Can't write local files in Flash Player 10+ online (but works when used locally)

Question

I am trying to write a local file with Flash Player 10+ using the FileReference class, following the format from this blog post by Mike Chambers: http://www.mikechambers.com/blog/2008/08/20/reading-and-writing-local-files-in-flash-player-10/

Essentially the code is this:

private function onSaveButtonClick(event:MouseEvent):void{      
    fr = new FileReference();
    fr.save(fileToSave);}

It works fine locally on my machine but when used online, it doesn't bring up the save file dialogue when the save button is clicked. I assume this is some sort of permissions or security related issue?

Do you have an example running on a server? There's nothing that I know of that restricts FileReference.save when executing from a server, so a running example would be helpful. — JimmiTh, Feb 07 '12 at 19:12
It works when I run it on a localhost server but not on my online server — Steven, Feb 08 '12 at 06:40
What is `fileToSave`? Do `onFileSave`, `onCancel` or `onSaveError` trace anything — Eugeny89, Feb 09 '12 at 13:03
@Eugeny89 I debugged it more and it looks like its actually a crossdomain flash security issue related to getting an image from S3 to create a bitmap out of. I've created a new question at http://stackoverflow.com/questions/9217973/flash-flex-crossdomain-issue-using-bitmapdata-draw-for-image-from-aws-s3-res — Steven, Feb 09 '12 at 20:11

score 1 · Answer 1 · answered Dec 26 '12 at 19:43

1

You should check your log for SecurityErrors. A sandbox violation is nearly always the cause when IO works locally but not online.

answered Dec 26 '12 at 19:43

Peter Hall

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score 0 · Answer 2 · answered Mar 02 '12 at 16:12

Your instance of FileReference might be garbage collected. Same happens with file upload.

Try to move it to instance variable:

private var fr = new FileReference();
private function onSaveButtonClick(event:MouseEvent):void{      

    fr.save(fileToSave);
}

Can't write local files in Flash Player 10+ online (but works when used locally)

2 Answers2