Develop Reference

save as iText.Layout.Element.Image in folder

i want to save pdf page as image but no success. i am able to create iText.Layout.Element.Image from pdf with itext7 but stuck here
using var pdfreader = new PdfReader("../../../documents/valid.pdf");
PdfDocument origPdf = new PdfDocument(pdfreader);
PdfPage origPage = origPdf.GetPage(1);
using var stream = new MemoryStream();
using var pdfwriter = new PdfWriter(stream);
PdfDocument pdf = new PdfDocument(pdfwriter);
Document document = new Document(pdf);
PdfFormXObject pageCopy = origPage.CopyAsFormXObject(pdf);
Image image = new Image(pageCopy);
// want to save this image

The iText 7 Image class is (according to JavaDocs) a layout element that represents an image for inclusion in the document model. It essentially can wrap arbitrary contents to be added to the contents of some page (or form XObject, ...) in an image like manner. It is not, however, an arbitrary-content-to-bitmap converter.
If you want to render a page as a bitmap using iText 7 components, consider using the iText 7 Core add-on pdfRender.

iText7 - Add text to the bottom of existing pdf

I need to add some text content to the bottom of an existing .pdf document with iText. I have a working method, but the new content is displayed in the top-left corner, overlapping the existing content:
public PdfDocument GetDocumentWithAppendedContent(string path, string content)
{
var stream = new MemoryStream();
var writer = new PdfWriter(stream);
writer.SetCloseStream(false); // so I can reuse stream to create a readonly document later
var pdfResult = new PdfDocument(new PdfReader(path), writer);
var document = new Document(pdfResult);
var div = new Div().SetMargin(0).SetPadding(0).SetKeepTogether(true);
div.Add(new Paragraph(content));
document.Add(div);
document.Close();
pdfResult.Close();
stream.Position = 0;
return new PdfDocument(new PdfReader(stream)); // return a readonly version
}
How to "move" the content at the bottom of the last page, instead of the beginning of the first? I am new to iText and, surprisingly, can't find a solution online.

You can do it using the code like this.
PdfPage page = doc.GetPage(doc.GetNumberOfPages());
//Create canvas fro the last page
Canvas canvas = new Canvas(page, page.GetPageSize());
//Set fixed position to put the div at the left bottom corner of the canvas
div.SetFixedPosition(0, 0, page.getPageSize().getWidth());
canvas.Add(p);
doc.Close();

Drawing on PDF using ITextSharp, without creating a new PDF

i try to draw simple shapes (rectangles, circles..) on an existing PDF using ITextSharp, without having to create a new PDF. I found a post who talk about this issue (itextsharp modify existing pdf (no new source pdf) and add watermark) and i would like to know if anybody could tell me more about it.
my aim is to modify a pdf by adding a circle on it, the current solution involve the creation of a new PDF (Itextsharp). Is it possible to add a circle on a PDF without creating a new one ?
Thank you.
J.

