GmailAttachment copyBlob() confusion

[Harry Hoffman]

Hi Folks,

Hoping someone can have a look and tell me what I'm doing wrong. I'm trying to parse Gmail messages and when finding a gzip'd file use Utilities.ungzip to decompress and then parse the contents. I'm trying to get the attachment as a blob with this code

var attachment = files[k];

var attachmentBlob = attachment.copyBlob();

If I look at the console log output while running the code attachment and attachmentBlob both look to actually be GmailAttachment objects.

What am I doing wrong?

Code is below:

function getRelevantMessages()

{

  var threads = GmailApp.search("newer_than:1d",0,100);

  var messages=[];

  threads.forEach(function(thread)

  {

    messages.push(thread.getMessages()[0]);

  });

  return messages;

}

function parseMessageData(messages)

{

  var records=[];

  if(!messages)

  {

    console.log("No messages returned");

    return records;

   }

   for(var m=0;m < messages.length;m++)

   {

      var date = messages[m].getDate();

      var from = messages[m].getFrom();

      var subj = messages[m].getSubject();

      var recip = messages[m].getTo();

      var text = messages[m].getPlainBody();

      var files = messages[m].getAttachments();

       if (files)

      {

         //console.log("Files found");

        for (var k in files)

       {

          var attachment = files[k];

          var attachmentBlob = attachment.copyBlob();

          var file_name = attachment.getName();

          if ( file_name.match(/\.gz/) )

         {

            uncompressedBlob = Utilities.ungzip(attachmentBlob);

          }

      }

   }

  var origFrom = text.match(/From:\s+.*\<(.*)\>.*$\r\n/m)[1];

}

function doGet()

{

   var messages = getRelevantMessages();

   parseMessageData(messages);

}