorageException(11376): Object does not exist at location.
E/StorageException(11376): Code: -13010 HttpResult: 404
E/StorageException(11376): { "error": { "code": 404, "message": "Not Found. Could not get object", "status": "GET_OBJECT" }}
E/StorageException(11376): java.io.IOException: { "error": { "code": 404, "message": "Not Found. Could not get object", "status": "GET_OBJECT" }}
E/StorageException(11376): at com.google.firebase.storage.network.NetworkRequest.parseResponse(NetworkRequest.java:434)
E/StorageException(11376): at com.google.firebase.storage.network.NetworkRequest.parseErrorResponse(NetworkRequest.java:451)
E/StorageException(11376): at com.google.firebase.storage.network.NetworkRequest.processResponseStream(NetworkRequest.java:442)
E/StorageException(11376): at com.google.firebase.storage.network.NetworkRequest.performRequest(NetworkRequest.java:272)
E/StorageException(11376): at com.google.firebase.storage.network.NetworkRequest.performRequest(NetworkRequest.java:286)
E/StorageException(11376): at com.google.firebase.storage.internal.ExponentialBackoffSender.sendWithExponentialBackoff(ExponentialBackoffSender.java:70)
E/StorageException(11376): at com.google.firebase.storage.internal.ExponentialBackoffSender.sendWithExponentialBackoff(ExponentialBackoffSender.java:62)
E/StorageException(11376): at com.google.firebase.storage.GetDownloadUrlTask.run(GetDownloadUrlTask.java:76)
E/StorageException(11376): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
E/StorageException(11376): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
E/StorageException(11376): at java.lang.Thread.run(Thread.java:764)
I/flutter (11376): [firebase_storage/object-not-found] No object exists at the desired reference.
I/flutter (11376): new image: null
但是当我检查火力存储并且图像在那里成功上传时。
我所知道的是,图像已成功上传到Firebase存储,但是上述方法在上传图像之前以某种方式返回了一个可关闭的URL。
对我有用的东西有点出乎意料。 首先,我有这样的代码,这是有多少个例子。
Reference reference = storage.ref(filePath);
UploadTask uploadTask = reference.putFile(imageToUpload);
final storageSnapshot = uploadTask.snapshot;
final downloadUrl = await storageSnapshot.ref.getDownloadURL();
然后,我决定玩弄它。 我注意到如果我等待 putFile 调用,它会更改返回类型,即使它不是将来。
Reference reference = storage.ref(filePath);
final TaskSnapshot snapshot = await reference.putFile(imageToUpload);
final downloadUrl = await snapshot.ref.getDownloadURL();
你知道什么,这奏效了!很奇怪,考虑到您可以等待 putFile 调用并不明显。
以下是我们的做法
Reference ref = FirebaseStorage.instance
.ref()
.child('user_Image')
.child('${authResult.user?.uid}.jpg');
UploadTask uploadTask = ref.putFile(imageUser);
final snapshot = await uploadTask.whenComplete(() => null);
final urlImageUser = await snapshot.ref.getDownloadURL();
我浪费了很多小时与您和 IDK 相同的问题,但它通过使用它之前创建引用来工作:
final FirebaseStorage feedStorage =
FirebaseStorage.instanceFor(bucket: F.feedBucket);
Reference refFeedBucket = feedStorage
.ref()
.child('venues')
.child(auth.user.uid)
.child('vibes')
.child(p.basename(file.path));
String downloadUrl;
TaskSnapshot uploadedFile = await refFeedBucket.putFile(file);
if (uploadedFile.state == TaskState.success) {
downloadUrl = await refFeedBucket.getDownloadURL();
}
return downloadUrl;
试试这个 用于从火力基地加载图片
Future<String> downloadedUrl(String imageName) async {
String downloadedUrl =
await storage.ref('$imageName').getDownloadURL();
return downloadedUrl;
}
就我而言,我在路上弄错了单词大小写的大小写。
Firebase 存储Case sensitive
请检查一下!
根据我在这里的理解,这里的问题是
final String downloadUrl = await storageRef.child(id).getDownloadURL();
在完成上传文件任务之前命中,结果返回异常,
firebase_storage object-not-found No object exists at the desired reference flutter
如果我们遍历Storage
的所有功能,我们有另一种方法可以帮助我们知道任务是否完成,我们可以添加 await,然后点击getDownloadURL
以获取 URL。
try {
String name = DateTime.now().millisecondsSinceEpoch.toString() + file.name;
Reference reference = _firebaseStorage.ref(FirebaseKey.images).child(name);
final metadata = SettableMetadata(
contentType: 'image/jpeg',
customMetadata: {'picked-file-path': file.path},
);
UploadTask task;
if (kIsWeb) {
task = reference.putData(await file.readAsBytes(), metadata);
} else {
task = reference.putFile(File(file.path), metadata);
}
/// wait for task completion
TaskSnapshot taskSnapshot = await task.whenComplete(() => {debugPrint('Task completed')});
return taskSnapshot.ref.getDownloadURL();
} on FirebaseException catch (e, stackTrace) {
debugPrint('Exception: on $e $stackTrace');
rethrow;
} catch (e, stackTrace) {
debugPrint('Exception: catch $e $stackTrace');
rethrow;
}
不要忘记在 Firebase Storage 中创建特定文件夹并允许对其进行读/写访问。
这是一个对我有用的示例规则:
service firebase.storage {
match /b/{bucket}/o {
match /profile_pictures/{allPaths=**} {
allow read, write;
}
}
}
我花了很多时间自己解决这个查询,实际上这个解决方案非常简单。
我只需要"等待"我之前发送的一些请求,用于将图像存储到 firebase 存储。
此外,等待getdownloadurl() mehtod也是必要的。
下面是之前和之后的示例代码
之前:
final firebaseimageupload = FirebaseStorage.instance.ref().child('user_images').child('${userCredentials.user!.uid}.jpg'); firebaseimageupload.putFile(_selectedimage!); final imageurl = firebaseimageupload.getDownloadURL();
后:
final firebaseimageupload = FirebaseStorage.instance.ref().child('user_images').child('${userCredentials.user!.uid}.jpg');
await firebaseimageupload.putFile(_selectedimage!);
final imageurl = await firebaseimageupload.getDownloadURL();