(Visual Basic 6.0) REST Stream Response to File (Streaming Download) (Amazon S3)

Demonstrates how to stream the response body directly to a file. (The example shows how to stream a JPG from the Amazon S3 service.)

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim rest As New ChilkatRest

'  Connect to the Amazon AWS REST server.
Dim bTls As Long
bTls = 1
Dim port As Long
port = 443
Dim bAutoReconnect As Long
bAutoReconnect = 1
Dim success As Long
success = rest.Connect("s3.amazonaws.com",port,bTls,bAutoReconnect)

'  Provide AWS credentials for the REST call.
Dim authAws As New ChilkatAuthAws
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
authAws.ServiceName = "s3"
success = rest.SetAuthAws(authAws)

'  Set the bucket name via the HOST header.
'  In this case, the bucket name is "chilkat100".
rest.Host = "chilkat100.s3.amazonaws.com"

'  Send the request to download the JPG.
success = rest.SendReqNoBody("GET","/starfish.jpg")
If (success <> 1) Then
    Text1.Text = Text1.Text & rest.LastErrorText & vbCrLf
    Exit Sub
End If

'  Read the response header.
Dim responseStatusCode As Long
responseStatusCode = rest.ReadResponseHeader()
If (responseStatusCode < 0) Then
    Text1.Text = Text1.Text & rest.LastErrorText & vbCrLf
    Exit Sub
End If

Text1.Text = Text1.Text & "Response status code = " & responseStatusCode & vbCrLf

'  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 ChilkatStream

    '  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,1)
    If (success <> 1) Then
        Text1.Text = Text1.Text & rest.LastErrorText & vbCrLf
        Exit Sub
    End If

    Text1.Text = Text1.Text & "Successfully received the JPG file." & vbCrLf

Else
    Dim errResponse As String
    errResponse = rest.ReadRespBodyString()
    If (rest.LastMethodSuccess <> 1) Then
        Text1.Text = Text1.Text & rest.LastErrorText & vbCrLf
    Else
        Text1.Text = Text1.Text & errResponse & vbCrLf
    End If

End If