An example of using PhantomJS from Ruby to do server-side rendering of a web page into a PNG

webpage2png.rb

require 'rubygems' if RUBY_VERSION < '1.9'
require 'tempfile'

require File.join(ENV['JETPAC_PATH'], 'library/logger')
require File.join(ENV['JETPAC_PATH'], 'library/email')

def image_command(command)
  log "IMG: Running '#{command}'"
  result = system(command)
  if !result
    error_message = "image_command() failed with code #{$?}: '#{command}'"
    send_report_email('Image error', error_message)
    raise error_message
  end
end

def webpage2image(url, cookies)

  output_data = nil
  begin
    cookies_file = Tempfile.new('webpage2image_cookies')
    cookies.each do |domain, domain_cookies|
      cookies_file.puts("[#{domain}]")
      domain_cookies.each do |name, value|
        value.gsub!(/\n/, "")
        cookies_file.puts("#{name}=#{value}")
      end
    end
    cookies_file.close

    # Looks weird, but this reserves a guaranteed-unique filename for the output
    output_file = Tempfile.new('webpage2image_output')
    output_file.close
    output_file_path = output_file.path+'.png'
    
    command = 'xvfb-run --server-args="-screen 0, 1280x960x24" '
    command += File.join(ENV['PHANTOMJS_PATH'], 'bin/phantomjs')+' '
    command += '--cookies-file='+cookies_file.path+' '
    command += File.join(ENV['PHANTOMJS_PATH'], 'examples/rasterize.js')+' '
    command += url+' '
    command += output_file_path+' '
    image_command(command)

    result_file = File.open(output_file_path, 'rb')
    output_data = result_file.read
    result_file.close

  rescue Exception => e
    log "webpage2image exception: #{e}: #{e.message}"
    raise e  
  ensure
    # Delete the temporary files
    if cookies_file then cookies_file.unlink end
    if output_file then output_file.unlink end
    if output_file_path then File.delete(output_file_path) end
  end
   
  output_data
end

if __FILE__ == $0

  image_data = webpage2image('http://petewarden.typepad.com', {})
  
  File.open('petewarden.png', 'w').write(image_data)
  
end

This is what i seem to be looking for (generating image thumbnails in ruby). Could you perhaps help a bit on how to implement this?

This is the full blog post it's associated with: http://petewarden.typepad.com/searchbrowser/2011/11/how-to-post-a-screenshot-of-your-app-to-a-users-facebook-account.html Does that help?

…

On Tue, May 15, 2012 at 2:47 PM, Travis < ***@***.*** > wrote: This is what i seem to be looking for (generating image thumbnails in ruby). Could you perhaps help a bit on how to implement this? --- Reply to this email directly or view it on GitHub: https://gist.github.com/1398869