Diff between ps file(post script file) to print pdf and indd to print pdf

In InDesign workflows avoid PostScript. Do not use EPS nor print to PS/PDF.

If you place graphics use PDF/X-4, avoid PDF/X-1a, X-3 or EPS.

If you're sending the PDF to a commercial printer, get the PDF specs from them, normally you'd select PDF/X-4.

First of all, yours is an antiquated workflow. You should be Exporting to PDF directly. The PDF format has well surpaseed Postscript in its abilities to render all sorts of modern aspects of a document, most importantly Transparency.

What exactly are you doing that cannot be done by exporting to PDF??

Even if your odd workflow requires using Distiller externally, you still need a Postscript file for that, so, no, you cannot skip that step. Pease describe exactly what you want to accomplish.

Have a look at the SnpExportDocAsPDF class in SnpExportDocAsPDF.cpp.

I don't think I completely understand your question, but there are a lot of reasons NOT to use.ps and distiller. Using that method does not support tranparency, layers or color management, for example.

Have you tried the recommended approach of exporting PDF direct from InDesign?

if i am not genrationg print pdf from post script file