Re: Memory limit of 8 MB not enough

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On 4/16/08, tedd <tedd.sperling@xxxxxxxxx> wrote:
>
> At 10:53 AM -0400 4/16/08, Andrew Ballard wrote:
>
> > On Wed, Apr 16, 2008 at 9:59 AM, tedd <tedd.sperling@xxxxxxxxx> wrote:
> >
> >  >  I saw one the other day that caught my eye -- will look into it.
> >
> > >
> > > The first problem I see implementing the approach is the JavaScript
> > sandbox. JavaScript is allowed to read the text of the input file
> > field (and thus know the file name and path once a file has been
> > selected); it cannot access the disk to actually get to the image or
> > do anything with it. From here, I'm thinking there are a couple things
> > you could do with JavaScript. The first would be to embed the image
> > into the web page using an IMG tag, which would allow you to determine
> > the pixel dimensions (but not the actual file size). The second would
> > be what Gmail seems to do, and actually upload the form to their
> > server with some sort of AJAX request, at which time your server could
> > return information on the size of the file. However, if the file is
> > too large, you're back to the original problem of needing to increase
> > the RAM limit in PHP.
> >
> > The second problem is, as I said, I'm not aware of any JavaScript that
> > can manipulate the image. JavaScript can cause the display of an image
> > to be resized within the browser, but that doesn't actually affect the
> > stored file. I don't know, but I guess if you could actually get to
> > the bits, you could probably write an algorithm in JavaScript to
> > resize an image by manipulating the bits, but I think it would be
> > dreadfully slow if it would even run without running out of resources.
> >
> > I think the only pure-client options are either Java (which would
> > require special permissions to get out of its own sandbox) or ActiveX.
> >
> > If you know of some other approach, I'd be interested to see how it
> > works.
> >
> > Andrew
> >
>
>
> Andrew:
>
> I think you are right -- I wasn't able to resize the image. Here's the
> link that caught my eye, but it doesn't work as described:
>
> http://javascript.internet.com/forms/image-upload-preview.html
>
> Cheers,
>
> tedd
> --
>


It worked for me using IE on XP.

David

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