VB.NET

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. VB.NET

Dim success As Boolean = False

' Azure File Service Example: Download a Binary File to Memory
' See:  https://docs.microsoft.com/en-us/rest/api/storageservices/get-file

' 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".
success = rest.Connect("chilkat.file.core.windows.net",port,bTls,bAutoReconnect)
If (success = False) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' Provide Azure Cloud credentials for the REST calls.
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 = "File"
' This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.XMsVersion = "2021-08-06"
success = rest.SetAuthAzureStorage(azAuth)

' Note: The application does not need to explicitly set the following
' headers: x-ms-date, Authorization.  These headers
' are automatically set by Chilkat.

' Send a GET request to download the file "penguins.jpg" to a BinData object.
' (The share name is "pip")
Dim bdFileContents As New Chilkat.BinData
success = rest.FullRequestNoBodyBd("GET","/pip/wildlife/antarctic/penguins.jpg",bdFileContents)
If (success = False) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' When successful, the response status will be 200.
' If a non-success status code is returned, then the bdFileContents actually contains the XML error message.
If (rest.ResponseStatusCode <> 200) 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)
    Dim sbXmlErr As New Chilkat.StringBuilder
    sbXmlErr.AppendBd(bdFileContents,"utf-8",0,0)
    Debug.WriteLine("response body (if any): " & sbXmlErr.GetAsString())
    Debug.WriteLine("---")
    Debug.WriteLine("LastRequestStartLine: " & rest.LastRequestStartLine)
    Debug.WriteLine("LastRequestHeader: " & rest.LastRequestHeader)
    Exit Sub
End If


Debug.WriteLine("Size of the downloaded file = " & bdFileContents.NumBytes)

' See the online reference documentation for the BinData class for ways
' to access the bytes.

bdFileContents.WriteFile("qa_output/penguins.jpg")