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how read pdf layers and add to another page using itextsharp?

How can I read PDF layers and add them to another page using iTextSharp?
I want to copy layers from one PDF page and move them to another PDF page in C#.
I've tried reading from a PDF layer from one page, but I am unable to copy that layer.
var document = new Document();
FileStream outfile = new FileStream(outPutFilePath, FileMode.Create);
var writer = new PdfCopy(document, outfile);
document.Open();
foreach (var fileName in filesPath)
{
var reader = new PdfReader(fileName);
PdfStamper stamper = new PdfStamper(reader, outfile);
Dictionary<String, PdfLayer> layers = stamper.GetPdfLayers();
//PdfLayer layer = layers.get("Nested layer 1");
//layer.setOn(false);
for (var i = 1; i <= reader.NumberOfPages; i++)
{
var page = writer.GetImportedPage(reader, i);
page.ContentTagged = true;
writer.AddPage(page);
}
stamper.Close();
reader.Close();
}
writer.Close();
document.Close();

merging pdf and preserve SetTagged

I'm using iTextSharp 5.x. I'm trying to merge two pdfs and preserve the isTagged flag. When I remove copy.SetTagged(); the result pdf contains both pdfs which is great. When adding the copy.SetTagged() is get an exception
Exception -->System.ObjectDisposedException: Cannot access a closed file.
at System.IO.__Error.FileNotOpen()
at System.IO.FileStream.get_Position()
Here is the code
List<string> filesToMerge = new List<string> { "C:/dev/dcs/wp-cla-dcs/Hex/Docs/metadata/coverPage.pdf", "C:/dev/dcs/wp-cla-dcs/Hex/Docs/metadata/49W7a.pdf" };
string outputFileName = "C:/dev/dcs/wp-cla-dcs/Hex/Docs/metadata/results.pdf";
using (FileStream outFS = new FileStream(outputFileName, FileMode.Create))
using (Document document = new Document())
// using (PdfCopy copy = new PdfCopy(document, outFS))
using (PdfCopy copy = new PdfSmartCopy(document, outFS))
{
{
copy.SetTagged();
// Set up the iTextSharp document
document.Open();
foreach (string pdfFile in filesToMerge)
{
using (var reader = new PdfReader(pdfFile))
{
copy.AddDocument(reader);
copy.FreeReader(reader);
}
}
}
}

despite #bruno-lowagie's comment, I have had better results doing this with with iText5.
Uisng iText7, PdfMerger left several contents untagged (all were tagged in the source document). PdfCopy in iText5 however worked just fine, only needed to manually add Xmp metadata, title, lang, etc:
public static void CombineMultiplePDFs(string[] fileNames, string outFile)
{
var lang = "en";
var title = "My new title";
// step 1: creation of a document-object
Document document = new Document();
// step 2: we create a writer that listens to the document
FileStream newFileStream = new FileStream(outFile, FileMode.Create);
PdfCopy writer = new PdfCopy(document, newFileStream);
writer.SetTagged();
writer.PdfVersion = PdfWriter.VERSION_1_7;
writer.AddViewerPreference(PdfName.DISPLAYDOCTITLE, new PdfBoolean(true));
writer.Info.Put(PdfName.TITLE, new PdfString(title));
writer.CreateXmpMetadata();
// step 3: we open the document
document.Open();
// set meta data
document.AddLanguage(lang);
document.AddTitle(title);
// keep an array of all open readers so they can be closed again.
var readers = new PdfReader[fileNames.Length];
for (var fi = 0; fi < fileNames.Length; fi++)
{
// we create a reader for a certain document
var fileName = fileNames[0];
PdfReader reader = new PdfReader(fileName);
readers[fi] = reader;
reader.ConsolidateNamedDestinations();
// step 4: we add content
for (int i = 1; i <= reader.NumberOfPages; i++)
{
// IMPORTANT: the third param is is "KeepTaggedPdfStructure"
PdfImportedPage page = writer.GetImportedPage(reader, i, true);
writer.AddPage(page);
}
}
// step 5: we close the document and writer
writer.Close();
document.Close();
// close readers only after document is lcosed
foreach (var r in readers)
{
r.Close();
}
}

pdf stamper, pdfEventHandler not working when trying to add page number on the pdf document using itext

