Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Wed, 11 Feb 2015 14:28:39 +0100

On 09.02.2015 21:58, Kasemir, Kay wrote:

and then you need to be prepared to parse a response that looks like

HTTP/1.1 200 OK
Content-Type: text/html
Server: Whatever
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 97

.. the actual data..

Try regular expressions to fund the actual data in all the http noise.

See my example in the StreamDevice documentation:

http://epics.web.psi.ch/software/streamdevice/doc/tipsandtricks.html#web

get_title {
  extrainput = ignore;
  replyTimeout = 1000;
  out "GET http://\$1\n\n";;
  in "%+.1/(?im)<title>(.*)<\/title>/";
}

Here \$1 was the web address (e.g. "10.95.101.75/data" in your case).

out "GET http:..."

This is the short worm of what curl does. (You have sent the string

"curl ..." instead of calling curl.)

in "%+.1/(?im)<title>(.*)<\/title>/";

This means: find the tag <title> (ignoring case) and give me the string

beween <title> and </title>.

In case you data is not a string but for example a number you want to

parse into a ai record, use a regular expressions to find the text right

before the data and then parse with %f or another numeric format:

  in "%*/Interesting value:/%f more text";

This first searches for the text "Interesting value:" in the web page

and then parses the value with %f. After the value, it expects the

string " more text".

Dirk

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System