Write StringIO to Tempfile

Question

I am trying in ruby to read image from url and than save it to Tempfile to be later processed.

require 'open-uri'  url = 'http://upload.wikimedia.org/wikipedia/commons/8/89/Robie_House.jpg' file = Tempfile.new(['temp','.jpg']) stringIo = open(url) # this is part I am confused about how to save StringIO to temp file? file.write stringIo 

This does not work that is resulting temp.jpg is not valid image. Not sure how to proceed with this.

Thanks

Answer 1

You're super close:

file.binmode file.write stringIo.read 

open(url) is just opening the stream for reading. It doesn't actually read the data until you call .read on it (which you can then pass in to file.write).

Answer 2

You could also create your tempfile with the correct encoding, like so:

file = Tempfile.new(['temp','.jpg'], :encoding => 'ascii-8bit')

This is the same as setting the file to binmode.