(Ruby) Decode Base64 Image String (GIF, JPG, etc.) and Save to File

I have an XML response that includes a base 64 encoded image string (UPS label). It's a huge string and I need to save it as a gif file on my users pc.

This example shows how to do it..

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

bd = Chilkat::CkBinData.new()

#  I created an extra-small GIF image for this example..
success = bd.LoadFile("qa_data/gif/xsmall.gif")
if (success != true)
    print "Failed to load GIF image file." + "\n";
    exit
end

#  Show GIF bytes as base64:
print bd.getEncoded("base64") + "\n";

#  This particular GIF in base64 is this:
#  R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7

#  Let's begin with an XML string:
x = "<abc><def>R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7</def></abc>"

xml = Chilkat::CkXml.new()
success = xml.LoadXml(x)

#  Get the base64 string:
gifBase64 = xml.getChildContent("def")

print gifBase64 + "\n";

#  Load bd with the base64 decoded bytes.
bd.Clear()
bd.AppendEncoded(gifBase64,"base64")

#  Save to a GIF file.
success = bd.WriteFile("qa_output/xsmall.gif")