(Xojo Plugin) (using AWS Signature Version 2) Streaming Download to File

The main purpose of this example is to demonstrate how to use the older Signature Version 2 authentication w/ S3. It uses V2 authentication to download a file.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// 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.
Dim bTls As Boolean
bTls = True
Dim port As Int32
port = 443
Dim bAutoReconnect As Boolean
bAutoReconnect = True
// The file is located in the bucket named "chilkat100", which becomes part of the domain:
Dim success As Boolean
success = rest.Connect("chilkat100.s3.amazonaws.com",port,bTls,bAutoReconnect)

// Provide AWS credentials for the REST call.
Dim authAws As New Chilkat.AuthAws
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
authAws.ServiceName = "s3"

// For AWS Signature Version 2, the following two properties need to be set:
authAws.SignatureVersion = 2
// See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
authAws.CanonicalizedResourceV2 = "/chilkat100/starfish.jpg"

success = rest.SetAuthAws(authAws)

// Send the request to download the JPG.
success = rest.SendReqNoBody("GET","/starfish.jpg")
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

// Read the response header.
Dim responseStatusCode As Int32
responseStatusCode = rest.ReadResponseHeader()
If (responseStatusCode < 0) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

System.DebugLog("Response status code = " + Str(responseStatusCode))

// We expect a 200 response status if the JPG data is coming.
// Otherwise, we'll get a string 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/starfish.jpg"

    // Read the response body to the stream.  Given that we've
    // set the stream's sink to a file, it will stream directly
    // to the file.
    success = rest.ReadRespBodyStream(bodyStream,True)
    If (success <> True) Then
        System.DebugLog(rest.LastErrorText)
        Return
    End If

    System.DebugLog("Successfully received the JPG file.")

Else
    Dim errResponse As String
    errResponse = rest.ReadRespBodyString()
    If (rest.LastMethodSuccess <> True) Then
        System.DebugLog(rest.LastErrorText)
    Else
        System.DebugLog(errResponse)
    End If

End If