Python/Tkinter crash.

[James Stroud]

Hendrik van Rooyen wrote:
> Hi,
> 
> I get the following:
> 
> hvr at LINUXBOXMicrocorp:~/Controller/lib> python display.py
> UpdateStringProc should not be invoked for type font
> Aborted
> 
> and I am back at the bash prompt - this is most frustrating, as there is no
> friendly traceback to help me guess where its coming from.
> 
> And what is worse, the script runs for a varying time before it simply exits
> like this.
> 
> What can I do to dig deeper to try to find a clue? - I don't even know if its
> Python, Tkinter or Linux...
> 
> Some background:
> 
> The application is a prototype gui for a controller of an injection moulding
> machine.
> It has two rows of five buttons across the top, and a canvas containing various
> objects over the rest of the screen.
> Extensive use is made of configure to change the text of the buttons, as well as
> their command bindings,
> to keep "the state of the system" current - its quite a hack at this time, as I
> am still experimenting with getting the interface intuitive.
> On the canvas, there are multiple instances of a Meter class to show things like
> temperatures and pressures,
> as well as a schematic representation of the machine, created out of polygons
> and lines.
> The schematic, as well as the Meters, are crudely animated by deleting and
> redrawing the objects repetitively with slightly different parameters in
> response to button presses. This is done by starting different threads to
> implement the various motions, which repetitively call kill and draw methods in
> the main app, after which they (the threads) commit seppoku by returning.
> 
> Everything seems to work fine. - there is a thread that runs to move the meter
> values around continuously, and this has been stable for some time now, and I
> can get the various "machine" parts to move around the screen by pushing the
> buttons.
> The trouble occurs when I put the "machine" into Auto mode, simulating the
> various motions in a loop, - it runs for anything from a few tens to a few
> hundreds of cycles before handing in its dinner pail like this.
> 
> Any Ideas on what to do next to find the culprit?
> 
> - Hendrik
> 

Minimal source code to reproduce this error would help tremendously.