Ruby on Rails

I dont know if it's related to the actual error message you are
getting, but I believe your send_data call should look more like this:
send_data(report.imagedata, :disposition => 'inline', :type => 'image/
png', :filename => "graph.png")
You are setting it to a GIF, and not setting the disposition to
inline.

On Apr 30, 1:27 am, Fearless Fool <li...@ruby-forum.com> wrote:
> I'm trying to display a generated .png plot via send_data(), but it
> results in a server error "invalid byte sequence in US-ASCII" error.
> I'm pretty sure this means that I need to specify the encoding
> somewhere, but I haven't been able to figure out where or how to do so.
>
> Some particulars:
>
> I'm running gnuplot through a pipe to generate a plot in .png format.
> (I've tested the code by writing its output to a file and displaying it
> -- it works.)  My Report model receives the .png image as a string:
>
>   class Report << ActiveRecord::Base
>     def imagedata
>       image = GnuPlot(@gnuplot_commands)
>     end
>   end
>
> My Controller uses send_data() to serve up a page:
>
>   class ReportsController < ApplicationController
>     def plot
>       report = Report.find(params[:id])
>       send_data(report.imagedata, :type => 'image/gif')
>     end
>   end
>
> [FWIW, without really understanding it, I also tried added an :encoding
> => 'utf8' to the send_data call -- no change.] Finally, my View presents
> the result:
>
>   <img src="<%= url_for(:controller => 'reports', :action => 'plot')
> -%>" />
>
> However, the send_data() call results in a server error:
>
> ArgumentError (invalid byte sequence in US-ASCII):
>   <internal:prelude>:8:in `synchronize'
>   .../Ruby/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
>
> So the question: Where do I specify the encoding?  And what encoding is
> appropriate for a .png binary?
>
> BTW:
> "rails --version" => Rails 2.3.5
> "ruby --version" => ruby 1.9.1p376
> "mysqul --vesion" => Ver 14.14 Distrib 5.1.36
> OS = Mac OS X 10.5.8
> --
> Posted viahttp://www.ruby-forum.com/.
>
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