How about running an portable Apache/PHP stack off the the usb stick
along with portable firefox. The Apache server with php can write
your XML file. I have been trying out one of the portable
firefox/thunderbird/etc usb installs and it works quite well. I don't
see why you couldn't setup apache and php to run off the usb stick and
basicly use it for your backend. Doing it that way should make it so you
don't need to write anything using the browser just post it back to the
web server and have it do it.
Larry Offley
www.offley.ca
Robert Wesley McGrew wrote:
On 4/25/07, Jim Clark <diegoslice@gmail.com> wrote:
I've been asked to help solve a browser issue that is thorny at best if
not impossible due to security.
There is a browser based application written in Flash Action Script that
needs to write an XML file to the local disk. Picture a salesman with a
USB flash drive that he can use at a customer's site. All the files are
on the flash drive and a remote server is never contacted so the
application is completely client side. To start the application, a
browser is fired up and the local file opened from the flash drive which
is a form with several list boxes that the customer can choose various
options and then submit the form. What should happen is a XML file is
then written to disk which the application uses in several ways further
downstream including applying an XSLT transformation to display the
results.
The specification targets IE6, IE7 and Firefox running on XP and Vista.
The catch is that none of these browsers allows files to be written to
disk for security reasons regardless if Java applets, JavaScript,
ECMAScript, etc. are used. So the problem is once the form is submitted
and the Flash Action Script has the output XML ready, how to circumvent
security and get the XML file written to preferably the same drive and
directory the application was launched from.
Having never programmed in Flash Action Script, I was hoping that Action
Script could call an executable and pass either the XML or form
parameters to create the XML. The initial feedback to this was "big
doubts" to paraphrase nicely.
Is what I described possible? Are there other solutions for
accomplishing this? The application is nearing completion and this piece
is becoming trickier than expected.
Thanks in advance!
-Jim
I would say that this is a design problem of trying to shoehorn
technologies meant for web applications into a problem that never
called for them. I think you are getting closer to your solution when
you mentioned calling an executable, in that this is a situation that
calls for a standalone application to do everything you've described.
Is there any compelling reason why it's written in Flash Action Script
to run in a web browser, if there's no communication being made?
