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4463 - Rail Conference, Nottingham
I think this is the first week that I'm NOT training this year (!) ... so I'm at a rail conference organised by the Association of Community Rail Partnerships today and tomorrow, in Nottingham. A wonderful opportunity to network, to meet and talk with a wide range of our rail partners and also (d ....

4462 - Server program written in Tcl using sockets
Tcl includes socket libraries so that you can write your own clients and servers. Our recommendation is that you stick with standard protocols and use packages such as http rather than inventing your own - however, there might be occasions and on that basis we've got examples on our Tcl Programming ....

4461 - 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:   se ....

4460 - Using Object Oriented Tcl and the Tk toolkit together - real life example
There are all sorts of ways to look at the survey data we gathered last October on the TransWilts trains, and one fact I'm particularly interested in is the journey lengths of passengers. I have all the information to hand that I need to work this out - but in different files: Survey data [h ....

4459 - Managing the window size (and layout) in Tcl/Tk
Complex window layouts are comprised in a series of simple window layouts nested within each other - as an example I wrote today on our Tcl/Tk course. You can see a capture of this display in with this article. The buttons on the left are in a frame of their own, and the graphic area ("Canvas") acr ....

4458 - A new Tcl/tk example - a window to show system status
From today's Tcl course - where we have also added a GUI on the front using Tk to give a window in which we display system information. The code is divided into a number of sections 1. Definition of pieces of code to be run in the event of a button being pushed, or some other action 2. Creation ....

4457 - Test framework for TCL - Tcltest - some examples
Tcl ships with the tcltest test suite / harness - and standard advice for coding is to write lots of tests and check with them every time you run your code. There's a (new) first example [here] - loading in Tcltest and defining 3 tests:   package require tcltest       ....

4456 - Objects in Tcl - iTcl - updated first steps example
iTcl is Tcl's Object Oriented package, and it's shipped as standard with Tcl these days. On many of our OO courses, we start off with an example of "train" objects and define and run methods such as "getCapacity" on them, and today I've taken that same example and coded it in Tcl - see [here]. My ....

4455 - Working out distance between places, using OS grid references and a program in Tcl
In Great Britain, locations have Ordnance Survey grid reference positions which place them to within 100 metres. Our training centre / hotel is at ST907633 - that's   100 km square ST   90.7 km into that square from the west side   63.3 km into that squate from the so ....

4454 - Everything is a string - even a list
Almost all variables in Tcl are held as strings ... if you use integers and stirings in calculations such as expr and incr. the strings are converted back and forth intergally. Lists, too, are held as strings of characters in which chunks of string are counted / taken out as being elements in the l ....

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