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..

Ruby

require 'chilkat'

success = false

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")