Scripting via estk

Question

Hello,
What i am trying to do is generate a jpg image from an ai file(not a drawing, but a library = not possible to open in pdf) shown in bridge.
I have my script, it is working correct when executing this in estk.
And if i understand correct, i need to create an object of illustrator in order to execute the script in my vb.net program. But, because this script has nothing to do with illustrator in general i was wondering if it is also posible to create an object of the estk program and execute the script in the background with this object instead of illustrator?
Thanks
Also another question:
When ran from vb.net, it goes in debug.
#target bridge
#targetengine "MainEngine"
function SnpCreateThumbInspectorPanel()
    try
        this.requiredContext = "\tExecute against Bridge main engine.\nBridge must be running.";
        $.level = 1; // Debugging level
        this.panelRef = null;
        //alert(arguments[0]);
        Folder("c:\\temp\\illustratorcentraliser").create();
        //LINE 17 HERE
        var loc = new Thumbnail(Folder("/C"));
        loc.open();
        this.t = new Thumbnail(File("/c/00_sym.ai"));
        app.document.select(this.t);
    catch(e) {
        alert( e + ":" + e.line );
SnpCreateThumbInspectorPanel.prototype.run = function()
    if(!this.canRun())
        return false;
    var bmd = new BitmapData(this.t.spec);
    if(bmd instanceof BitmapData)
        var expPath = "C:\\temp\\illustratorcentraliser\\" + this.t.name + ".jpg";
        bmd.exportTo(new File(expPath));
        return true;
    $.writeln("ERROR:: Cannot render thumb");
    return false;
SnpCreateThumbInspectorPanel.prototype.canRun = function()
    if(BridgeTalk.appName == "bridge") { return true; }
    $.writeln("ERROR:: Cannot render thumb");
    $.writeln(this.requiredContext);
    return false;
if(typeof(SnpCreateThumbInspectorPanel_unitTest)  == "undefined") {
    new SnpCreateThumbInspectorPanel().run();
it says
Script Alert
ReferenceError: Thumbnail does not have a constructor:17
OK  
the code i am using in vb.net is
dim illy as illustrator.application = CreateObject("Illustrator.Application")
illy.DoJavaScriptFile("C:\previewSelectedLibrary.jsx")
Message was edited by: abjelly

Answer 1

ok this is the end result for if someone should be searching for this...
Thanks.
Script that extracts thumbnail image from a given .ai drawing/library file in bridge
@arg0 = path to let bridge navigate to where the ai resides example /C/temp/
@arg1 = actual ai image path example /C/temp/img.ai
@result: jpg image is exported to expPath
#target illustrator
function script(){
    try
            Folder("/c/temp/illustratorcentraliser").create();
            var loc = new Thumbnail(Folder(_sourceFolder));
            loc.open();
            var t = new Thumbnail(File(_sourceFile));
            app.document.select(t);
            var bmd = new BitmapData(t.spec);
            if(bmd instanceof BitmapData)
                var expPath = "/C/temp/illustratorcentraliser/" + t.name + ".jpg";
                bmd.exportTo(new File(expPath));
    catch(e) {
        alert( e + ":" + e.line );
var bt = new BridgeTalk();
bt.target = "bridge";
var theScript = "var _sourceFolder = " + "" + arguments[0].toSource() + "" + "; ";
theScript += "var _sourceFile = " + "" + arguments[1].toSource() + "" + "; ";
theScript += "var BridgeScript = " + script.toSource() + "; BridgeScript(); ";
bt.body = theScript
bt.send(4);