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VB.NET UWP/WinRT Examples

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(VB.NET UWP/WinRT) Glacier Download Archive

Demonstrates how to download an Amazon Glacier archive. Downloading a Glacier archive is a two step process. First an archive retrieval job is initiated. After it completes, the job output is downloaded (i.e. the archive contents are downloaded.)

Note: This example requires Chilkat v9.5.0.78 or greater.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

' 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 Amazon AWS REST server in the desired region.
Dim bTls As Boolean = True
Dim port As Integer = 443
Dim bAutoReconnect As Boolean = True
Dim success As Boolean = Await rest.ConnectAsync("glacier.us-west-2.amazonaws.com",port,bTls,bAutoReconnect)

' Provide AWS credentials.
Dim authAws As New Chilkat.AuthAws
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
authAws.ServiceName = "glacier"
authAws.Region = "us-west-2"

success = rest.SetAuthAws(authAws)

' --------------------------------------------------------------------------
' Note: The above REST connection and setup of the AWS credentials
' can be done once.  After connecting, any number of REST calls can be made.
' The "auto reconnect" property passed to rest.Connect indicates that if
' the connection is lost, a REST method call will automatically reconnect
' if needed.
' --------------------------------------------------------------------------

' 
' For more information, see Glacier Retrieve Job Output Reference Documentation
' 
rest.AddHeader("x-amz-glacier-version","2012-06-01")

' To download an archive, we'll make several method calls:
' 1) Send the HTTPS GET request.
' 2) Get the response body.
' 3) If the response status code indicates success, stream the response body (i.e the archive data) to a file.
' 4) If the response status code indicates an error, get the JSON error response.

' Send the GET request.
success = Await rest.SendReqNoBodyAsync("GET","/AWS_ACCOUNT_ID/vaults/chilkat/jobs/JOB_ID/output")
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' Read the response header.
Dim responseStatusCode As Integer = Await rest.ReadResponseHeaderAsync()
If (responseStatusCode < 0) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Response status code = " & responseStatusCode)

' We expect a 200 response status if the archive data is coming.
' Otherwise, we'll get a JSON response body with an error message(or no response body).
If (responseStatusCode = 200) Then

    Dim bodyStream As New Chilkat.Stream

    ' The stream's sink will be a file.
    bodyStream.SinkFile = "qa_output/archiveData.dat"

    ' Read the response body to the stream.
    success = Await rest.ReadRespBodyStreamAsync(bodyStream,True)
    If (success <> True) Then
        Debug.WriteLine(rest.LastErrorText)
        Exit Sub
    End If


    Debug.WriteLine("Successfully received the archive file.")

Else
    Dim jsonError As String = Await rest.ReadRespBodyStringAsync()
    If (rest.LastMethodSuccess <> True) Then
        Debug.WriteLine(rest.LastErrorText)
    Else
        Debug.WriteLine(jsonError)
    End If

End If


 

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