Re: [Cppcms-users] (no subject)

[Marcel H. <ke...@co...>]

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?
> 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?
> 
> 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


> 
> 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