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From eRoom-D <ero...@gmail.com>
Subject Re: SFTP file transfer for large files using flex
Date Wed, 28 Mar 2012 19:29:12 GMT
First post here, but since I just wrote a file upload section for an
enterprise application I thought I might be able to shed a little more
light on the issue.

Flash player can upload more than 100Mb at a time, though as was mentioned
earlier only 100Mb is officially supported.

The other issue, that Avinash Y may be running into is a server side
limitation on uploads. I know that for our Java server we needed to have
it's configuration changed to allow larger files uploaded. If that isn't
changed, then the server has it's own timeouts that file uploads would run
into and the larger files would fail during the upload.

Thanks,

David

Flash and Flex Developer - http://vandermore.com


On Wed, Mar 28, 2012 at 2:04 PM, JP Bader <jp@zavteq.com> wrote:

> I might be off, but I don't think an ANE is, or would be, part of
> Flex.  It is an extension for AIR, which is still controlled by Adobe.
>  If we want to see about spawning new threads that could consume a
> massive dump of data files, process, and pass those into a service
> (FTP/SFTP/REST/Telnet/etc), that seems like a bit outside of scope of
> the Flex project, and more in line w/ Tamarin.
>
> We are working on the framework, which currently has limitations to
> the FP and AIR (which are Adobe).  Potentially once we have access to
> Falcon(JS), there might be alternatives, but my question is, what 2GB
> file are you trying to have FP/AIR upload?  There might be some tricks
> to chunking out the flow of data using byte arrays, and clearing them
> out as you go along with loading them to whatever repository/location
> you need, but I can't think of too many desktop applications that will
> not just freeze up when you load a 2GB (or any major file) into it.
> For video, that's one thing, but beyond a certain size, and normally
> the machine itself will slow down/become unresponsive.
>
> Most enterprises where I have done work, accessing and uploading
> massive amounts of data would be FTP via terminals or clients, not
> through a separate app (especially not AIR).  Maybe I'm missing the
> reason behind wanting FP/AIR to handle that much data, but given the
> limitations of FP/AIR for processing data, I am not sure how you would
> approach building that into the framework.  I guess examples of
> BigAssCanvas show that you could stitch together large files (larger
> than FP would allow), but once you get to a certain size, it becomes
> unresponsive.
>
> If there is a way to do it, I apologize for going off tangent, but we
> need to focus on getting bugs fixed and improving the framework first,
> and I'm not sure this is an improvement of the current framework so
> much as a nice feature request.
>
> Regards,
>
> On Wed, Mar 28, 2012 at 1:14 PM, Ariel Jakobovits <arieljake@yahoo.com>
> wrote:
> > would we consider developing ANEs to incorporate into Flex?
> >
> > Ariel Jakobovits
> > Email: arieljake@yahoo.com
> > Phone: 650-690-2213
> > Fax: 650-641-0031
> > Cell: 650-823-8699
> >
> >
> > ________________________________
> >  From: Marcus Fritze <marcus.fritze@googlemail.com>
> > To: flex-dev@incubator.apache.org; Marcus Fritze <
> marcus.fritze@googlemail.com>
> > Sent: Wednesday, March 28, 2012 10:34 AM
> > Subject: Re: SFTP file transfer for large files using flex
> >
> > Hi,
> >
> > as maybe all know Flash supports only a file size of 100MB.
> >
> > from the docs:
> >
> > FileReference -> upload()
> >
> >> Although Flash Player has no restriction on the size of files you can
> upload or download, the player officially supports uploads or downloads of
> up to 100 MB.
> >
> > I experienced that an upload / download of a larger file via Flash
> (FileReference) is possible.
> >
> > I agree with Avinash! I think this is a good place to discuss this topic
> (and not the stack overflow forum). Because this mailing list is the place
> where we can improve the Flex SDK / Flash.
> >
> > Correct me if I am wrong, but an upload of large files (2 GB or more) is
> currently not possible in Flash. And maybe we can check if it is possible
> to enable a larger file upload / download via Flex / Flash. This feature is
> very useful for Enterprise RIA's. I have already developed such an app and
> have the same problem.
> >
> > Thanks!
> >
> > Marcus
> >
> > Am 28.03.2012 um 16:55 schrieb Avinash Narayanan:
> >
> >> Hi JP,
> >>
> >> Thanks for taking time to reply! Stackoverflow had questions like this
> but
> >> not satisfactory answers. This was my last ditch effort since the other
> >> option is to write my own SFTP plug (which clients wont pay me to do
> :|).
> >>
> >> As for the apps, this upload needs to be 'part' of a desktop application
> >> written in adobe air so can't use any of these other tools :(
> >>
> >> Thanks
> >> Avinash Y
> >>
> >>
> >> On Wed, Mar 28, 2012 at 6:54 PM, JP Bader <jp@zavteq.com> wrote:
> >>
> >>> Hi Avinash,
> >>>
> >>> My quick take on this is why you would want to recreate a tool for
> >>> this?  Aren't there plenty of free SFTP apps already?  Why not take
> >>> advantage of one of them? Tortoise, Cute, WinSCP, FileZilla, etc.
> >>>
> >>> Also, questions like these might be better asked on other forums like
> >>> stack overflow.  This mailing list is for questions and development
> >>> regarding the next release of Flex.
> >>>
> >>> Regards,
> >>>
> >>> JP
> >>>
> >>> On Wed, Mar 28, 2012 at 3:16 AM, Avinash Narayanan
> >>> <avinashapr9@gmail.com> wrote:
> >>>> Hi All,
> >>>>
> >>>> I know this community is meant for future development of Apache Flex
> but
> >>>> I'm a little lost here. I need to upload ~2Gb file from my local
> machine
> >>> to
> >>>> a url via an air app using sftp. problem is we don't have sftp lib
> >>>> available.
> >>>>
> >>>> Also, I'm confused as to why in forums it says the flash player needs
> to
> >>>> take the entire file into memory before loading it but I don't see any
> >>>> memory increase in my task manager (using the fileReference class).
> >>>>
> >>>> Another thing I wanted to know is how best to split up the file into
> >>> chunks
> >>>> for multi-part loading? Any help in any of these areas will be
> supremely
> >>>> helpful!
> >>>>
> >>>> I've already seen the following links
> >>>>
> >>>> http://www.actionscript.org/forums/showthread.php3?t=181895
> >>>> http://forums.adobe.com/thread/631103
> >>>> http://blog.ansuz.nl/index.php/2011/02/11/flex-ftp-abort/
> >>>> http://maliboo.pl/projects/FlexFTP/
> >>>> http://forums.adobe.com/thread/245294
> >>>>
> >>>
> http://blog.flexexamples.com/2007/09/21/uploading-files-in-flex-using-the-filereference-class/
> >>>>
> >>>> Thanks in Advance.
> >>>>
> >>>>
> >>>> With Warm Regards,
> >>>> Avinash
> >>>
> >>>
> >>>
> >>> --
> >>> JP Bader
> >>> Principal
> >>> Zavteq, Inc.
> >>> @lordB8r | jp@zavteq.com
> >>> 608.692.2468
> >>>
>
>
>
> --
> JP Bader
> Principal
> Zavteq, Inc.
> @lordB8r | jp@zavteq.com
> 608.692.2468
>

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