Test if guides visible?

And why do you need to know the guides are visible or not?

On CS6 it's impossible to know.

You can use the function to force the visibility of the guides.

Works in CS6 and CC2018.

show_guides()
function show_guides()
    {
    try {
        var d1 = new ActionDescriptor();
        var d2 = new ActionDescriptor();
        d2.putUnitDouble( charIDToTypeID( "Pstn" ), charIDToTypeID( "#Prc" ), 200 );
        d2.putEnumerated( charIDToTypeID( "Ornt" ), charIDToTypeID( "Ornt" ), charIDToTypeID( "Hrzn" ) );
        d1.putObject( charIDToTypeID( "Nw  " ), charIDToTypeID( "Gd  " ), d2 );
        executeAction( charIDToTypeID( "Mk  " ), d1, DialogModes.NO );
        app.activeDocument.guides[app.activeDocument.guides.length-1].remove();
        }
    catch (e) { alert(e); throw(e); }
    }

Another version for CC 2018:

function sTT(v) {return stringIDToTypeID(v)}
(ref = new ActionReference()).putProperty(sTT('property'), sTT('menuBarInfo'))
ref.putEnumerated(sTT('application'), sTT('ordinal'), sTT('tergetEnum'))
Object.prototype.get = function(v) {return this.getList(sTT('submenu')).getObjectValue(v)}
executeActionGet(ref).getObjectValue(sTT('menuBarInfo')).get(8).get(18).get(0).getString(sTT('enabled'))

#target photoshop

if (app.documents.length > 0) {

var ref = new ActionReference();

ref.putProperty (stringIDToTypeID ("property"), stringIDToTypeID ("guidesVisibility"));

ref.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );

var docDesc = executeActionGet(ref);

alert (docDesc.getBoolean(stringIDToTypeID("guidesVisibility")));

};