rel=me » flex

Memory usage during file upload in AIR

admin — Sat, 29 Mar 2008 00:47:00 +0000

Uploading files in AIR is a little bit problematic these days.

Here is the code:

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" showStatusBar="false" 
  initialize="onInitialize(event)">  
 
  <mx:Script>
    [CDATA[
 
      import com.rwnage.s3.service.S3PostOptions;
      import flash.events.Event;
 
      public function onInitialize(event:Event):void {
        var accessKey:String = "0RXZ3R7Y034PA8VGNWR2";
        var bucketName:String = "rwnage_test";
        var objectName:String = "test_file";
        var contentType:String = "application/octet-stream";
        var secretAccessKey:String = "[PUT YOUR SECRET ACCESS KEY HERE]";      
 
        var postOptions:S3PostOptions = new S3PostOptions(bucketName, objectName, accessKey, 
          { contentType: contentType });
 
        var policy:String = postOptions.getPolicy();
        var signature:String = postOptions.getSignature(secretAccessKey, policy);
 
        html.htmlText = ' \
          '.s3.amazonaws.com/" method="post" enctype="multipart/form-data"> \
            Key to upload: '" />
 \
            Content-Type: contentType + '" />
 \
            '" /> \
            '" /> \
            '" /> \
            File:  
 \
             \
             \
          ';                                                     
      }
 
    ]]>
  mx:Script>
 
  <mx:HTML id="html" width="100%" height="100%" paddingLeft="20" paddingTop="20"/>
 
mx:WindowedApplication>

No I don’t normally use mx:script tags, its a test case.

Eventually it malloc fails and crashes. This issue is Mac only and also occurs during a FileReference (or File) upload.

Socket output progress in AIR

admin — Thu, 17 Jan 2008 19:22:00 +0000

Currently when using the flash.net.Socket api, there is no way to
determine that buffered data has been written to the socket. (The flush method is non-blocking and applies only to the actionscript socket buffer).

This is a follow-up to a previous post.

This issue does not arise when using the new File api (and writing to
files), since an event has been included in
flash.filesystem.FileStream: OutputProgressEvent.OUTPUT_PROGRESS

If this (or a similar) event could be added to the Socket api, it
would allow us to:

Send large amounts of data on a socket (without causing large memory
usage as data buffers in memory).
Measure the current progress of data being sent on the socket.

We came upon this limitation from using our AS3 http client library, and trying to send large
files as part of a multipart upload. However this issue would arise
when sending any significant amounts of data on a socket. For example, an FTP or bittorrent client would be impossible.

This issue has been discussed in other places, but is probably more
pressing now with the AIR releases.

Getting progress events on Socket *write* (not read)
FlexFTP – FTP Client in Flex using flash.net.Socket (see comment by mailboo)

Update: Vote on this bug (FP-6)

Updated airake to support AIR/Flex Beta 2

admin — Fri, 05 Oct 2007 05:06:00 +0000

I updated airake to support new AIR/Flex beta 2 build.

sudo gem update airake

I changed the fcsh tasks to:

rake fcsh:start
rake fcsh:stop
rake fcsh:restart