Update metadata on active document

[emiliep89320758]

Hi,

I'm trying to add new XMP metadata on active document in InDesign CC2018 and it doesn't work.

If I run my code on a closed indesign file, it works.

What's wrong ? We could update metadata on active document, couldn't we  ?

Here is my code :

// load XMP Library
function loadXMPLibrary(){
    if ( ExternalObject.AdobeXMPScript){
        try{ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');}
        catch (e){alert('Unable to load the AdobeXMPScript library!'); return false;}
    }
    return true;
}
var myFile= app.activeDocument.fullName;
// check library and file
if(loadXMPLibrary() && myFile != null){
   xmpFile = new XMPFile(myFile.fsName, XMPConst.FILE_INDESIGN, XMPConst.OPEN_FOR_UPDATE);  
   var myXmp = xmpFile.getXMP();
}
if(myXmp){
    var destNamespace = "myNamespace";
    // define new namespace
    XMPMeta.registerNamespace(destNamespace,"ns2");
    // insert nodes
    myXmp.setProperty(destNamespace,"creator","creator1");
    [...]
    // put XMP into file
    if (xmpFile.canPutXMP(myXmp)){xmpFile.putXMP(myXmp);}else{alert("Error storing XMP");}
    // close file
    xmpFile.closeFile(XMPConst.CLOSE_UPDATE_SAFELY);
}

Got this exception :

XMP Exception : Open, other failure

Thanks

[Dirk Becker]

Document file locking might have improved, if it previously worked I would consider that a bug.

Instead of ExtendScript's XMP library you could work straight on the InDesign document's MetadataPreference object ...

[emiliep89320758 · Accepted solution]

Thanks for your answer.

I don't know how to add metadata with custom namespace working on the InDesign document's MetadataPreference object.
In documentation (if I read well), it is written that document.metadataPreferences is a read-only property.

I tried to do it thanks to that :

var doc = app.activeDocument;
var metadataPreferences = doc.metadataPreferences;
metadataPreferences.setProperty("myNamespace", "myProperty", "myValue");

It doesn't work, even if I save document after that.

But, it seems to work with a known namespace like in this example :

var myDocXMP = app.activeDocument.metadataPreferences;
var destNamespace = "http://ns.adobe.com/xap/1.0/";
var destNodeName = "MyTesting";
var nodeValue = "test value";
myDocXMP.setProperty(destNamespace, destNodeName, nodeValue);

It seems like if I want to use custom namespace, I have to use this method :

var myXML = new XML("<x:xmpmeta xmlns:x=\"adobe:ns:meta/\"><rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"><rdf:Description xmlns:TestXMP=\"https://test.wordpress.com/\"></rdf:Description></rdf:RDF></x:xmpmeta>");
var myXMLfile = File('C:/Users/myUser/Desktop/myTestXMP.xml');
if ( myXMLfile.open('e') ){
   myXMLfile.write(myXML);
   myXMLfile.close();
   app.activeDocument.metadataPreferences.append(myXMLfile);
   myXMLfile.remove();
}
var myDocXMP = app.activeDocument.metadataPreferences;
var destNamespace = "https://test.wordpress.com/";
var destNodeName = "MyTestingNode2";
var nodeValue = " test value";
myDocXMP.setProperty(destNamespace, destNodeName, nodeValue);

It seems to work on active document.

Reference :

Storing custom data into InDesign file via XMP | IndiSnip [InDesign® Snippets]