VB.NET UWP/WinRT Google Drive: Export File to Requested MIME Type (Export to PDF)

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Exports a Google Doc to the requested MIME type and returns the exported content. Please note that the exported content is limited to 10MB.
(Export only supports Google Docs) See https://developers.google.com/drive/v3/web/manage-downloads for a list of MIME types.

Documentation: https://developers.google.com/drive/v3/reference/files/export

Dim rest As New Chilkat.Rest
Dim success As Boolean

'   Provide a previously obtained OAuth2 access token.
Dim oauth2 As New Chilkat.OAuth2
oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN"
rest.SetAuthOAuth2(oauth2)

success = Await rest.ConnectAsync("www.googleapis.com",443,True,True)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


rest.AddQueryParam("mimeType","application/pdf")

'  First send the HTTP request.
success = Await rest.SendReqNoBodyAsync("GET","/drive/v3/files/1zvzpTHO1dM9vNKYxpmr4YrX7x_R6qiNGFb8WB8h9wuI/export")
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  Read the response header.  If the response status code is success, stream to the file.
'  Otherwise receive the error response text.
Dim statusCode As Integer = Await rest.ReadResponseHeaderAsync()
If (statusCode < 0) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If

If (statusCode <> 200) Then
    Debug.WriteLine("Received error response code: " & statusCode)
    '  Read the error response body.
    Dim sbErrResponse As New Chilkat.StringBuilder
    success = Await rest.ReadRespSbAsync(sbErrResponse)
    If (success <> True) Then
        Debug.WriteLine(rest.LastErrorText)
        Exit Sub
    End If

    Debug.WriteLine("Error response:" & sbErrResponse.GetAsString())
    Exit Sub
End If

'  Stream the response body to the output file.
Dim respBodyStream As New Chilkat.Stream
respBodyStream.SinkFile = "/someDirectoryPath/test.pdf"
success = Await rest.ReadRespBodyStreamAsync(respBodyStream,True)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If



Debug.WriteLine("Example Completed.")