(Excel) Azure Storage: Download Blob to File

See more Azure Cloud Storage Examples

Sample code to download an Azure blob to a file.

For more information, see https://docs.microsoft.com/en-us/rest/api/storageservices/get-blob

Download Excel Class Modules Chilkat Excel Class Modules

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim rest As Chilkat.Rest
Set rest = Chilkat.NewRest

' Connect to the Azure Storage Blob Service

bTls = True

port = 443

bAutoReconnect = True
' In this example, the storage account name is "chilkat".

success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect)
If (success <> True) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

' Provide Azure Cloud credentials for the REST call.
Dim azAuth As Chilkat.AuthAzureStorage
Set azAuth = Chilkat.NewAuthAzureStorage
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.

' Setup a file stream for the download
Dim fileStream As Chilkat.Stream
Set fileStream = Chilkat.NewStream
fileStream.SinkFile = "qa_output/starfish.jpg"

' Indicate that the call to FullRequestNoBody should send the response body
' to fileStream if the response status code is 200.
' If a non-success response status code is received, then nothing
' is streamed to the output file and the error response is returned by FullRequestNoBody.

expectedStatus = 200
Dim success As Boolean
success = rest.SetResponseBodyStream(expectedStatus,True,fileStream)

' The Azure blob container is "test", the file is "starfish.jpg"

responseStr = rest.FullRequestNoBody("GET","/test/starfish.jpg")
If (rest.LastMethodSuccess <> True) Then
    ' Examine the request/response to see what happened.
    Debug.Print "response status code = "; rest.ResponseStatusCode
    Debug.Print "response status text = "; rest.ResponseStatusText
    Debug.Print "response header: "; rest.ResponseHeader
    Debug.Print "response body (if any): "; responseStr
    Debug.Print "---"
    Debug.Print "LastRequestStartLine: "; rest.LastRequestStartLine
    Debug.Print "LastRequestHeader: "; rest.LastRequestHeader
    Exit Sub
End If

Debug.Print "Success."