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

Wed Apr 21 00:39:44 UTC 2010

Looks fine to me, running Firefox in XP from home. Also fine in Opera.

Roy Mohan Shearer
(post-)Industrial Designer

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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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>
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