Xojo Plugin

(using AWS Signature Version 2) Streaming Download to File

See more Amazon S3 (new) Examples

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. Xojo Plugin

Dim success As Boolean
success = False

// 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:
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