I am using itext to generate a pdf document but I am trying to use the existing solutions to add page number to the pdf document that is being generated but none of them seems to be working for me.
I tried using something like
using (MemoryStream stream = new MemoryStream())
{
PdfReader reader = new PdfReader(bytes);
using (PdfStamper stamper = new PdfStamper(reader, stream))
{
int pages = reader.NumberOfPages;
for (int i = 1; i <= pages; i++)
but my code doesnt recognize PdfStamper and asks me to create a class.
Similarly, I tried using
MemoryStream ms = new MemoryStream();
PdfReader reader = new PdfReader(pdf);
int n = reader.NumberOfPages;
Rectangle psize = reader.GetPageSize(1);
There is error on .NumberOfPages and .GetPageSize.
I also tried creating a separate PageEventHandler class but the problem remains same.
Right now, I am able to generate pdf but I want to add page number and I have a code like
private MemoryStream MakeDocument(Application application)
{
MemoryStream ms = new MemoryStream();
PdfWriter writer = new PdfWriter(ms);
PdfDocument pdfDocument = new PdfDocument(writer);
using (var document = new Document(pdfDocument))
{
var sections = new List<IDocumentSection>
{
new Header(),
new Projects(application.Projects),
//Footer
};
foreach (var section in sections)
section.AddTo(document);
Rectangle pageSize;
PdfCanvas canvas;
int n = pdfDocument.GetNumberOfPages();
for (int i = 1; i <= n; i++)
{
PdfPage page = pdfDocument.GetPage(i);
pageSize = page.GetPageSize();
canvas = new PdfCanvas(page);
canvas.BeginText()
.SetFontAndSize(PdfFontFactory.CreateFont(FontConstants.HELVETICA), 7)
.MoveText(pageSize.GetWidth() / 2 - 7, 10)
.ShowText(i.ToString())
.ShowText(" of ")
.ShowText(n.ToString())
.EndText();
}
}
return ms;
var outputStream = MakeDocument(application);
var response = new HttpResponseMessage
{
StatusCode = HttpStatusCode.OK,
Content = new ByteArrayContent(outputStream.ToArray())
};
response.Content.Headers.Add("Content-Type", "application/pdf");
return response;
But it is complaining at GetPageSize
Object reference not set to an instance of an object. Even if I set page size as A4, it starts to complain at canvas = new PdfCanvas(page);

It seems that you are using iText 7. Or rather, that's what I assume when I see:
PdfWriter writer = new PdfWriter(ms);
PdfDocument pdfDocument = new PdfDocument(writer);
Document document = new Document(pdfDocument);
The PdfStamper class is an iText 5 class. It doesn't exist in iText 7. See Chapter 5 of the jump-start tutorial. You probably want something like this:
MemoryStream stream = new MemoryStream();
PdfWriter writer = new PdfWriter(stream);
PdfReader reader = new PdfReader(bytes);
PdfDocument pdfDoc = new PdfDocument(reader, writer);
Document document = new Document(pdfDoc);
Rectangle pageSize;
PdfCanvas canvas;
int n = pdfDoc.GetNumberOfPages();
for (int i = 1; i <= n; i++) {
PdfPage page = pdfDoc.GetPage(i);
pageSize = page.GetPageSize();
canvas = new PdfCanvas(page);
// draw page numbers on the canvas
}
pdfDoc.close();
If you aren't using iText 7, then there's something wrong in your question. In that case you should clarify what you mean when you use the concepts PdfStamper and PdfEventHandler in the same sentence, because that doesn't make any sense.

Convert html to pdf and merge it with existing pdfs

I have a System.Net.Mail.MailMessage which shall have it's html body and pdf attachments converted into one single pdf.
Converting the html body to pdf works for me with this answer
Converting the pdf attachments into one pdf works for me with this answer
However after ~10 hours of trying I can not come up with a combined solution which does both. All I'm getting are NullReferenceExceptions somewhere in IText source, "the document is not open", etc...
For example, this will throw no error but the resulting pdf will only contain the attachments but not the html email body:
Document document = new Document();
StringReader sr = new StringReader(mail.Body);
HTMLWorker htmlparser = new HTMLWorker(document);
using (FileStream fs = new FileStream(targetPath, FileMode.Create))
{
PdfCopy writer = new PdfCopy(document, fs);
document.Open();
htmlparser.Parse(sr);
foreach (string fileName in pdfList)
{
PdfReader reader = new PdfReader(fileName);
reader.ConsolidateNamedDestinations();
for (int i = 1; i <= reader.NumberOfPages; i++)
{
PdfImportedPage page = writer.GetImportedPage(reader, i);
writer.AddPage(page);
}
PRAcroForm form = reader.AcroForm;
if (form != null)
{
writer.CopyAcroForm(reader);
}
reader.Close();
}
writer.Close();
document.Close();
}
I'm using the LGPL licensed ITextSharp 4.1.6

