# Rmagick and captcha **URL:** \ **Category:** Rails\ **Created:** [March 9, 2006, 9:51pm UTC](https://www.ruby-forum.com/t/rmagick-and-captcha/79211 "2006-03-09T21:51:44Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![rorra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/df788c/32.png) [@rorra](https://www.ruby-forum.com/u/rorra)\ **Post date:** [March 9, 2006, 9:51pm UTC](https://www.ruby-forum.com/t/rmagick-and-captcha/79211/1 "2006-03-09T21:51:44Z")
Has anyone implemented a captcha with ruby on rails and rmagick? I tried this example: [http://wiki.rubyonrails.com/rails/pages/HowtoSecureFormsWithNoisyImages](http://wiki.rubyonrails.com/rails/pages/HowtoSecureFormsWithNoisyImages) but I got an error: undefined method `size’ for #NoisyImage:0x34d8070 Thank you * * * Rodrigo D. Iplan Networks Datos Personales removed\_email\_address@domain.invalid removed\_email\_address@domain.invalid www.iplan.com.ar www.rorra.com.ar 5031-6303 15-5695-6027 ---
**Author:** ![rorra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/df788c/32.png) [@rorra](https://www.ruby-forum.com/u/rorra)\ **Post date:** [March 9, 2006, 10:25pm UTC](https://www.ruby-forum.com/t/rmagick-and-captcha/79211/2 "2006-03-09T22:25:18Z")
Hi Rodrigo, I am the author of the article in your msg. I am not sure how you are getting that error. The NoisyImage class has no other methods defined other than the initialize code. Which gets called when you do session[:noisy\_image] = NoisyImage.new(6). The image size is hard coded in the NoisyImage class and you can change it to whatever size you want on this line, in the NoisyImage class… canvas.new\_image(32\*len, 50, Magick::TextureFill.new(granite)) If you’d like you can create some vars named height and width and use them instead. width = 32 (or whatever - this is a per character width which gets multiplied by the length of the code string, which you can also change in you call to NoisyImage.new(length) I have it hard coded at six chars. height = 50 canvas.new\_image(width\*len, height, Magick::TextureFill.new(granite)) Hope it solves your problem. bakki ---
**Author:** ![rorra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/df788c/32.png) [@rorra](https://www.ruby-forum.com/u/rorra)\ **Post date:** [March 9, 2006, 11:32pm UTC](https://www.ruby-forum.com/t/rmagick-and-captcha/79211/3 "2006-03-09T23:32:41Z")
Hi bakki I just copy and pastle your code and it’s working now, thank you, you did a great job, very easy to implement 😉 * * * Rodrigo D. Iplan Networks removed\_email\_address@domain.invalid www.iplan.com.ar 5031-6303 Datos Personales removed\_email\_address@domain.invalid www.rorra.com.ar 15-5695-6027 -----Mensaje original----- De: removed\_email\_address@domain.invalid [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] En nombre de Bakki K. Enviado el: Jueves, 09 de Marzo de 2006 06:25 p.m. Para: removed\_email\_address@domain.invalid Asunto: Re: [Rails] rmagick and captcha Hi Rodrigo, I am the author of the article in your msg. I am not sure how you are getting that error. The NoisyImage class has no other methods defined other than the initialize code. Which gets called when you do session[:noisy\_image] = NoisyImage.new(6). The image size is hard coded in the NoisyImage class and you can change it to whatever size you want on this line, in the NoisyImage class… canvas.new\_image(32\*len, 50, Magick::TextureFill.new(granite)) If you’d like you can create some vars named height and width and use them instead. width = 32 (or whatever - this is a per character width which gets multiplied by the length of the code string, which you can also change in you call to NoisyImage.new(length) I have it hard coded at six chars. height = 50 canvas.new\_image(width\*len, height, Magick::TextureFill.new(granite)) Hope it solves your problem. bakki On 3/9/06, Rodrigo D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Has anyone implemented a captcha with ruby on rails and rmagick? > I tried this example: [http://wiki.rubyonrails.com/rails/pages/HowtoSecureFormsWithNoisyImages](http://wiki.rubyonrails.com/rails/pages/HowtoSecureFormsWithNoisyImages) > removed\_email\_address@domain.invalid > [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails) * * * Rails mailing list removed\_email\_address@domain.invalid [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails) ---
**Author:** ![rorra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/df788c/32.png) [@rorra](https://www.ruby-forum.com/u/rorra)\ **Post date:** [March 9, 2006, 11:35pm UTC](https://www.ruby-forum.com/t/rmagick-and-captcha/79211/4 "2006-03-09T23:35:44Z")
There is something that I just can’t understand… In the article, you wrote this: def protect unless session[:noisy\_image] session[:noisy\_image] = NoisyImage.new(6) session[:code] = session[:noisy\_image].code end end def code\_image image = session[:noisy\_image].code\_image send\_data image, :type =\> ‘image/jpeg’, :disposition =\> ‘inline’ end but if I write def code\_image image = NoisyImage.new(6) send\_data image, :type =\> ‘image/jpeg’, :disposition =\> ‘inline’ end the image is not displaying anymore, and I don’t know why… (actually, that was the error that I was getting before) * * * Rodrigo D. Iplan Networks