Ruby

Extract data:image/png;base64 from HTML

See more Base64 Examples

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

require 'chilkat'

success = false

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";