From v4.1.6 fanboy to v4.1.6 fanboy :D
Looks like the HTMLWorker is closing the documents stream right after parsing. So as a workaround, you could create a pdf from your mailbody in memory. And then add this one together with the attachment to your final pdf.
Here is some code, that should do the trick:
StringReader htmlStringReader = new StringReader("<html><body>Hello World!!!!!!</body></html>");
byte[] htmlResult;
using (MemoryStream htmlStream = new MemoryStream())
{
Document htmlDoc = new Document();
PdfWriter htmlWriter = PdfWriter.GetInstance(htmlDoc, htmlStream);
htmlDoc.Open();
HTMLWorker htmlWorker = new HTMLWorker(htmlDoc);
htmlWorker.Parse(htmlStringReader);
htmlDoc.Close();
htmlResult = htmlStream.ToArray();
}
byte[] pdfResult;
using (MemoryStream pdfStream = new MemoryStream())
{
Document doc = new Document();
PdfCopy copyWriter = new PdfCopy(doc, pdfStream);
doc.Open();
PdfReader htmlPdfReader = new PdfReader(htmlResult);
AppendPdf(copyWriter, htmlPdfReader); // your foreach pdf code here
htmlPdfReader.Close();
PdfReader attachmentReader = new PdfReader("C:\\temp\\test.pdf");
AppendPdf(copyWriter, attachmentReader);
attachmentReader.Close();
doc.Close();
pdfResult = pdfStream.ToArray();
}
using (FileStream fs = new FileStream("C:\\temp\\test2.pdf", FileMode.Create, FileAccess.Write))
{
fs.Write(pdfResult, 0, pdfResult.Length);
}
private void AppendPdf(PdfCopy writer, PdfReader reader)
{
for (int i = 1; i <= reader.NumberOfPages; i++)
{
PdfImportedPage page = writer.GetImportedPage(reader, i);
writer.AddPage(page);
}
}
Ofc you could directly use a FileStream for the final document instead of a MemoryStream as well.

Add an extra page to a PDF document using PDFsharp library

I am trying to merge PDF documents and add extra pages to some of them. The merge part is working fine and now I am trying to figure out how to add an extra page by passing a link to the preexisting PDF page. How can I pass a link to a PDF page to targetDoc.AddPage(LINK)?
public static void MergePDFs(string targetPath, DataTable pdfs)
{
try
{
using (PdfSharp.Pdf.PdfDocument targetDoc = new PdfSharp.Pdf.PdfDocument())
{
foreach (DataRow pdf in pdfs.Rows)
{
using (PdfSharp.Pdf.PdfDocument pdfDoc = PdfSharp.Pdf.IO.PdfReader.Open(pdf["link"].ToString(), PdfDocumentOpenMode.Import))
{
for (int i = 0; i < pdfDoc.PageCount; i++)
{
targetDoc.AddPage(pdfDoc.Pages[i]);
}
}
}
targetDoc.Save(targetPath);
}
}
catch(Exception ex)
{
Console.Write(ex);
}
}
Stamping method
using (Stream pdfStream = new FileStream(sourceFileName, FileMode.Open))
{
using (Stream newpdfStream = new FileStream(newFileNameWithPath, FileMode.Create, FileAccess.ReadWrite))
{
iTextSharp.text.pdf.PdfReader pdfReader = new iTextSharp.text.pdf.PdfReader(pdfStream);
PdfStamper pdfStamper = new PdfStamper(pdfReader, newpdfStream);
PdfContentByte pdfContentByte = pdfStamper.GetOverContent(pageNumber);
BaseFont baseFont = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1250, BaseFont.NOT_EMBEDDED);
pdfContentByte.SetColorFill(BaseColor.RED);
pdfContentByte.SetFontAndSize(baseFont, 12);
pdfContentByte.BeginText();
pdfContentByte.ShowTextAligned(PdfContentByte.ALIGN_CENTER, inputText, Convert.ToInt32(xCoordinate), Convert.ToInt32(yCoordinate), 0);
pdfContentByte.EndText();
pdfStamper.Close();
}
}

To create a new, empty page call AddPage() without parameters.
targetDoc.AddPage();
You might need Clone() to create multiple copies of an existing imported page (also add (PdfPage)):
targetDoc.AddPage((PdfPage)pdfDoc.Pages[i].Clone());