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Reading from a URL, and reading Json, from your Tcl script

You can read from a URL in Tcl using the http package ... for example

  package require http
  set handle [::http::geturl http://www.wellho.co.uk/robots.txt]


And you can then collect the data:
  set body [::http::data $handle]

and the http status code:
  set stat [::http::ncode $handle]

and the headers:
  set headers [::http::meta $handle]

See [here] for the complete source code and sample output. The http::configure command gives a wide variety of configuration options too.

A further example - [here] - picks up json data via http, and converts it into a Tcl structure which it then displays. Of course, once you have the data, you can do just about anything with it.
(written 2015-03-12, updated 2015-03-15)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T241 - Tcl/Tk - Tcl on the Web
  [2429] Tcl scripts / processes on a web server via CGI - (2009-09-27)
  [2238] Handling nasty characters - Perl, PHP, Python, Tcl, Lua - (2009-06-14)
  [2040] Error: Cant read xxxxx: no such variable (in Tcl Tk) - (2009-02-14)
  [1785] What is running on your network? (tcl and expect) - (2008-09-04)

T209 - Tcl/Tk - File and Directory Handling
  [4524] Tcl - a new example for data reformatting - (2015-10-10)
  [4523] Catching failed commands and not crashing the program in Tcl - (2015-10-10)
  [3617] The fileutil package and a list of file system commands in Tcl - (2012-02-18)
  [3429] Searching through all the files in or below a directory - Ruby, Tcl, Perl - (2011-09-09)
  [3320] Reading the nth line from a file (Perl and Tcl examples) - (2011-06-09)
  [3192] Tcl - Some example of HOW TO in handling data files and formats - (2011-03-04)
  [2467] Tcl - catching an error before your program crashes - (2009-10-22)
  [1467] stdout v stderr (Tcl, Perl, Shell) - (2007-12-10)
  [1426] Buffering up in Tcl - the empty coke can comparison - (2007-11-10)
  [1407] Reading from another process in Tcl (pipes and sockets) - (2007-10-26)
  [785] Running external processes in Tcl and Tcl/Tk - (2006-06-29)
  [779] The fragility of pancakes - and better structures - (2006-06-26)


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Server program written in Tcl using sockets
Reading from a URL, and reading Json, from your Tcl script
Using Object Oriented Tcl and the Tk toolkit together - real life example
Managing the window size (and layout) in Tcl/Tk
A new Tcl/tk example - a window to show system status
Test framework for TCL - Tcltest - some examples
Objects in Tcl - iTcl - updated first steps example
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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