(Ruby) Update a String Property in XMP

Demonstrates how to open a JPG or TIF image file, access the XMP metadata, and update the value of a string property. (If the string property does not already exist, it is created.)

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

require 'chilkat'

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

xmp = Chilkat::CkXmp.new()

# Load a JPG or TIF image file.
success = xmp.LoadAppFile("qa_data/xmp/AJ_123642_1511.tif")
if (success != true)
    print xmp.lastErrorText() + "\n";
    exit
end

print "Num embedded XMP docs: " + xmp.get_NumEmbedded().to_s() + "\n";

# This example assumes that XMP metadata is already present in the image file.
if (xmp.get_NumEmbedded() == 0)
    print "No XMP metadata already exists.." + "\n";
    exit
end

# Get the XMP metadata.

# xml is a CkXml
xml = xmp.GetEmbedded(0)

# Show the XML:
print xml.getXml() + "\n";

# Update (overwrite) a string property.
xmp.AddSimpleStr(xml,"NumberofTimes","123")

success = xmp.SaveAppFile("qa_output/updated.tif")
if (success != true)
    print xmp.lastErrorText() + "\n";
    exit
end

print "Success." + "\n";