gistfile1.rb

require 'gtk3'
require 'open-uri'
require 'tempfile'
require 'flickraw'

class RubyApp < Gtk::Window

  def initialize
    super
    
    set_title "Titel"
    signal_connect "destroy" do 
      Gtk.main_quit end
      
    set_default_size 300, 200
    maximize
    set_window_position Gtk::Window::Position::CENTER 
    
    FlickRaw.api_key=
    FlickRaw.shared_secret=

    results = flickr.photos.search(:tags => "tag", :per_page => 1)
    results.each {|currentresult| 
       
    image_path = Tempfile.open("display-web-image-in-gtk") do |tempfile|
        urlimage = open(FlickRaw.url_b(currentresult))
        tempfile.write(urlimage.read)
        tempfile.path
      end
      begin
        currentpixbuf = Gdk::Pixbuf.new(image_path)
      rescue IOError => e
        puts e
        puts "cannot load images"
        exit
      end
      myheight = currentpixbuf.height
      puts myheight
      if myheight > 700
        mywidth = currentpixbuf.width
        newwidth=(mywidth*(700.0/myheight)).round
        currentpixbuf=currentpixbuf.scale(newwidth,700,Gdk::Pixbuf::INTERP_BILINEAR)
        end
      if (defined?(@gtkimage)).nil?
        @gtkimage = Gtk::Image.new  :pixbuf => currentpixbuf
        add @gtkimage
        else
        @gtkimage.set_pixbuf(currentpixbuf)
      end
      show_all
#      window.invalidate(@gtkimage, true)
#      window.process_all_updates
#      window.process_updates(true)
      puts image_path
      }
  end
end

Gtk.init
  window = RubyApp.new
Gtk.main