I am presently working with windows 10 universal application, here i am working with azure storage.
I am getting above error when i downloading file file from windows azure storage.
Here is my download code:
private async Task<int> DownloadFromAzureStorage()
{
try
{
// create Azure Storage
CloudStorageAccount storageAccount = CloudStorageAccount.Parse("DefaultEndpointsProtocol=https;AccountName=<myaccname>;AccountKey=<mykey>");
// create a blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// create a container
CloudBlobContainer container = blobClient.GetContainerReference("sample");
await container.CreateIfNotExistsAsync();
// create a block blob
CloudBlockBlob blockBlob = container.GetBlockBlobReference("abc.jpg");
FileSavePicker openPicker = new FileSavePicker();
openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
openPicker.FileTypeChoices.Add("File", new List<string>() { ".jpg" });
openPicker.SuggestedFileName = "New Documents";
var imgFile = await openPicker.PickSaveFileAsync();
await blockBlob.DownloadToFileAsync(imgFile); **//Error occuring in this line**
return 1;
}
catch
{
// return error
return 0;
}
}
File Uploading to my azure storage is success, but when i download to my uploaded my it showing the error is "An unhandled exception of type 'System.StackOverflowException' occurred in Microsoft.WindowsAzure.Storage.dll" in await blockBlob.DownloadToFileAsync(imgFile); Line
please help me to resolve this issue..
This is a known issue with the DownloadToFileAsync() method in the Win10 Universal Storage Client (unfortunately). The bug is fixed in the current preview release (7.0.2-preview), and will be fixed in an upcoming non-preview release. To fix your issue for now, please change your DownloadToFile call to the following:
await blockBlob.DownloadToFileAsync(imgFile, null, null, null, CancellationToken.None);
Related
I am using Azure storage blob to store image and I am trying to display it in my Xamrin.form application. I have find a simple tutorial and the code on github.
I have succeed to implement it by following the steps and and create an account on azure storage blob.
The problem is : I can see the name of the file but not the "image"
here is the error:
read started: <Thread Pool> #9
[0:] HTTP Request: Could not retrieve https://xxxxxx.blob.core.windows.net/yyyy/kakashi.jpg, status code NotFound
[0:] ImageLoaderSourceHandler: Could not retrieve image or image data was invalid: Uri: https://lxxxxxx.blob.core.windows.net/yyyy/kakashi.jpg
Thread finished: <Thread Pool> #4
Here is the tutorial:
click to see
Here is the Github:
click to see
Here is the output on screen:
and I have this error when I put the Urlof the image (https://lxxxxxx.blob.core.windows.net/yyyy/kakashi.jpg
) on my bronwser:
This XML file does not appear to have any style information associated with it. The document tree is shown below.
<Error>
<Code>ResourceNotFound</Code>
<Message>
The specified resource does not exist. RequestId:97933c69-a01e-014f-6669-f0502e000000 Time:2018-05-20T18:33:28.4774584Z
</Message>
</Error>
The error means you don't set Public access level to Blob.
See this requirement in your tutorial.
Code you use requires this setting, because it accesses the blob directly using blob Uri.
See PhotosBlobStorageService.cs
return blobList.Select(x => new PhotoModel { Title = x.Name, Uri = x.Uri }).ToList();
If you do want to keep Private level, you have to make some changes to the statement above. Here's the reference.
return blobList.Select(x => new PhotoModel { Title = x.Name,
Uri = new Uri(x.Uri+x.GetSharedAccessSignature(
new SharedAccessBlobPolicy {
Permissions = SharedAccessBlobPermissions.Read|SharedAccessBlobPermissions.Write,
// you can modify the expiration to meet your requirement
SharedAccessExpiryTime = DateTime.UtcNow.AddYears(1)
} ))
}).ToList();
This change allows you to visit private blob with a SAS.
1.Please check your subscription first.
2.Check the access policy of your container.
3.Here is the steps to Save and get blobs through the code.
1)Using NuGet we can install required Assembly packages.
Go to "Manage Package for Solution Menu" and search for WindowsAzure.Storage and WindowsAzure.ConfigurationManager and click on install.
2)Get access keys in the configuration.
