Re: [Cppcms-users] (no subject)

[eric m. <mid...@gm...>]

Hi Marcel,

Thank you for your reaction. I have well over 25 years experience with
programming in c, c++,  c# and Ruby, but have virtually no experience with
web-development. I do understand the concepts but am struggling to get a
working comet-example to use.

See my comments underneath at the ### marks.

Hope you can help me out here.

Kind regards,
Eric






On Thu, Feb 20, 2014 at 1:12 PM, Marcel Hellwig <ke...@co...> wrote:

>
>
> On 20.02.2014 05:12, eric middelkoop wrote:
> > Hello,
> >
> > I am looking for a way to update parts of a webpage via events from the
> > server.
> >
> > I downloaded the Ticker example from the blog but as I try to compile it
> > (os = Ubuntu) I'm getting the following errors:
> which version of gcc do you using?
>
###4.7.3



 > g++  -std=c++0x -O2 -Wall -g ticker.cpp -o ticker -lcppcms -lbooster
> > ticker.cpp: In member function 'void
> > ticker::async_send(booster::shared_ptr<cppcms::http::context>)':
> > ticker.cpp:83:39: error: capture of non-variable 'ticker::counter_'
> > ticker.cpp:97:9: note: 'int ticker::counter_' declared here
> fun fact: ticker.cpp has only 76 lines :)
> Which version of the ticker are you using? The latest from svn trunk?
>
###The first one that gives the compiler error I got from here:
http://cppcms.com/files/ticker/
###The other one that does compile but reacts like described underneath I
got from here ###
https://svn.code.sf.net/p/cppcms/code/framework/trunk/contrib/server_side/sse/



 >
> > I also downloaded the Sse Ticker example from contrib and that does
> > compile but when I run it and access the page from firefox
> > (127.0.0.1:8080/ticker <http://127.0.0.1:8080/ticker>), I get a 404 Not
> > Found and a popup with the following information:
> hmm. I think you mess up things. 404 really means nothing, but firefox
> has a file which will be presented to you.
> >
> > -------------------------------------------------------
> > ticker
> > which is: text/event-stream
> > from: http://127.0.0.1:8080
> >
> > What should firefox do with this file?
> > - Open with Browse
> > - Save File
> > --------------------------------------------------------
> >
> > It doesn't display the tickers on the webpage.
> Yep, that's right, but that's what the ticker does. It does not have a
> page to display, but emits events the whole time to a stream. To view
> the content you can use this:
>
> > wget localhost:8080/ticker -qO - | cat
>
###Ok I understand this. But the page does contain the following:
<p>Price:<span id="price"></span></p> so I had expect it to show something.
If that's not doing it, how can I translate that stream into a field that
is updated and displayed on every change?





>
> >
> > I have a camera that is shooting photographs and want a webpage to
> > reflect what the camera is doing. So every time it shoots a photograph
> > the webserver should send the filename and sequencenumber of that
> > photograph to the webpage and the user must be able to inform the camera
> > to stop taking pictures via pressing a button.
> You need a webpage that does some magic javascript and a backend. That
> shouldn't be that hard.
> > So HTTP requests to
> > control the camera and asynchronous status-updates to be displayed on
> > the webpage.
> >
> > I hope someone can help me out by either getting one of the ticker
> > examples working or providing another working example.
>
> As I said. Everything works in the way that it should be. Maybe the chat
> example is more for you :)
> >
> > Many thanks!
> >
> > Eric
> >
> >
> Greetings
> Marcel
>
>
>
>
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-- 
Groetjes,
Eric

http://www.lightandmagicphotography.nl
http://www.lightandmagicphotography.com