"void" value in Data Sets external file?

Question

Hi I'm trying to achieve what I thought it was a simple thing (and turned out not to be so):
I'm importing a set of variables and values from an external file via menu Import/Dataset/Apply...
Occasionally, I'd like not to return any value from an specific field, an let it as is (with it's current value/content in the photoshop layer).
I tried setting the empty separator,void and null with no success.
Example:
(file.txt):
mytext1,mytext2,logo,backgroundimage (fields)
dude,sometext,void,myimage.jpg (values)
also tried:
mytext1,mytext2,logo,backgroundimage
dude,sometext,,myimage.jpg
and finally:
mytext1,mytext2,logo,backgroundimage
dude,sometext,null,myimage.jpg
With null, void or ,, I'm trying that photoshop ignores this field and takes it's current layer value.
Is this possible?
thanks in advance

Answer 1

I think that with scripting you could get close to useing null/blank values.
The script would have to read the original dataset text file one line at a time and create a new dataset text file to import then apply. If it found a null or undefined value it would replace that value with the current value before writing the new file. I think that it would only work with text and visibility. I not sure how it could handle image replacement.
Here are some functions you will need.
fileImportDataSets = function( file ) {
    var desc = new ActionDescriptor();
        var ref = new ActionReference();
        ref.putClass( stringIDToTypeID( "dataSetClass" ) );
    desc.putReference( charIDToTypeID( "null" ), ref );
    desc.putPath( charIDToTypeID( "Usng" ), new File( file ) );
    desc.putEnumerated( charIDToTypeID( "Encd" ), stringIDToTypeID( "dataSetEncoding" ), stringIDToTypeID( "dataSetEncodingAuto" ) );
    desc.putBoolean( stringIDToTypeID( "eraseAll" ), true );
    desc.putBoolean( stringIDToTypeID( "useFirstColumn" ), true );
executeAction( stringIDToTypeID( "importDataSets" ), desc, DialogModes.NO );
function applyDataSet(setName);{
    var desc = new ActionDescriptor();
        var setRef = new ActionReference();
        setRef.putName( stringIDToTypeID( "dataSetClass" ), setName );
    desc.putReference( charIDToTypeID( "null" ), setRef );
executeAction( charIDToTypeID( "Aply" ), desc, DialogModes.NO );