3)Sample code to Create blob through the code:
public async Task<string> SaveImagesToAzureBlob(HttpPostedFileBase imageToUpload)
{
try
{
CloudStorageAccount cloudStorageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));
CloudBlobClient cloudBlobClient = cloudStorageAccount.CreateCloudBlobClient();
CloudBlobContainer cloudBlobContainer = cloudBlobClient.GetContainerReference("sampleimage");
if (await cloudBlobContainer.CreateIfNotExistsAsync())
{
await cloudBlobContainer.SetPermissionsAsync(
new BlobContainerPermissions
{
PublicAccess = BlobContainerPublicAccessType.Blob
}
);
}
string imageFullPath = null;
string imageName = Guid.NewGuid().ToString() + "-" + Path.GetExtension(imageToUpload.FileName);
CloudBlockBlob cloudBlockBlob = cloudBlobContainer.GetBlockBlobReference(imageName);
cloudBlockBlob.Properties.ContentType = imageToUpload.ContentType;
await cloudBlockBlob.UploadFromStreamAsync(imageToUpload.InputStream);
imageFullPath = cloudBlockBlob.Uri.ToString();
return imageFullPath;
}
catch (Exception ex)
{
throw ex;
}
}
Now, check your storage account, you can see the container sample generated.
By default, the container will be private, no one can access from outside. To set the permissions we should use the SetPermission method as below.
CloudBlobContainer .SetPermissions( new BlobContainerPermissions { PublicAccess = BlobContainerPublicAccessType.Blob });
Please try different permissions in the list.
Please note the permission level settings.In your case it may cause the issue.
For more details :
Reference
https://learn.microsoft.com/en-us/azure/azure-resource-manager/resource-manager-deployment-model
https://learn.microsoft.com/en-us/azure/storage/blobs/storage-dotnet-how-to-use-blobs
I am trying to create a webjob with blog trigger and my motive to create to automate some process whenever new blog uploaded in container.
i have write few line of code to test weather my webjob is working or not,but it's not working and throwing below error:
Microsoft.WindowsAzure.Storage.StorageException was unhandled
HResult=-2146233088
Message=The remote server returned an error: (400) Bad Request.
Can you help me to short out the issue:
I am attaching snapshot whatever i write to achieve this.
Please see snap shot
I am not able to repro the issue. Look at the below code sample which works fine for me.
static void Main()
{
CreateDemoData();
// The connection string is read from App.config
JobHost host = new JobHost();
host.RunAndBlock();
}
private static void CreateDemoData()
{
string connectionString = AmbientConnectionStringProvider.Instance.GetConnectionString(ConnectionStringNames.Storage);
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference("input");
container.CreateIfNotExists();
CloudBlockBlob blob = container.GetBlockBlobReference("BlobOperations.txt");
blob.UploadText("Hell!");
CloudQueueClient queueClient = storageAccount.CreateCloudQueueClient();
CloudQueue queue = queueClient.GetQueueReference("persons");
queue.CreateIfNotExists();
Person person = new Person()
{
Name = "Mohit",
Age = 30
};
queue.AddMessage(new CloudQueueMessage(JsonConvert.SerializeObject(person)));
}
Reference to Git Hub Project: Microsoft Azure WebJobs SDK Samples
I have created container on azure storage and with code below made it work to upload my files(blobs) in container. Now it says upload was successful however I can't figure out how to reach those files to download it. There is no documentation on the internet about it.
Any help would be appreciated to solve it.
// create Azure Storage
CloudStorageAccount storageAccount = CloudStorageAccount.Parse("DefaultEndpointsProtocol=https;AccountName=bireddy;AccountKey=8OMbjBeJR+SIYaSt0YtBUzivLKPX5ZbsGJeEY9vsX0BPbX3uy9KxOckK7LuLeH3ZbOh+NoEaiEIV/NWvZbFOrA==");
// create a blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// create a container
CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");
// make it public
container.SetPermissions(
new BlobContainerPermissions {
PublicAccess = BlobContainerPublicAccessType.Container
});
// create a block blob
CloudBlockBlob blockBlob = container.GetBlockBlobReference(FileUpload1.FileName);
// upload to Azure Storage
// this has to be changed sometime later
blockBlob.Properties.ContentType = FileUpload1.PostedFile.ContentType;
blockBlob.UploadFromStream(FileUpload1.FileContent);
Grateful to your discussion.
There are a number of options to download your blobs:
Using PowerShell: See the Azure Storage Powershell guide here:
http://azure.microsoft.com/en-us/documentation/articles/storage-powershell-guide-full/
Using Command Line: See the documentation for the AzCopy tool here:
http://aka.ms/azcopy
Using your C# code: There is a guide here, that includes a section on how to download blobs:
http://azure.microsoft.com/en-us/documentation/articles/storage-dotnet-how-to-use-blobs/
Using GUI-based explorers: There are a number of third-party explorers, some of them are listed here:
http://blogs.msdn.com/b/windowsazurestorage/archive/2014/03/11/windows-azure-storage-explorers-2014.aspx
// Parse the connection string and return a reference to the storage account.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));
//Create the Blob service client
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve a reference to a container.
CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");
// Retrieve reference to a blob named
CloudBlockBlob blockBlob2 = container.GetBlockBlobReference(document);
//using (var np = File.Open(#"C:\mydocuments\"+ document, FileMode.Create))
// blockBlob2.DownloadToStream(np, null, options, null);
byte[] fileBytes;
using (var fileStream = new MemoryStream())
{
blockBlob2.DownloadToStream(fileStream, null, options, null);
fileBytes = fileStream.ToArray();
}
return fileBytes;
I've been trying to create a Windows Azure Blob containing an image file. I followed these tutorials: http://www.nickharris.net/2012/11/how-to-upload-an-image-to-windows-azure-storage-using-mobile-services/ and http://www.windowsazure.com/en-us/develop/mobile/tutorials/upload-images-to-storage-dotnet/. Finally the following code represents a merging of them. On the last line, however, an exception is raised:
An exception of type 'System.TypeLoadException' occurred in
mscorlib.ni.dll but was not handled in user code
Additional information: A binding for the specified type name was not
found. (Exception from HRESULT: 0x80132005)
Even the container is created the table, but It doesn't work properly.
private async void SendPicture()
{
StorageFile media = await StorageFile.GetFileFromPathAsync("fanny.jpg");
if (media != null)
{
//add todo item to trigger insert operation which returns item.SAS
var todoItem = new Imagem()
{
ContainerName = "mypics",
ResourceName = "Fanny",
ImageUri = "uri"
};
await imagemTable.InsertAsync(todoItem);
//Upload image direct to blob storage using SAS and the Storage Client library for Windows CTP
//Get a stream of the image just taken
using (var fileStream = await media.OpenStreamForReadAsync())
{
//Our credential for the upload is our SAS token
StorageCredentials cred = new StorageCredentials(todoItem.SasQueryString);
var imageUri = new Uri(todoItem.SasQueryString);
// Instantiate a Blob store container based on the info in the returned item.
CloudBlobContainer container = new CloudBlobContainer(
new Uri(string.Format("https://{0}/{1}",
imageUri.Host, todoItem.ContainerName)), cred);
// Upload the new image as a BLOB from the stream.
CloudBlockBlob blobFromSASCredential =
container.GetBlockBlobReference(todoItem.ResourceName);
await blobFromSASCredential.UploadFromStreamAsync(fileStream.AsInputStream());
}
}
}
Please use Assembly Binding Log Viewer to see which load is failing. As also mentioned in the article, the common language runtime's failure to locate an assembly typically shows up as a TypeLoadException in your application.
I am trying to rename blob in azure storage via .net API and it is I am unable to rename a blob file after a day : (
Here is how I am doing it, by creating new blob and copy from old one.
var newBlob = blobContainer.GetBlobReferenceFromServer(filename);
newBlob.StartCopyFromBlob(blob.Uri);
blob.Delete();
There is no new blob on server so I am getting http 404 Not Found exception.
Here is working example that i have found but it is for old .net Storage api.
CloudBlob blob = container.GetBlobReference(sourceBlobName);
CloudBlob newBlob = container.GetBlobReference(destBlobName);
newBlob.UploadByteArray(new byte[] { });
newBlob.CopyFromBlob(blob);
blob.Delete();
Currently I am using 2.0 API. Where I am I making a mistake?
I see that you're using GetBlobReferenceFromServer method to create an instance of new blob object. For this function to work, the blob must be present which will not be the case as you're trying to rename the blob.
What you could do is call GetBlobReferenceFromServer on the old blob, get it's type and then either create an instance of BlockBlob or PageBlob and perform copy operation on that. So your code would be something like:
CloudBlobContainer blobContainer = storageAccount.CreateCloudBlobClient().GetContainerReference("container");
var blob = blobContainer.GetBlobReferenceFromServer("oldblobname");
ICloudBlob newBlob = null;
if (blob is CloudBlockBlob)
{
newBlob = blobContainer.GetBlockBlobReference("newblobname");
}
else
{
newBlob = blobContainer.GetPageBlobReference("newblobname");
}
//Initiate blob copy
newBlob.StartCopyFromBlob(blob.Uri);
//Now wait in the loop for the copy operation to finish
while (true)
{
newBlob.FetchAttributes();
if (newBlob.CopyState.Status != CopyStatus.Pending)
{
break;
}
//Sleep for a second may be
System.Threading.Thread.Sleep(1000);
}
blob.Delete();
The code in OP was almost fine except that an async copy method was called. The simplest code in new API should be:
var oldBlob = cloudBlobClient.GetBlobReferenceFromServer(oldBlobUri);
var newBlob = container.GetBlobReference("newblobname");
newBlog.CopyFromBlob(oldBlob);
oldBlob.Delete();