Command line vs COM with DefaultPrinter

From the command line, example

PDFCreator.exe /IF"C:\\Temp\\" /OF"C:\\temp\\my.PDF"  /NoStart


I do not have to set the .cDefaultprinter

but if I use COM, I have to set have    .cDefaultprinter="PDFCreator"


Is there some way to use COM without having to set    .cDefaultprinter="PDFCreator"  ?


I have a web page where users will be using the   .cConvertFile   to create PDF's.

Also on the command line, I placed a "/NoStart" to keep the PDFCreator window from popping up.

A newbie, just learning about this product...