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Logic Machine Communication - HTTP - Printable Version

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+--- Thread: Logic Machine Communication - HTTP (/showthread.php?tid=712)

Logic Machine Communication - HTTP - Rodriguez - 31.03.2017

Hello, I would like to know, how can I take information from an HTTP page from the logic machine? Big Grin

RE: Logic Machine Communication - HTTP - admin - 31.03.2017

http://w3.impa.br/~diego/software/luasocket/http.html#request

RE: Logic Machine Communication - HTTP - Erwin van der Zwart - 31.03.2017

Hi,

If you just need a simple datafield you can also use:

Code:
require('socket.http')
socket.http.TIMEOUT = 5

-- Get data from website
local data = socket.http.request('http://openrb.com')

-- Check if data is received
if not data then
    log('No data found')
    return
end

-- Find your data
for i in string.gmatch(data, '<body>.-</body>') do
    if i ~= nil then
        searched_data = i:match([[<h2>(.-)</h2>]])
        if i ~= nil then
            log(searched_data)
        end
    end
end
BR,

Erwin

RE: Logic Machine Communication - HTTP - Rodriguez - 31.03.2017

Hi, Erwin van der Zwar:
Thanks for your help. Yes, it is a simple data capture, use your code but it is not registering anything to me.

RE: Logic Machine Communication - HTTP - Erwin van der Zwart - 31.03.2017

Hi,

The data is now fetched between <h2> </h2> fields but i don't know the fields in your html mark-up so you have to check that and change it to those..

log(data) to see your complete reply from your url source.. or right click your source in the browser and select 'view source code' to see the structure of the site you read..

BR,

Erwin

RE: Logic Machine Communication - HTTP - admin - 01.04.2017

Check is gateway and DNS are set in network config.

RE: Logic Machine Communication - HTTP - Erwin van der Zwart - 01.04.2017

Hi,

I adjusted the sample to a (tested) version to fetch all the main topics from this forum

Code:
require('socket.http')
socket.http.TIMEOUT = 5

-- Get data from website
local data = socket.http.request('http://forum.logicmachine.net')

-- Check if data is received
if not data then
  log('No data found')
  return
end

-- Find your data
for i in string.gmatch(data, '<body>.-</body>') do
  if i ~= nil then
     for j in string.gmatch(i, '<a href="forumdisplay.-</a>') do
        if j ~= nil then
           searched_data = j:match([[">(.-)</a>]])
           if searched_data ~= nil then
              log(searched_data)
           end
        end
     end
  end
end

BR,

Erwin

RE: Logic Machine Communication - HTTP - Rodriguez - 04.04.2017

It works, thanks for your help. Big Grin