Reading files from the internet into RMagick

ruby-talk
1

I am not sure how to go about doing this. I would like to get a file
given an URL. The I would like to mess around with that file, but I am
having a hard time actually initializing the Magick::Image object.

I read the image using open-uri like so:
require 'rmagick'
require 'open-uri'
include Magick

open(url) do |f|
  image = from_blob(f.read)
end

However, it turns out that f is of type "Tempfile" and calling read
returns "" and read(int) returns nil. So I don't know where to go from
here. How can this be done?

Thanks,
-Szymon

2

Does this work?
open(url, 'rb') do |f|
  image = from_blob(f.read)
end

···

On 9/21/06, Szymon Rozga <szymon.rozga@gmail.com> wrote:

I am not sure how to go about doing this. I would like to get a file
given an URL. The I would like to mess around with that file, but I am
having a hard time actually initializing the Magick::Image object.

I read the image using open-uri like so:
require 'rmagick'
require 'open-uri'
include Magick

open(url) do |f|
  image = from_blob(f.read)
end

However, it turns out that f is of type "Tempfile" and calling read
returns "" and read(int) returns nil. So I don't know where to go from
here. How can this be done?

3

That works. I wasn't aware of the way binary IO was done in Ruby.
Thanks!

-Szymon

Wilson Bilkovich wrote:

···

On 9/21/06, Szymon Rozga <szymon.rozga@gmail.com> wrote:
> I am not sure how to go about doing this. I would like to get a file
> given an URL. The I would like to mess around with that file, but I am
> having a hard time actually initializing the Magick::Image object.
>
> I read the image using open-uri like so:
> require 'rmagick'
> require 'open-uri'
> include Magick
>
> open(url) do |f|
> image = from_blob(f.read)
> end
>
>
> However, it turns out that f is of type "Tempfile" and calling read
> returns "" and read(int) returns nil. So I don't know where to go from
> here. How can this be done?

Does this work?
open(url, 'rb') do |f|
  image = from_blob(f.read)
end