Global variable in LISP & MDI

contact lost
contact lost
in Programming and customization

I have found a serious problem in using of global variables in LISP. It is case of AutoCAD compatibility violation. You can test next sample:1) In current drawing (e.g. drawing1) type :(setq gv “dr1”)(print gv)returned “dr1” . It is OK2) Create new drawing (e.g. drawin2). You can test varible “gv” by typing(print gv)returned nil. It is OK, because LISP works in separated namespaces, isn’t it.3) Now you can set “gv” in this drawing(setq gv “dr2”) (print gv)returned „dr2“It is OK still.4) Make current drawing1 and test(print gv)returned “dr2” !!!It is bug, isn’t it?Does somebody know how to solve this problem?

Comments

  • contact lost
    contact lost

    Until they fix the bug, I suggest that you have to set to nil any variable you use in a Lisp routine.

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