Hot to load document from Azure Blob Storage

Following example demonstrates how to process documents fromΒ Azure Blob Storage.

public static void Run()
{
    string blobName = "sample.docx";
    string outputFilePath = "SignedSample";
    using (Stream stream = DownloadFile(blobName))
    {
        using (Signature signature = new Signature(stream))
        {
            QRCodeSignOptions options = new QRCodeSignOptions("JohnSmith")
            {
                EncodeType = QRCodeTypes.QR,
                Left = 100,
                Top = 100
            };
            // sign document to file
            signature.Sign(outputFilePath, options);
        }
    }
    Console.WriteLine("\nSource document signed successfully.\nFile saved at " + outputFilePath);
}

public static Stream DownloadFile(string blobName)
{
    CloudBlobContainer container = GetContainer();

    CloudBlob blob = container.GetBlobReference(blobName);
    MemoryStream memoryStream = new MemoryStream();
    blob.DownloadToStream(memoryStream);
    memoryStream.Position = 0;
    return memoryStream;
}

private static CloudBlobContainer GetContainer()
{
    string accountName = "***";
    string accountKey = "***";
    string endpoint = $"https://{accountName}.blob.core.windows.net/";
    string containerName = "***";

    StorageCredentials storageCredentials = new StorageCredentials(accountName, accountKey);
    CloudStorageAccount cloudStorageAccount = new CloudStorageAccount(
        storageCredentials, new Uri(endpoint), null, null, null);
    CloudBlobClient cloudBlobClient = cloudStorageAccount.CreateCloudBlobClient();

    CloudBlobContainer container = cloudBlobClient.GetContainerReference(containerName);
    container.CreateIfNotExists();

    return container;
}

More resources

GitHub Examples

You may easily run the code above and see the feature in action in ourΒ GitHub examples:

Free Online Apps

Along with the full-featured .NET library, we provide simple but powerful free online apps.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.