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787 - Tk - laying out your GUI with frames, pack and grid
Using Tk (in Tcl or in Perl), you create a number of components that you want to display as part of your GUI (Graphic User Interface) using commands such as button, label and canvas. These components are known as widgets. Once you've created your widgets, you need to use a geometry manager to tell ....

786 - First Light, Bootle Docks, Liverpool
      Taken at around 05:30 this morning, from the "Norland" ferry from Dublin, waiting to disembark. The lovely low dawn light makes for some spectacular shapes and colourations. ....

785 - Running external processes in Tcl and Tcl/Tk
If you want to run external processes from a Tcl based program (Tcl, Tcl/Tk, expect), there are various ways of doing it. Firstly, the whole purpose of the Expect extension is to allow you to control other processes via its three major commands of spawn which starts another process, send which send ....

784 - Which way to turn?
Do concrete mixers turn clockwise or anticlockwise? As I drove back to my hotel last night, I passed a line of three such vehicles, barrels zebra striped and clearly showing they were in action. And two turning one way, and one the other. Perhaps two were mixing, and one was separating the ingred ....

783 - Good follow up ... my thanks
My grateful thanks to our local police inspector for going well beyond the call of duty in explaining some of the law and the Wiltshire police policy in applying it with regard to the incident I reported here the other week. I've added an update quoting many of his words. I appreciate that the poli ....

782 - Converting between Hex and Decimal in Tcl
Tcl is much used in the semiconductor industry, so there's a common requirement to use it to convert values back and forth between hexadecimal (base 16) and decimal (base 10). Easily done! The format command can be used to convert from decimal to hexadecimal, and the expr command can be used to c ....

781 - Tcl - lappend v concat
In Tcl, you can use the lappend command to add items on to a list, but it doesn't always do exactly what you wish it to. Let's say that I've got two lists - the first containing the early courses of a meal, and the second containing the latter courses. If I append the second list to the first, th ....

780 - Separation and Integration
With the smoking ban in enclosed public places here in Ireland now being old news, things have settled down to the new way, and you'll find two communities at pubs like the one that's attached to the Plaza Hotel in Tallaght where I'm staying this week. A deep break as you walk toward the pub from t ....

779 - The fragility of pancakes - and better structures
Have you ever hunted around a directory for a file ... you KNOW it's there, but you can't find it - can't see the wood for the trees, if you like, in a listing that spills over many pages? I call such directory structures "pancakes" as they're thin and flat, and they tend not to be very easy to wor ....

778 - Weekend in Ireland
Greetings from Ireland ... it feels almost like a regular trip, arriving at first light on the boat at Dublin Docks. This weekend's been a little different; rather that head all the way back from Liverpool to home late into Friday evening, just to set off again during Sunday (and perhaps via Liver ....

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