How to add a blank page to a pdf using iTextSharp?
- by Russell
I am trying to do something I thought would be quite simple, however it is not so straight forward and google has not helped.
I am using iTextSharp to merge PDF documents (letters) together so they can all be printed at once. If a letter has an odd number of pages I need to append a blank page, so we can print the letters double-sided.
Here is the basic code I have at the moment for merging all of the letters:
// initiaise
MemoryStream pdfStreamOut = new MemoryStream();
Document document = null;
MemoryStream pdfStreamIn = null;
PdfReader reader = null;
int numPages = 0;
PdfWriter writer = null;
for int(i = 0;i < letterList.Count; i++)
{
byte[] myLetterData = ...;
pdfStreamIn = new MemoryStream(myLetterData);
reader = new PdfReader(pdfStreamIn);
numPages = reader.NumberOfPages;
// open the streams to use for the iteration
if (i == 0)
{
document = new Document(reader.GetPageSizeWithRotation(1));
writer = PdfWriter.GetInstance(document, pdfStreamOut);
document.Open();
}
PdfContentByte cb = writer.DirectContent;
PdfImportedPage page;
int importedPageNumber = 0;
while (importedPageNumber < numPages)
{
importedPageNumber++;
document.SetPageSize(reader.GetPageSizeWithRotation(importedPageNumber));
document.NewPage();
page = writer.GetImportedPage(reader, importedPageNumber);
cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
}
}
I have tried using:
document.SetPageSize(reader.GetPageSizeWithRotation(1));
document.NewPage();
at the end of the for loop for an odd number of pages without success.
Any help would be much appreciated!
