Trapping error messages

honoluludesktop

When I group = entities.add_face (my_face_points), and my_face_points are not coplanar, the application crashes. The API indicates that:


if (group)
  puts "OK"
else
  puts "Failed"
end

But that didn't work for not coplanar. Is there any way to trap the error message, and continue running the application?

TIG


begin
  ### try to do something
  group = entities.add_face(my_face_points)
  result="OK."
rescue
  ### what to do if it fails
  result="MISERABLE FAILURE!"
end
UI.messagebox(result)

thomthom

@honoluludesktop said:

group = entities.add_face (my_face_points)

why are you naming the variable group when you get a face in return?
avoid space between method name and brackets.

honoluludesktop

Thanks fellows, I will try to run with those tomorrow. Tom, perhaps I should have written my_faces in place of group.

thomthom

@honoluludesktop said:

Thanks fellows, I will try to run with those tomorrow. Tom, perhaps I should have written my_faces in place of group.

It's much easier to follow the code when the variables aren't ambiguously named.

honoluludesktop

You are right, at the time it seemed OK, sorry:-(

honoluludesktop

TIG, Works great. I guess I now have to be careful not to bypass any errors that destroy the data base, and crash SU or the plugin:-)

I tried the following to aid debugging, but the failed command would not run after the Ruby panel opened.

begin
  group = @entities.add_group(@my_entities)
rescue #comes here when @my_entities is not a "add_group" entity
  result = Sketchup.send_action "showRubyPanel;"
  group = @entities.add_group(@my_entities)#this did not run
end

But I have lots of other uses for it, Thanks.

TIG

This is a fuller example using multi-rescues


begin
  # .. the process
rescue SyntaxError, NameError => ex
  print "String doesn't compile; " + ex
  # .. tidy up
rescue SystemCallError => ex
  print "System Call Error; " + ex
  # .. tidy up
rescue StandardError => ex
  print "Error running script&#058; " + ex
  # .. tidy up
ensure
  # .. this is for a 'tidy up' when there's something 'wrong' 
  # .. BUT it's NOT an 'error' per se
  # .. e.g. f.close unless f.nil?
end

If you are using it for 'testing' code then just keep the Ruby Console open...

honoluludesktop

TIG, Thanks, is there a way to open SU with the Ruby Console open? Or, do you debug by keeping SU open, then cut and paste to the Web Console?

TIG

Add Sketchup.send_action "showRubyPanel:"
into the start of your script just after require 'sketchup.rb'
BUT remember to ### it out when you are done!