(Ruby) Extract data:image/png;base64 from HTML

Demonstrates how to extract base64 image data from HTMl and save to files..

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

require 'chilkat'

sb = Chilkat::CkStringBuilder.new()
bd = Chilkat::CkBinData.new()
sbFilename = Chilkat::CkStringBuilder.new()
index = 1

success = sb.LoadFile("qa_data/html/oresp body.txt","utf-8")
# Assume success.
print "length = " + sb.get_Length().to_s() + "\n";

mayHaveMore = true
while mayHaveMore == true

    # Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
    sBase64 = sb.getBetween("data:image/png;base64,","'")

    # If nothing is found, then we'll exit the loop because there are no more.
    mayHaveMore = sb.get_LastMethodSuccess()

    if (sb.get_LastMethodSuccess() == true)
        # Found something.
        # Load into bd and save.
        success = bd.LoadEncoded(sBase64,"base64")

        sbFilename.SetString("qa_output/png_")
        sbFilename.AppendInt(index)
        sbFilename.Append(".png")

        bd.WriteFile(sbFilename.getAsString())

        # Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
        sb.ReplaceFirst("data:image/png;base64","data:image-png;base64")
    end

    index = index + 1
end

# Restore our replacements..
count = sb.Replace("data:image-png;base64","data:image/png;base64")

print "All done." + "\n";