removed\_email\_address@domain.invalid www.iplan.com.ar 5031-6303 Datos Personales removed\_email\_address@domain.invalid www.rorra.com.ar 15-5695-6027 -----Mensaje original----- De: removed\_email\_address@domain.invalid [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] En nombre de Bakki K. Enviado el: Jueves, 09 de Marzo de 2006 06:25 p.m. Para: removed\_email\_address@domain.invalid Asunto: Re: [Rails] rmagick and captcha Hi Rodrigo, I am the author of the article in your msg. I am not sure how you are getting that error. The NoisyImage class has no other methods defined other than the initialize code. Which gets called when you do session[:noisy\_image] = NoisyImage.new(6). The image size is hard coded in the NoisyImage class and you can change it to whatever size you want on this line, in the NoisyImage class… canvas.new\_image(32\*len, 50, Magick::TextureFill.new(granite)) If you’d like you can create some vars named height and width and use them instead. width = 32 (or whatever - this is a per character width which gets multiplied by the length of the code string, which you can also change in you call to NoisyImage.new(length) I have it hard coded at six chars. height = 50 canvas.new\_image(width\*len, height, Magick::TextureFill.new(granite)) Hope it solves your problem. bakki On 3/9/06, Rodrigo D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Has anyone implemented a captcha with ruby on rails and rmagick? > I tried this example: [http://wiki.rubyonrails.com/rails/pages/HowtoSecureFormsWithNoisyImages](http://wiki.rubyonrails.com/rails/pages/HowtoSecureFormsWithNoisyImages) > removed\_email\_address@domain.invalid > [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails) * * * Rails mailing list removed\_email\_address@domain.invalid [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails) ---
**Author:** ![rorra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/df788c/32.png) [@rorra](https://www.ruby-forum.com/u/rorra)\ **Post date:** [March 10, 2006, 2:23pm UTC](https://www.ruby-forum.com/t/rmagick-and-captcha/79211/5 "2006-03-10T14:23:54Z")
That was the error, thank you for your time * * * Rodrigo D. Iplan Networks removed\_email\_address@domain.invalid www.iplan.com.ar 5031-6303 Datos Personales removed\_email\_address@domain.invalid www.rorra.com.ar 15-5695-6027 -----Mensaje original----- De: removed\_email\_address@domain.invalid [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] En nombre de Bakki K. Enviado el: Viernes, 10 de Marzo de 2006 12:44 a.m. Para: removed\_email\_address@domain.invalid Asunto: Re: [Rails] rmagick and captcha On 3/9/06, Rodrigo D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > end Here’s the problem. WHen you do … image = NoisyImage.new(6) you are creating a NoisyImage object. The actual image binary is contained in the @code\_image instance variable. If you see the code there are two accessor methods. First is :code (string) and the other :code\_image (binary image data). So you will have to send it in your example as… send\_data image.code\_image, :type =\> ‘image/jpeg’, :disposition =\> ‘inline’ In my code I had done that earlier in the line… image = session[:noisy\_image].code\_image since I was saving the noisy\_image object in the session. Hope that clarifies. bakki > the image is not displaying anymore, and I don’t know why… > (actually, > Datos Personales > > Hope it solves your problem. > > bakki > > On 3/9/06, Rodrigo D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > Has anyone implemented a captcha with ruby on rails and rmagick? > > I tried this example: [http://wiki.rubyonrails.com/rails/pages/HowtoSecureFormsWithNoisyImages](http://wiki.rubyonrails.com/rails/pages/HowtoSecureFormsWithNoisyImages) > > removed\_email\_address@domain.invalid > > removed\_email\_address@domain.invalid > > [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails) * * * Rails mailing list removed\_email\_address@domain.invalid [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails) ---
**Author:** ![rorra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/df788c/32.png) [@rorra](https://www.ruby-forum.com/u/rorra)\ **Post date:** [March 10, 2006, 4:44am UTC](https://www.ruby-forum.com/t/rmagick-and-captcha/79211/6 "2006-03-10T04:44:16Z")
On 3/9/06, Rodrigo D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > end Here’s the problem. WHen you do … image = NoisyImage.new(6) you are creating a NoisyImage object. The actual image binary is contained in the @code\_image instance variable. If you see the code there are two accessor methods. First is :code (string) and the other :code\_image (binary image data). So you will have to send it in your example as… send\_data image.code\_image, :type =\> ‘image/jpeg’, :disposition =\> ‘inline’ In my code I had done that earlier in the line… image = session[:noisy\_image].code\_image since I was saving the noisy\_image object in the session. Hope that clarifies. bakki ---
**Author:** ![rorra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/df788c/32.png) [@rorra](https://www.ruby-forum.com/u/rorra)\ **Post date:** [March 10, 2006, 8:16pm UTC](https://www.ruby-forum.com/t/rmagick-and-captcha/79211/7 "2006-03-10T20:16:02Z")
You are welcome. Glad to help. -bakki