From: knerr@... (Jeff Knerr)
Date: 2006-05-03T06:01:43+09:00
Subject: new to ruby & tk -- seg fault with many buttons

 I'm trying to teach myself ruby/tk, and am getting a seg fault with the
 program below (part of a hangman game). Actually, it only seg faults
 some of the time (if you hit Quit right away, or just one letter, then Quit).

 I'm seeing the seg fault on a Debian 3.1 machine: 

$ ./bb
You just hit the i button.
/usr/lib/ruby/1.8/tk.rb:1194: [BUG] Segmentation fault
ruby 1.8.2 (2005-04-11) [i386-linux]

Aborted

 I tried it on a Mac, and it did not seg fault (ruby 1.8.1 (2003-12-25) [powerpc-darwin]).
 Also, odd things seem to make it work ok (removing the -w, putting
 everything in the top frame, removing a few letter buttons).

 I've searched the list and FAQ and google a bit, but didn't see
 anything obvious. Let me know if I'm just doing something stupid.
 And thanks for any help.

jeff

#! /usr/bin/ruby -w

require 'tk'

def guess(ch)
  print "You just hit the #{ch} button.\n"
end

root = TkRoot.new { title "buggy buttons" }
top = TkFrame.new(root)
bottom = TkFrame.new(root)

quit=TkButton.new(top) { text ' Quit '; command {exit}; pack }

g=TkButton.new(top) {text 'g'; command {guess('g')}; pack }
h=TkButton.new(top) {text 'h'; command {guess('h')}; pack }
i=TkButton.new(top) {text 'i'; command {guess('i')}; pack }
j=TkButton.new(top) {text 'j'; command {guess('j')}; pack }
k=TkButton.new(top) {text 'k'; command {guess('k')}; pack }
l=TkButton.new(top) {text 'l'; command {guess('l')}; pack }
m=TkButton.new(top) {text 'm'; command {guess('m')}; pack }
n=TkButton.new(bottom) {text 'n'; command {guess('n')}; pack }
o=TkButton.new(bottom) {text 'o'; command {guess('o')}; pack }
p=TkButton.new(bottom) {text 'p'; command {guess('p')}; pack }
q=TkButton.new(bottom) {text 'q'; command {guess('q')}; pack }
r=TkButton.new(bottom) {text 'r'; command {guess('r')}; pack }
s=TkButton.new(bottom) {text 's'; command {guess('s')}; pack }
t=TkButton.new(bottom) {text 't'; command {guess('t')}; pack }
u=TkButton.new(bottom) {text 'u'; command {guess('u')}; pack }
v=TkButton.new(bottom) {text 'v'; command {guess('v')}; pack }
w=TkButton.new(bottom) {text 'w'; command {guess('w')}; pack }
x=TkButton.new(bottom) {text 'x'; command {guess('x')}; pack }
y=TkButton.new(bottom) {text 'y'; command {guess('y')}; pack }
z=TkButton.new(bottom) {text 'z'; command {guess('z')}; pack }

top.pack
bottom.pack
Tk.mainloop