You can't read a file and write to it simultaneously. Think of how Word works: you can't open a Word document and write directly to it. Word always creates a temporary file, writes the changes to it, then replaces the original file with it and then throws away the temporary file.
You can do that too:
read the original file with PdfReader,
create a temporary file for PdfStamper, and when you're done,
replace the original file with the temporary file.
Or:
read the original file into a byte[],
create PdfReader with this byte[], and
use the path to the original file for PdfStamper.
This second option is more dangerous, as you'll lose the original file if you do something that causes an exception in PdfStamper.
As for adding content with PdfStamper, please take a look at the section entitled "Manipulating existing PDFs" in the free ebook The Best iText Questions on StackOverflow. You'll find questions such as:
How to add a watermark to a PDF file?
How do I insert a hyperlink to another page with iTextSharp in an existing PDF?
iText - How to stamp image on existing PDF and create an anchor
...
All of these examples add content by creating a PdfContentByte instance like this:
PdfContentByte canvas = stamper.getOverContent(pagenumber);
It's this canvas you need to use when drawing a circle on the page with page number pagenumber. It is important that you use the correct coordinates when you do this. That's explained here: How to position text relative to page using iText?
Update:
Json posted the following code in the comments:
string oldFile = #"C:\Users\ae40394\Desktop\hello.pdf";
string newFile = #"C:\Users\ae40394\Desktop\NEW.pdf";
// creating a reader with the original PDF
PdfReader reader = new PdfReader(oldFile);
Rectangle rect = reader.GetPageSize(1);
FileStream fs = new FileStream(newFile,FileMode.Create);
using (PdfStamper stamper = new PdfStamper(reader, fs)) {
// modify the pdf content
PdfContentByte cb = stamper.GetOverContent(1);
cb.SetColorStroke(iTextSharp.text.BaseColor.GREEN);
cb.SetLineWidth(5f);
cb.Circle(rect.GetLeft() + 30, rect.GetBottom() + 30 ,20f);
cb.Stroke();
}
reader.Close();
File.Replace(#"C:\Users\ae40394\Desktop\NEW.pdf", #"C:\Users\ae40394\Desktop\hello.pdf", #"C:\Users\ae40394\Desktop\hello.pdf.bac");
I slightly adapted the code, because:
There is no need for a Document object,
The stamper is closed when using is closed,
When the stamper is closed, so is the FileStream
the coordinates of the circle were hard coded. I used the page size to make sure they are made relative to the origin of the coordinate system, although to be sure, you may also want to check if there's a Crop Box.

You CAN read a file and write to it simultaneously.
Here is an example:
private void button4_Click(object sender, EventArgs e)
{
using (PdfReader pdfReader = new PdfReader(new FileStream(pdfInput, FileMode.Open, FileAccess.Read, FileShare.Read)))
{
using (PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileStream(pdfInput, FileMode.Open, FileAccess.Write, FileShare.None)))
{
PdfContentByte canvas = pdfStamper.GetUnderContent(1);
canvas.SetColorFill(BaseColor.YELLOW);
canvas.Rectangle(36, 786, 66, 16);
canvas.Fill();
}
}
// PDF Datei im Anschluss anzeigen/öffnen
System.Diagnostics.Process.Start(pdfInput);
}

string oldFile = #"C:\...6166-21.pdf";
string newFile = #"C:\...NEW.pdf";
// open the reader
PdfReader reader = new PdfReader(oldFile);
Rectangle size = reader.GetPageSizeWithRotation(1);
Document document = new Document(size);
FileStream fs = new FileStream(newFile, FileMode.Create, FileAccess.Write);
PdfWriter writer = PdfWriter.GetInstance(document, fs);
document.Open();
// the pdf content
PdfContentByte cb = writer.DirectContent;
cb.SetColorStroke(iTextSharp.text.BaseColor.GREEN);
cb.Circle(150f, 150f, 50f);
cb.Stroke();
// create the new page and add it to the pdf
PdfImportedPage page = writer.GetImportedPage(reader, 1);
cb.AddTemplate(page, 0, 0);
// close the streams and voilá the file should be changed :)
document.Close();
fs.Close();
writer.Close();
reader.Close();

Altering PDF through iTextSharp to Replace some existing text with a new text

Please tell me if is there any function in iTextSharp that dose replace(”xx”,”yy”) function in the pdf file without altering remaining parts of the file.

Short answer: NO you cannot do that with iText.
Longer Answer: PDF is a display format, so when the PDF is rendered many decisions are made about page and character layout and positioning. Chapter 6 of iText in Action has a great description in the introduction of why it is not a trivial task. You can read Chapter 6 for free from the publisher's website.

I found a way to do this through PDF form Fields.
String formFile = Server.MapPath("~/") + "source.pdf";
String newFile = Server.MapPath("~/") + "sink.pdf";
PdfReader reader = new PdfReader(formFile);
PdfStamper stamper = new PdfStamper(reader, new FileStream(newFile, FileMode.Create));
AcroFields fields = stamper.AcroFields;
// set form fields
fields.SetField("{TO}", "John Doe");
fields.SetField("{FROM}", "2 Milky Way, London");
stamper.FormFlattening = true;
stamper.Close();

