[R] tcltk crashes with bad color with text widget

[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
> 
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