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Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

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AgtInvoke - a command to drive Agilent Tcl software extensions

In Tcl, there's a lot of commands available already - and there would be a lot more if separate commands were provided for each operation you might wish to perform. So some of the commands that are provided are really megacommands that wrap a whole lot of others up in a single group.

Let's take string handling as an example. There are scan and format and append commands available, and there's what I'll call a megacommand called string which takes a second parameter calling up a particular subcommand - something like string match or string length or string trim. Other megacommands include info and file and clock.

Tcl is a library to be built with other proprietory code, and sometimes that other code can be included as additional Tcl commands. I'm running a Tcl course this week, for a customer who's using a Tcl that's been built by Agilent for use with some of their equipment ... and the sample code Dave has with him includes lots of calls to AgtInvoke.

Now I've never come across AgtInvoke before, but looking at the syntax of the code, it's very clearly a sommand with at least one level of subcommand - and this drives the whole Agilent-specific end of the code. It's a very neat way of doing things. Of course, I'm not able - as a generalist - to be able so say exactly what each AgtInvoke does - but I can (and have) guided my customer through the details of the Syntax calls to at, and shown him how - very neatly - the Agilent folks have extended Tcl by adding just the one extra command.
(written 2007-07-26, updated 2007-07-25)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T214 - Tcl/Tk - Other Facilities in Tcl
  [239] What and why for the epoch - (2005-03-08)
  [364] pu daily and p hourly - (2005-06-30)
  [366] Error handling in Tcl through catch - (2005-07-02)
  [461] Shortened interactive commands - (2005-10-11)
  [748] Getting rid of variables after you have finished with them - (2006-06-06)
  [782] Converting between Hex and Decimal in Tcl - (2006-06-28)
  [1334] Stable sorting - Tcl, Perl and others - (2007-09-06)
  [1338] Handling Binary data in Tcl (with a note on C) - (2007-09-09)
  [2467] Tcl - catching an error before your program crashes - (2009-10-22)
  [3287] Exceptions - Tcl style - (2011-05-12)
  [3570] Trapping errors in Tcl - the safety net that catch provides - (2012-01-06)
  [3583] Expanding a list of parameters in Tcl - {*} and eval - (2012-01-17)
  [4207] Exception handling in Tcl - (2013-11-14)
  [4523] Catching failed commands and not crashing the program in Tcl - (2015-10-10)
  [4525] What does Tcl do if you try to run a command that is not defined? - (2015-10-10)
  [4762] Coverage map in Tcl - how many times has each proc been called? - (2017-09-28)


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