CODEWITHSUNDEEP
windowsazureblob
veda
veda

Reputation: 6594

Windows Azure: Creation of a file on cloud blob container

I am writing a program that will be executing on the cloud. The program will generate an output that should be written on to a file and the file should be saved on the blob container.

I don't have a idea of how to do that

Will this code 

FileStream fs = new FileStream(file, FileMode.Create);
        StreamWriter sw = new StreamWriter(fs);

generate a file named "file" on the cloud...

Oh.. then how to store the content to the blob..

Upvotes: 2

Views: 1583

Answers (1)

crthompson
crthompson

Reputation: 15865

Are you attempting to upload a Page blob or a Block blob? Usually block blobs are what are required, unless you are going to create a VM from the blob image, then a page blob is needed.

Something like this works however. This snippet taken from the most excellent Blob Transfer Utility Check it out for all your upload and download blob needs. (Just change the type from Block To Page if you need a VHD)

public void UploadBlobAsync(ICloudBlob blob, string LocalFile)
    {
        // The class currently stores state in class level variables so calling UploadBlobAsync or DownloadBlobAsync a second time will cause problems.
        // A better long term solution would be to better encapsulate the state, but the current solution works for the needs of my primary client.
        // Throw an exception if UploadBlobAsync or DownloadBlobAsync has already been called.
        lock (WorkingLock)
        {
            if (!Working)
                Working = true;
            else
                throw new Exception("BlobTransfer already initiated. Create new BlobTransfer object to initiate a new file transfer.");
        }

        // Attempt to open the file first so that we throw an exception before getting into the async work
        using (FileStream fstemp = new FileStream(LocalFile, FileMode.Open, FileAccess.Read)) { }

        // Create an async op in order to raise the events back to the client on the correct thread.
        asyncOp = AsyncOperationManager.CreateOperation(blob);

        TransferType = TransferTypeEnum.Upload;
        m_Blob = blob;
        m_FileName = LocalFile;

        var file = new FileInfo(m_FileName);
        long fileSize = file.Length;

        FileStream fs = new FileStream(m_FileName, FileMode.Open, FileAccess.Read, FileShare.Read);
        ProgressStream pstream = new ProgressStream(fs);
        pstream.ProgressChanged += pstream_ProgressChanged;
        pstream.SetLength(fileSize);
        m_Blob.ServiceClient.ParallelOperationThreadCount = 10;
        asyncresult = m_Blob.BeginUploadFromStream(pstream, BlobTransferCompletedCallback, new BlobTransferAsyncState(m_Blob, pstream));
    }

Upvotes: 1

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