# Rubyw, RuntimeError, capturing the stack, FXRuby **URL:** \ **Category:** Ruby\ **Created:** [July 28, 2010, 10:45pm UTC](https://www.ruby-forum.com/t/rubyw-runtimeerror-capturing-the-stack-fxruby/192351 "2010-07-28T22:45:22Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\ **Post date:** [July 28, 2010, 10:45pm UTC](https://www.ruby-forum.com/t/rubyw-runtimeerror-capturing-the-stack-fxruby/192351/1 "2010-07-28T22:45:22Z")
Let’s say I’m running rubyw and a RunTimeError is raised … and I’m using FXRuby (which is tangential to this question) … and I want to put up a errorbox … But I want to capture the error message that would normally go to stdout, i.e. the call stack … How would I capture the call stack to a string in a raised exception? * * * begin raise RuntimeError, “Something bad happened” rescue # What do I do here? end * * * ---
**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\ **Post date:** [July 28, 2010, 10:58pm UTC](https://www.ruby-forum.com/t/rubyw-runtimeerror-capturing-the-stack-fxruby/192351/2 "2010-07-28T22:58:50Z")
begin puts 1/0 rescue Exception, NameError =\> e print “this is an error [#{e}]” print $!.inspect #Ruby places a reference to the associated Exception object into the global variable $! end output: this is an error [divided by 0]#\ ---
**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\ **Post date:** [July 28, 2010, 11:09pm UTC](https://www.ruby-forum.com/t/rubyw-runtimeerror-capturing-the-stack-fxruby/192351/3 "2010-07-28T23:09:57Z")
Joseph, This does not give the call stack with file names and line numbers of the exception. Thanks. Ralph Wednesday, July 28, 2010, 2:58:20 PM, you wrote: JES\> begin JES\> puts 1/0 JES\> rescue Exception, NameError =\> e JES\> print “this is an error [#{e}]” JES\> print $!.inspect #Ruby places a reference to the associated Exception JES\> object into the global variable $! JES\> end JES\> output: this is an error [divided by 0]#\ > > From: Ralph S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > > Organization: Ralph S. > > Reply-To: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > > Date: Thu, 29 Jul 2010 05:44:36 +0900 > > To: ruby-talk ML [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > > Subject: rubyw, RuntimeError, capturing the stack, FXRuby > > Let’s say I’m running rubyw and a RunTimeError is raised … > > and I’m using FXRuby (which is tangential to this question) … > > and I want to put up a errorbox … > > But I want to capture the error message that would normally go to stdout, i.e. > > the call stack … > > How would I capture the call stack to a string in a raised exception? ---
**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\ **Post date:** [July 28, 2010, 11:37pm UTC](https://www.ruby-forum.com/t/rubyw-runtimeerror-capturing-the-stack-fxruby/192351/4 "2010-07-28T23:37:42Z")
Ralph S. wrote: > This does not give the call stack with file names and line numbers of > the exception. Use Exception#backtrace: irb(main):001:0\> begin irb(main):002:1\* raise “Error” irb(main):003:1\> rescue =\> e irb(main):004:1\> puts e.backtrace irb(main):005:1\> end (irb):2:in `irb_binding' /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb/workspace.rb:80:in`eval’ /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb/workspace.rb:80:in `evaluate' /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb/context.rb:216:in`evaluate’ /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb.rb:157:in `block (2 levels) in eval_input' /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb.rb:271:in`signal\_status’ /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb.rb:154:in `block in eval_input' /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb/ruby-lex.rb:244:in`block (2 levels) in each\_top\_level\_statement’ /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb/ruby-lex.rb:230:in `loop' /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb/ruby-lex.rb:230:in`block in each\_top\_level\_statement’ /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `catch' /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in`each\_top\_level\_statement’ /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb.rb:153:in `eval_input' /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb.rb:70:in`block in start’ /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb.rb:69:in `catch' /opt/rubies/ruby-1.9.1-p429/lib/ruby/1.9.1/irb.rb:69:in`start’ /home/marvin/Programmieren/Programme/irb\_/irb\_.rb:37:in `’ =\> nil irb(main):006:0\> Vale, Marvin ---
**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\ **Post date:** [July 28, 2010, 11:59pm UTC](https://www.ruby-forum.com/t/rubyw-runtimeerror-capturing-the-stack-fxruby/192351/5 "2010-07-28T23:59:43Z")
Sorry… Des this help? begin puts 1/0 rescue Exception, NameError =\> e print “this is an error [#{e}] -----\>[#{e.backtrace}]\<-------” print $!.inspect #Ruby places a reference to the associated Exception object into the global variable $! end this is an error [divided by 0] -----\>[/Users/jes/error.rb:2:in `/’/Users/jes/error.rb:2]\<------- #\