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 <[email protected]> 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/. > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/rubyonrails-talk?hl=en. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
