I don’t know much about win32ole extension, but LocalJumpError has
nothing to do with the extension, but more with how “return” operation
works in Ruby. For example,
$ ruby -v
ruby 1.9.0 (2004-03-10) [powerpc-darwin]
$ irb
irb(main):001:0> (1…10).each{return}
LocalJumpError: return from proc-closure
from (irb):1
from (irb):1:in `each’
from (irb):1
Kent, thanks. This helps me see that the behavior i’m seeing is not a
consequence of win32ole.
The thing is that in this case the context of the ‘return’ has passed
already.
For details check out this discussion:
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/2583
I’m sorry, but i’m too dumb to understand this. Instead, i made some
experiments, which i repeat below.
I’m seeing the following in 1.8.0 (mswin32) using win32ole:
irb(main):009:0> for form in $iec.document.forms
irb(main):010:1> if form.action == “start”
irb(main):011:2> return form
irb(main):012:2> end
irb(main):013:1> end
LocalJumpError: unexpected return
from (irb):11
from (irb):9:in `each’
from (irb):9
Bret,
There are probably better ways to do this that I would think of if I
weren’t so tired, but this one will get you around the JumpError problem.
form = callcc do |cc|
ie.document.forms.each do |form|
if(form.action == “start”)
cc.call(form)
end
end
end
puts form.inspect
“#<WIN32OLE:0x28bcf48”
Chad
Thanks Chad. I actually included my workaround in my original post (but
which kent snipped). I don’t understand what you have here. Here’s my
original workaround:
def get_form_by_action(action)
“Return the first Form on the current page that has the specified Action.”
retval = nil # this ugliness avoids scripts hanging on exit (1.6) or a
LocalJumpError (1.8)
for form in @iec.document.forms
next if retval
if form.action == action
retval = IEDomFormWrapper.new(form)
end
end
return retval
end
Here is what i really want to do:
irb(main):036:0> $iec.document.forms.find {|f| f.action == “start” }
WIN32OLERuntimeError: Unknown property or method : find' HRESULT error code:0x80020006 Unknown name from (irb):36:in method_missing’
from (irb):36
from ?:0
forms is an OLE collection object, so it supports each, but apparently
doesn’t have Enumerable mixed in. Can i mix this in on my own? Should i be
expecting this to be done by the WIN32OLE library?
Here’s my latest rewrite, which works, and is easier for me to understand
and explain than the one you gave Chad. (I don’t know what callcc does.
Continuations? I’ll leave that for another day.)
def get_form_by_action(action)
“Return the first Form on the current page that has the specified Action.”
for form in @iec.document.forms
break if form.action == action
end
IEDomFormWrapper.new(form)
end
I did try the following, but was surprised to see that it didn’t work,
since i thought that this was supposed to be the same as the previous but
more the ruby way.
def get_form_by_action(action)
“Return the first Form on the current page that has the specified Action.”
@iec.document.forms.each do | form |
break if form.action == action
end
IEDomFormWrapper.new(form)
end
This give this error:
irb(main):044:0> get_form_by_action(“start”)
NameError: undefined local variable or method form' for #<Object:0x100f9480> from ./toolkit/iec-assist.rb:39:in get_form_by_action’
from (irb):44
from ./toolkit/iec-assist.rb:2
To correct, i need to explicitly change the scope of the bound variable:
def get_form_by_action(action)
“Return the first Form on the current page that has the specified Action.”
form = nil
@iec.document.forms.each do | form |
break if form.action == action
end
IEDomFormWrapper.new(form)
end
As you may know i am preparing to teach novices to use Ruby, and i can’t
quite think of how i can teach them why these two forms are different. It
would be much easier for me to be able to say they are the same. (Between
you and me, i see that the scope of the bound variable is different between
the for-in and each forms. But this means that the difference is more than
just syntactic sugar.)
So, am i still confused somewhere? Is it supposed to be this way? (I’m
using 1.8.0.)
Is there a way i can get forms.find to work directly?
Bret
···
At 10:12 PM 3/11/2004, Chad Fowler wrote:
On Thursday, March 11, 2004, at 09:02 PM, Kent Sibilev wrote:
On Mar 11, 2004, at 7:19 PM, Bret Pettichord wrote:
Bret Pettichord, Software Tester
Consultant - www.pettichord.com
Author - www.testinglessons.com
Blogger - www.io.com/~wazmo/blog
Homebrew Automation Seminars
March 19, Redmond, Washington
April 30, Austin, Texas
www.pettichord.com/training.html