If you want to know about which printers are currently available to PDFCreator than you can do it as described below.
Get a reference to the COM object of PDFCreator.
var PDFCreator = new ActiveXObject("PDFCreator.PDFCreator");
Call the GetPDFCreatorPrinters property to get a reference to the Printers object.
var printers = PDFCreator.GetPDFCreatorPrinters;
Having a list with all printers, you are able to check how many printers are available and what’s their name by calling the Count property and the GetPrinterByIndex method.