Hello
I have been playing with tcl/tk in R 2.4.0 on windows XP and have
managed to crash R by supplying tcl/tk with an incorrect color.
Is this a bug? is there a way for me to test the color to see if it is a
valid tcl/tk color, to avoid this?
tt=tktoplevel()
tklabel(parent=tt, text="hello world", foreground="reed")
Error in structure(.External("dotTclObjv", objv, PACKAGE =
"tcltk"),
class = "tclObj") :
[tcl] unknown color name "reed".
An error is displayed as one would expect, however when I try
tktext(parent=tt, foreground="blaaack")
R crashes, rather than displaying an error as tklabel did.
This, however, does not happen on my FreeBSD machine, which displays an
error similar to the one for tklabel and does not crash.
Thanks for any help,
Alex Couture-Beil
On 10/16/2006 10:47 PM, Alex Couture-Beil wrote:> Hello > > I have been playing with tcl/tk in R 2.4.0 on windows XP and have > managed to crash R by supplying tcl/tk with an incorrect color. > Is this a bug? is there a way for me to test the color to see if it is a > valid tcl/tk color, to avoid this? > > tt=tktoplevel() > tklabel(parent=tt, text="hello world", foreground="reed") > Error in structure(.External("dotTclObjv", objv, PACKAGE = "tcltk"), > class = "tclObj") : > [tcl] unknown color name "reed". > An error is displayed as one would expect, however when I try > tktext(parent=tt, foreground="blaaack") > R crashes, rather than displaying an error as tklabel did. > > This, however, does not happen on my FreeBSD machine, which displays an > error similar to the one for tklabel and does not crash.I see the same crash in Windows, occurring deep in one of the TCL routines, where it tries to work with a font, but the font has not been assigned. TK on Windows uses a different display driver than FreeBSD does, so this could be a TK bug, rather than an R bug, and it does look like that. Alternatively, we might be ignoring an error generated in TK, in which case it is our bug: but the tklabel example makes that sound wrong. To verify, it would be nice to try the same commands in wish (or some other TCL/TK platform). Do you know the pure TCL equivalent? Duncan Murdoch
On 10/16/2006 10:47 PM, Alex Couture-Beil wrote:> Hello > > I have been playing with tcl/tk in R 2.4.0 on windows XP and have > managed to crash R by supplying tcl/tk with an incorrect color. > Is this a bug? is there a way for me to test the color to see if it is a > valid tcl/tk color, to avoid this? > > tt=tktoplevel() > tklabel(parent=tt, text="hello world", foreground="reed") > Error in structure(.External("dotTclObjv", objv, PACKAGE = "tcltk"), > class = "tclObj") : > [tcl] unknown color name "reed". > An error is displayed as one would expect, however when I try > tktext(parent=tt, foreground="blaaack") > R crashes, rather than displaying an error as tklabel did. > > This, however, does not happen on my FreeBSD machine, which displays an > error similar to the one for tklabel and does not crash.A little bit more information: I traced through the TK code, and it does recognize the error and tries to deal with it, but in the process of destroying the partially created text widget, it dies. I think this is a TK bug rather than an R bug; I don't know a good workaround. Duncan Murdoch> Thanks for any help, > Alex Couture-Beil > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.