[R] tcltk crashes with bad color with text widget

[Peter Dalgaard]

Duncan Murdoch <murdoch at stats.uwo.ca> writes:

> 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?

Should be close to this

toplevel .1
label .1.1 -text "hello world" -foreground reed
text .1.2 -foreground blaack

(and it doesn't crash on my machine, in R or wish)

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