cyberbrain wrote:

> How can I redirect the modified stream to a window which
> ables the user to choose a file name and emplacement ?

You mean that the user is uploading a file, then the server
modifies it, and sends it directly back to the user, so that
the browser should display the "save as" dialog?

Then your server-side program should send these HTTP response
headers, e.g.:

  Content-Disposition: attachment;filename="somefile.zip"
  Content-Type: application/octet-stream

http://en.wikipedia.org/wiki/List_of_HTTP_header_fields

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17


Have fun,
Berny

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