How to create multiple copies documents with iText

I'm using iText to generate a PDF document that consists of several copies of almost the same information.
E.g.: An invoice. One copy is given to the customer, another is filed and a third one is given to an accountant for book-keeping.
All the copies must be exactly the same except for a little piece of text that indicates who is the copy to (Customer, Accounting, File, ...).
There are two possible scenarios (I don't know if the solution is the same for both of them):
a) Each copy goes in a different page.
b) All the copies goes in the same page (the paper will have cutting holes to separete copies).
There will be a wrapper or helper class which uses iText to generate the PDF in order to be able to do something like var pdf = HelperClass.CreateDocument(DocuemntInfo info);. The multiple-copies problem will be solved inside this wrapper/helper.
What does iText provides to accomplish this? Do I need to write each element in the document several times in different positions/pages? Or does iText provide some way to write one copy to the document and then copy it to other position/page?
Note: It's a .Net project, but I tagged the question with both java and c# because this qustion is about how to use iText properly the answer will help both laguage developers.

If each copy goes on a different page, you can create a new document and copy in the page multiple times. Using iText in Java you can do it like this:
// Create output PDF
Document document = new Document(PageSize.A4);
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
PdfContentByte cb = writer.getDirectContent();
// Load existing PDF
PdfReader reader = new PdfReader(templateInputStream);
PdfImportedPage page = writer.getImportedPage(reader, 1);
// Copy first page of existing PDF into output PDF
document.newPage();
cb.addTemplate(page, 0, 0);
// Add your first piece of text here
document.add(new Paragraph("Customer"));
// Copy second page of existing PDF into output PDF
document.newPage();
cb.addTemplate(page, 0, 0);
// Add your second piece of text here
document.add(new Paragraph("Accounting"));
// etc...
document.close();
If you want to put all the copies on the same page, the code is similar but instead of using zeroes in addTemplate(page, 0, 0) you'll need to set values for the correct position; the numbers to use depend on the size and shape of your invoice.
See also iText - add content to existing PDF file — the above code is based on the code I wrote in that answer.

Here's how I see this working.
PdfReader reader = new PdfReader( templatePDFPath );
Document doc = new Document();
PdfWriter writer = PdfWriter.createInstance( doc, new FileOutputStream("blah.pdf" ) );
PdfImportedPage inputPage = writer.getImportedPage( reader, 1 );
PdfDirectContent curPageContent = writer.getDirectContent();
String extraStuff[] = getExtraStuff();
for (String stuff : extraStuff) {
curPageContent.saveState();
curPageContent.addTemplate( inputPage /*, x, y*/ );
curPageContent.restoreState();
curPageContent.beginText();
curPageContent.setTextMatrix(x, y);
curPageContent.setFontAndSize( someFont, someSize );
// the actual work:
curPageContent.showText( stuff );
curPageContent.EndText();
// save the contents of curPageContent out to the file and reset it for the next page.
doc.newPage();
}
That's the bare minimum of work on the computer's part. Quite Efficient, and it'll result in a smaller PDF. Rather than having N copies of that page, with tweaks, you have one copy of that page that's reused on N pages, with little tweaks on top.
You could do the same thing, and use the "x,y" parameters in addTemplate to draw them all on the same page. Up to you.
PS: you'll need to figure out the coordinates for setTextMatrix in advance.

You could also use PDfCopy Or PDfSmartCopy to do this.
PdfReader reader = new PdfReader("Path\To\File");
Document doc = new Document();
PdfCopy copier = new PdfCopy(doc, ms1);
//PdfSmartCopy copier = new PdfSmartCopy(doc, ms1);
doc.Open();
copier.CloseStream = false;
PdfImportedPage inputPage = writer.GetImportedPage(reader, 1);
PdfContentByte curPageContent = writer.DirectContent;
for (int i = 0; i < count; i++)
{
copier.AddPage(inputPage);
}
doc.Close();
ms1.Flush();
ms1.Position = 0;
The difference between PdfCopy and PdfSmartCopy is that PdfCopy copies the entire PDF for each page, while PdfSmartCopy outputs a PDF that internally contains only one copy and all pages reference it, resulting in a smaller file and less bandwidth on a network, however it uses more memory on the server and takes longer to process.