Scripting for batch asset export to dxf

Hi, hee is something I use for a similar setup, exporting to jpeg.

The file is set up as a symbol sheet, so all objects are in the library, and instances are placed on the artboard

var doc = app.activeDocument;
if(!doc.selection.length)
	doc.selectObjectsOnActiveArtboard();
var sel = doc.selection.slice();
var fn = doc.fullName.fsName;
var tfn = fn.replace('.ai', ''); 
alert(tfn);
var fo = new Folder(tfn);
if(!fo.exists) fo.create();
var ndoc = app.documents.add();
//alert(ndoc.artboards[0].artboardRect)
var jpgopts = new ExportOptionsJPEG();
var lfdnr = 1;
var changed = 0;
var toplayer = ndoc.layers[0];
var problems = [];
for(var n = 0 ; n < sel.length ; n++)
{	var ob = sel[n];
	ob.selected = false;
	var nm;
	if(ob.typename == 'SymbolItem')
	{	nm = ob.symbol.name;
	}
	else if(ob.name)   // in case something has not been converted to symbol
		nm = ob.name;
	else
	{	nm = 'tmp_'+lfdnr++;
		continue;
	}
	var nob = ob.duplicate(ndoc, ElementPlacement.PLACEATEND);
	nob.move(toplayer, ElementPlacement.PLACEATEND);
	var dfn = tfn + '/' + nm + '.jpg';
	var dfo = new File(dfn);
	nob.top = nob.left = 0;
	var wd = nob.width, ht = nob.height;
	var sc = 224 * 100 / Math.min(wd, ht);
	try {
		jpgopts.verticalScale = jpgopts.horizontalStyle = sc;
		ndoc.exportFile(dfo, ExportType.JPEG, jpgopts);
		toplayer.pageItems.removeAll();
	} catch(e) { alert(nm+' '+e); }
}
ndoc.close(SaveOptions.DONOTSAVECHANGES);
alert('finish');

.All output files go to a folder naed like the original art file

where are the symbols? on the artboard or in the symbols panel?

can you post a sample file?