On 2/5/06, Kenny Tilton ktilton@nyc.rr.com wrote:
This is one of my favorites ever:
To do dataflow from Tk, I settled on:
Translating for Peter, this means Kenny is trying to make changes to the Tk widgets (eg, a text box) show up as changes to c-input slots on the Lisp side. That way c-formulas can react to what the user typed.
trace add variable .w42 write "mytraceproc"And mytraceproc cloned from sendata et al.
After a fascinating learning period I got it to work. Most of the time.
When it fails (get this) it is because the sympol is in a different package (My "LTk2" package.) That is the listener package while I am running. Normally callback gets symbols in LTk, and that is how they are stored in the callback hash table.
The internal interface to callbacks is: create-name, add-callback, remove-callback, and callback. Contrary to what the lambda-list of what the last three would make you believe, callbacks are named by strings, not symbols. You should get the name for a new callback from create-name. I'll be fixing that in subversion if Peter doesn't beat me to it.