[ELECTRON] PHP - question. . . webcam script...again(ish)

Wed Apr 21 08:42:23 UTC 2010

Thanks Roy, Im totally flummoxed on this one. . .
Ben

On 21 April 2010 01:39, Roy Mohan Shearer <fy81le at googlemail.com> wrote:

> Looks fine to me, running Firefox in XP from home. Also fine in Opera.
>
> Roy Mohan Shearer
> (post-)Industrial Designer
>
> ____________________________________________________
> Zero-waste Design,
> Southside Studios, 17 Westmoreland St., Glasgow, G42 8LL
> +44 (0)7974896651
> www.zero-waste.co.uk
> ___________________________________________________
> www.tinyurl.com/thesoundishere | www.dbasscollective.co.uk
>
>
>
>
> On 20 April 2010 22:28, Ben Rush <orionrush at gmail.com> wrote:
> > Hey folks,
> > Just an update on the project that I was working on.
> > www.astonesthrowaway.co.uk is live, check it out. The beacon is having
> some
> > servicing at the moment so isn't active but the question I need help on
> is
> > in the PHP webcam script that I was working on a month ago.
> > the updated code can be found here: http://pastebin.com/xsd9tKU6
> > To my alarm I was looking at the site from a web kiosk at the BBC and the
> > home page was throwing a 404. Now I realise this might be a simple case
> of
> > the site not being on their allowed list, but oddly I could still get
> still
> > to the backend and preview the site through an Iframe just fine from the
> > same computer. Could my script be causing this
> error? The script generates
> > the image for the background of the page so I directed the browser to the
> > script itself and the browser balked, citing an illegal execution - I
> assume
> > this to be the echo on line 38, which dumps the jpg data to the browser
> > (with appropriate headers).
> > Will a few folks running windows take a look at this for me? I've
> previewed
> > this in IE6,7,8 in an emulator and didn't run into this behaviour. Whats
> > alarming is that the site is totally inaccessible to anyone working under
> > these restrictions - very bad news.
> > Anybody have any bright ideas?
> > Many thanks,
> > Ben Rush
> >
> >
> >
> > On 4 April 2010 14:41, Ben Rush <orionrush at gmail.com> wrote:
> >>
> >> Holly cow - IT LIVES!
> >> I had no idea - I just thought I'd keep the error reporting to see what
> >> went wrong. Didn't clock that it this in itself would generate headers,
> but
> >> it makes total sense. Thanks so much Mark & Gordon for looking at this -
> >> beer's on me when we meet.
> >> Cheers all for the air-time, - Merry Easter!
> >> Ben R.
> >> On 4 April 2010 00:45, Mark Bryars <electronclub at darkskiez.co.uk>
> wrote:
> >>>
> >>> You probably don't have errors suppressed, and the fopen to test if the
> >>> camera is there is failing and printing an error, which generates
> >>> output, which means you cant send any headers.
> >>>
> >>> prefix the fopen with an @ sign
> >>>
> >>> if (@fopen($img_remote, "r")== true )
> >>>
> >>>
> >>> Regards,
> >>>  Mark
> >>>
> >>> Ben Rush wrote:
> >>> > Gordon,
> >>> >
> >>> > Thanks for taking a look at this - I got the sense that an something
> >>> > was firing off before it should. I've yet to break away from family
> >>> > obligations this weekend, but I have managed to post the code to
> paste
> >>> > bin: http://pastebin.com/rrC86Zdj
> >>> >
> >>> > happy Easter everyone - cracking day out today, spent it fishing for
> >>> > sculpture bits out of the graving docs in Govan -- good times!
> >>> >
> >>> > Ben
> >>> >
> >>> >
> >>> > On 3 April 2010 20:43, Gordon JC Pearce <gordonjcp at gjcp.net> wrote:
> >>> >
> >>> >> On Sat, 2010-04-03 at 00:15 +0100, Ben Rush wrote:
> >>> >>
> >>> >>> Hello folks,
> >>> >>> Im going to preface this by stating I'm a self described noob, so
> if
> >>> >>> this seems elementary - I stand by my assertion.
> >>> >>> I have come to a block and Im not sure how to deal with it, and any
> >>> >>> thought would be amazing.
> >>> >>>
> >>> >>> Im working on a fetch image script for a webcam and everything
> seemed
> >>> >>> hunky-dorry.
> >>> >>>
> >>> >>> I later decided to add an if/else on the off chance the camera
> wasn't
> >>> >>> available. This is where things got confusing.
> >>> >>>
> >>> >>> If the camera fails I get a "Warning: Cannot modify header
> >>> >>> information". The thing is I cant figure out were the header info
> is
> >>> >>> being declared, as the warning seem to indicate that the
> declaration
> >>> >>> comes from in the 'if' statement itself. Wait didn't that just
> >>> >>> fail?!?
> >>> >>>
> >>> >> Something is outputting stuff to the server before you get a chance
> to
> >>> >> send the header() part.
> >>> >>
> >>> >> A quick demonstration - type "telnet www.electronclub.org 80"
> >>> >> Once you get the "Escape character is '^]'." message type
> >>> >> "GET / HTTP/1.0" then <RETURN> <RETURN>
> >>> >>
> >>> >> You'll see the server's response - "HTTP/1.1 200 OK" and a bunch of
> >>> >> things like "Date:" and "Length:" and importantly "Content-Type:".
> >>> >> These are the headers.  There's a blank line before the actual
> content
> >>> >> *and this is very important*.
> >>> >> Once you send that blank line, you cannot send any more headers.
> >>> >>
> >>> >>
> >>> >>> Moving the 'header('content-type: image/jpg');' higher up in the
> >>> >>> script doesn't seem to fix it. Moving it before the if statement
> all
> >>> >>> together gives a broken image link - the echo of file contents
> don't
> >>> >>> seem to make to the browser.
> >>> >>>
> >>> >>> I also checked to see if there was any empty space before or after
> my
> >>> >>> <? ?> - no empty echoes there either. .
> >>> >>>
> >>> >> Can you put the script up in something like pastebin, with line
> >>> >> numbers?
> >>> >> That would make it a wee bit easier to trace.
> >>> >>
> >>> >> Gordon MM0YEQ
> >>> >>
> >>> >>
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> > --
> > orionrush at gmail.com
> > M +44 7964 565 153
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-- 
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M +44 7964 565 153
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