From: Patrick Plattes <patrick@...>
Date: 2006-12-01T02:07:06+09:00
Subject: Download a file piece by piece

Hello people :-),

i have a question about downloading files. I want to download a file and 
print out how many bytes are downloaded. That's important to me, because 
i want to have a progress bar later.

The problem is that it looks like my code downloads the whole file and 
after that it executes the while loop - this behavior is useless for me.

does anyone know how to fix it or knows a better solution?

Thanks,
  Patrick

A working example:

require 'open-uri'

FILE_BUFFER_SIZE = 65536
filename = "dailysourcecode-39523-11-30-2006.mp3"
url = 
"http://m-uk.podshow.com/media/21/episodes/39523/dailysourcecode-39523-11-30-2006.mp3"

open(url, "r") do |input|
     open(filename, "w") do |output|
         bytes_downloaded = 0
         while (buffer = input.read(FILE_BUFFER_SIZE))
             output.write(buffer)
             bytes_downloaded += FILE_BUFFER_SIZE
             puts bytes_downloaded
         end
     end
end