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(VB.NET UWP/WinRT) Azure Storage: Upload Empty File to Block BlobDemonstrates how to create an empty block blob in Azure Storage.
' Azure Blob Service Example: Demonstrates how to create an empty block blob. ' See also: https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx ' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim rest As New Chilkat.Rest ' Connect to the Azure Storage Blob Service Dim bTls As Boolean = True Dim port As Integer = 443 Dim bAutoReconnect As Boolean = True ' In this example, the storage account name is "chilkat". Dim success As Boolean = Await rest.ConnectAsync("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect) If (success <> True) Then Debug.WriteLine(rest.LastErrorText) Exit Sub End If ' Provide Azure Cloud credentials for the REST call. Dim azAuth As New Chilkat.AuthAzureStorage azAuth.AccessKey = "AZURE_ACCESS_KEY" ' The account name used here should match the 1st part of the domain passed in the call to Connect (above). azAuth.Account = "chilkat" azAuth.Scheme = "SharedKey" azAuth.Service = "Blob" ' This causes the "x-ms-version: 2020-08-04" header to be automatically added. azAuth.XMsVersion = "2020-08-04" success = rest.SetAuthAzureStorage(azAuth) ' Note: The application does not need to explicitly set the following ' headers: Content-Length, x-ms-date, Authorization. These headers ' are automatically set by Chilkat. ' IMPORTANT: Make sure to set the x-ms-blob-type header: success = rest.AddHeader("x-ms-blob-type","BlockBlob") ' To create an empty blob, upload a zero-length string. Dim responseStr As String = Await rest.FullRequestStringAsync("PUT","/mycontainer/empty.txt","") If (rest.LastMethodSuccess <> True) Then Debug.WriteLine(rest.LastErrorText) Exit Sub End If ' When successful, the Azure Storage service will respond with a 201 response status code, ' with no response body. If (rest.ResponseStatusCode <> 201) Then ' Examine the request/response to see what happened. Debug.WriteLine("response status code = " & rest.ResponseStatusCode) Debug.WriteLine("response status text = " & rest.ResponseStatusText) Debug.WriteLine("response header: " & rest.ResponseHeader) Debug.WriteLine("response body (if any): " & responseStr) Debug.WriteLine("---") Debug.WriteLine("LastRequestStartLine: " & rest.LastRequestStartLine) Debug.WriteLine("LastRequestHeader: " & rest.LastRequestHeader) Exit Sub End If Debug.WriteLine("Success.") |
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