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downloading files

Marcelo Barbudas

9/3/2008 10:57:00 AM

Hi,

Which is the proper way to download a binary file?

Trying:
open(temp_path,"w").write(open(http_path).read)

returns truncated files

Cheers,
M.
3 Answers

Tim Hunter

9/3/2008 1:22:00 PM

0

Marcelo Barbudas wrote:
> Hi,
>
> Which is the proper way to download a binary file?
>
> Trying:
> open(temp_path,"w").write(open(http_path).read)
>
> returns truncated files
>
> Cheers,
> M.
>
>

Are you on Windows? Try opening the output file as "wb" instead of just "w".

Here's a snippet from my RMagick OS X installer script. Ara Howard gave
me the code. 'uri' is the input URI, something like
"http://rubyforge.org/frs/download.php/39890/RMagick-2.5.2.ta...

begin
open(uri) do |fin|
open(File.basename(uri), "w") do |fout|
while (buf = fin.read(8192))
fout.write buf
end
end
end
rescue Timeout::Error
abort <<-END_HTTP_DL_TIMEOUT
A timeout occurred while downloading #{uri}.
Probably this is a temporary problem with the host.
Try again later.
END_HTTP_DL_TIMEOUT
end


--
RMagick: http://rmagick.ruby...

Lex Williams

9/3/2008 1:29:00 PM

0

Marcelo Barbudas wrote:
> Hi,
>
> Which is the proper way to download a binary file?
>
> Trying:
> open(temp_path,"w").write(open(http_path).read)
>
> returns truncated files
>
> Cheers,
> M.

here is a snippet that should work :

require "rubygems"
require "mechanize"

agent = WWW::Mechanize.new
agent.get(link_to_download).save_as("name_of_the_file")
--
Posted via http://www.ruby-....

TPReal

9/3/2008 1:38:00 PM

0

Marcelo Barbudas wrote:
> Hi,
>
> Which is the proper way to download a binary file?
>
> Trying:
> open(temp_path,"w").write(open(http_path).read)
>
> returns truncated files
>
> Cheers,
> M.

Without Mechanize, it's in fact better to do it in two lines:

data=open(remote).read
File::open(local,"wb"){|f| f<<data}

Because now you don't create an empty file in case of net error.
http://al2o3-cr.blogspot.com/2008/08/downloading...

TPR.
--
Posted via http://www.ruby-....