90 degree PDF rotation using iTextSharp in C #

Question

I am trying to use PDF for embossing and you need to rotate it 90 degrees in order to apply it correctly? Does anyone know how to do this? It does not seem to be found on the Internet.

Answer 1

In the Rotate90Degrees example, PdfReader is used to get an instance of the document, and then the /Rotate value is changed in each dictionary of pages. If there is no such record, the /Rotate record with the value 90 added:

 final PdfReader reader = new PdfReader(source); final int pagesCount = reader.getNumberOfPages(); for (int n = 1; n <= pagesCount; n++) { final PdfDictionary page = reader.getPageN(n); final PdfNumber rotate = page.getAsNumber(PdfName.ROTATE); final int rotation = rotate == null ? 90 : (rotate.intValue() + 90) % 360; page.put(PdfName.ROTATE, new PdfNumber(rotation)); } 

Once this is done, we use PdfStamper to save the change:

 PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); stamper.close(); reader.close(); 

This is for iText Java. For iTextSharp, porting Java to C # is easy because the terminology is identical. Change some lowercase to upper regions as follows:

 PdfDictionary page = reader.GetPageN(1); page.Put(PdfName.ROTATE, new PdfNumber(90)); 

On the question side of this post, a more or less identical piece of code: How do I rotate a PDF page using iTextSharp without causing an error in ghostscript?