Lua

Get a Structure Property Value from XMP

See more XMP Examples

Demonstrates how to open a JPG or TIF image file, access the XMP metadata, and fetch the value of a structure property, such as the Iptc4xmpCore:CiTelWork (found within the Iptc4xmpCore:CreatorContactInfo structure). Lua

local chilkat = require("chilkat")

-- This requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

local xmp = chilkat.Xmp.new()

-- Load a JPG or TIF image file.
-- Sample JPG's with XMP metadata may be found at:
-- http://www.chilkatsoft.com/testData/xmp/sample1.jpg
-- http://www.chilkatsoft.com/testData/xmp/sample2.jpg
-- http://www.chilkatsoft.com/testData/xmp/sample3.jpg
local success = xmp:load_app_file("sample1.jpg")
if not success then
    print(xmp.last_error_text)
    return
end

print("Num embedded XMP docs: " .. xmp.num_embedded)

-- Assuming there is at least one, get the 1st.
-- (There is typically never more than one, but theoretically it's possible.)
local xml = xmp:get_embedded(0)
if xmp.last_method_success then
    local propVal = xmp:get_struct_value(xml, "Iptc4xmpCore:CreatorContactInfo", "Iptc4xmpCore:CiTelWork")
    if not xmp.last_method_success then
        print("Not found.")
    else
        print(propVal)
    end
else
    print(xmp.last_error_text)
end