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Creating a blank pdf and uploading an image to each page

I am new to file handling in asp.net core 6.0. I want to create a blank pdf and load images from the ImagePath list into it. Using the resources on the internet, I tried to create a blank pdf and throw it into it, but in vain.
I couldn't use pdfReader inside pdfStamper. It was the only resource on the Internet that I found suitable for myself.
Link to the question; Converting Multiple Images into Multiple Pages PDF using itextsharp
How can I do that my code is below.
public static string MainStamping(string docname, List < string > imagePath, string mediaField) {
var config = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
var webRootPath = config["AppSettings:urunResimPath"].ToString();
string filename = webRootPath + "\\menupdf\\" + docname + ".pdf";
// yeniisim = yeniisim + filelist.FileName;
// var fileName = "menupdf\\" + yeniisim;
FileStream pdfOutputFile = new FileStream(filename, FileMode.Create);
PdfConcatenate pdfConcatenate = new PdfConcatenate(pdfOutputFile);
PdfReader result = null;
for (int i = 0; i < imagePath.Count; i++) {
result = CreatePDFDocument1(imagePath[i], mediaField);
pdfConcatenate.AddPages(result);
}
pdfConcatenate.Close();
return filename;
}
public static PdfReader CreatePDFDocument1(string imagePath, string mediaField) {
PdfReader pdfReader = null;
//C:\Users\hilal\OneDrive\Belgeler\GitHub\Restaurant\Cafe.Web\wwwroot\assets\barkod-menu
var config = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
var webRootPath = config["AppSettings:urunResimPath"].ToString();
string image = webRootPath + "\\barkod-menu\\" + imagePath;
iTextSharp.text.Image instanceImg = iTextSharp.text.Image.GetInstance(image);
MemoryStream inputStream = new MemoryStream();
inputStream.Seek(0, SeekOrigin.Begin); //I don't know what to do here do I need to use it?
pdfReader = new PdfReader(inputStream);
MemoryStream memoryStream = new MemoryStream();
PdfStamper pdfStamper = new PdfStamper(pdfReader, memoryStream);
AcroFields testForm = pdfStamper.AcroFields;
testForm.SetField("MediaField", mediaField);
PdfContentByte overContent = pdfStamper.GetOverContent(1);
IList < AcroFields.FieldPosition > fieldPositions = testForm.GetFieldPositions("ImageField");
if (fieldPositions == null || fieldPositions.Count <= 0) throw new ApplicationException("Error locating field");
AcroFields.FieldPosition fieldPosition = fieldPositions[0];
overContent.AddImage(instanceImg);
pdfStamper.FormFlattening = true;
pdfStamper.Close();
PdfReader resultReader = new PdfReader(memoryStream.ToArray());
pdfReader.Close();
return resultReader;
}
If I want to explain visually, the blank pdf I created will be uploaded in this way. Thank you

The following shows how to create a PDF using iTextSharp (v. 5.5.13.3), and add images to the PDF (one image per page). It's been tested with .NET 6.
Pre-requisite:
Download / install NuGet package iTextSharp (v. 5.5.13.3)
Add the following using statements:
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;
In the code below the PDF is saved to a byte array, instead of a file to allow for more options.
CreatePdfDocument:
public static byte[] CreatePdfDocument(List<string> imagePaths)
{
byte[] pdfBytes;
using (MemoryStream ms = new MemoryStream())
{
using (Document doc = new Document(PageSize.LETTER, 1.0f, 1.0f, 1.0f, 1.0f))
{
using (PdfWriter writer = PdfWriter.GetInstance(doc, ms))
{
//open
doc.Open();
//create a new page for each image
for (int i = 0; i < imagePaths.Count; i++)
{
//add new page
doc.NewPage();
//get image
iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(imagePaths[i]);
//ToDo: set desired image size
//img.ScaleAbsolute(100.0f, 100.0f);
//center image on page
img.SetAbsolutePosition((PageSize.LETTER.Width - img.ScaledWidth) / 2, (PageSize.LETTER.Height - img.ScaledHeight) / 2);
//add image to page
doc.Add(img);
}
//close
doc.Close();
//convert MemoryStream to byte[]
pdfBytes = ms.ToArray();
}
}
}
return pdfBytes;
}
I've decided that all I want to do is write the PDF to a file. The method below writes the PDF to a file.
CreatePdf:
public static void CreatePdf(string filename, List<string> imagePaths)
{
//create PDF
byte[] pdfBytes = CreatePdfDocument(imagePaths);
//save PDF to file
System.IO.File.WriteAllBytes (filename, pdfBytes);
}
Resources:
How to generate PDF one page one row from datatable using iTextSharp
iTextSharp - Working with images
Center image in pdf using itextsharp
Additional Resources:
iTextSharp: How to resize an image to fit a fix size?

ItextSharp return a corrupted file after editing existing pdf file

I am new to itextSharp. What I am doing is just editing the old file and instead of saving the new file on the server I just want it to download at the time. but unfortunately after editing the file and being downloaded, file display a message cannot open the file. It may be corrupted.
Here is my code.
public FileStreamResult export( int ? id)
{
string pathin = Server.MapPath(Url.Content("~/PDF/input.pdf"));
PdfReader reader = new PdfReader(pathin);
iTextSharp.text.Rectangle size = reader.GetPageSizeWithRotation(1);
Document document = new Document(size);
// open the writer
//FileStream ms = new FileStream(pathout, FileMode.Create, FileAccess.Write);
var ms = new MemoryStream();
PdfWriter writer = PdfWriter.GetInstance(document, ms);
writer.CloseStream = false;
document.Open();
// the pdf content
PdfContentByte cb = writer.DirectContent;
// select the font properties
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
cb.SetColorFill(BaseColor.DARK_GRAY);
cb.SetFontAndSize(bf, 18f);
// write the text in the pdf content
cb.BeginText();
string text = "this is text";
// put the alignment and coordinates here
cb.ShowTextAligned(1, text, 500, 500, 0);
cb.EndText();
cb.BeginText();
text = "this is my post";
// put the alignment and coordinates here
cb.ShowTextAligned(1, text, 600, 400, 0);
cb.EndText();
// create the new page and add it to the pdf
PdfImportedPage page = writer.GetImportedPage(reader, 1);
cb.AddTemplate(page, 0, 0);
ms.Position = 0;
document.Close();
//ms.Close();
writer.Close();
reader.Close();
return File(ms, "application/pdf","test.pdf");
}
Any help will be really appreciated. :)

You change the position of the memory stream before closing the document:
ms.Position = 0;
document.Close();
As the trailer of the pdf in the result stream is written during the closing of the document, your change of stream position causes the pdf trailer to be written over the pdf header and the stream position thereafter to not be at the start.
Instead first close the document and the reader (the writer implicitly is closed by closing the document) and reset the stream position thereafter:
document.Close();
reader.Close();
ms.Position = 0;
return File(ms, "application/pdf","test.pdf");

ItextSharp Add lines to PDF and convert into bytes without saving it.

I have a method that gets a pdf and adds's lines in that pdf and then creates a new pdf and saves it in a path that's given to it. Now I don't want to save that new file in a path instead I want to convert it into bytes and send in Emails how can I do that I tried a couple of methods but it all ways look for path says no path found here is the code.
protected void CreatePDF()
{
string Oldfile = #"C:\BlankPDFt.pdf"; // Gets the Template / The actualy agreement Letter
// (new FileInfo("C:/Documents/Docs.pdf")).Directory.Create(); // Go create this folder if it's not there
string NewFile = "C:/Documents/Docs.pdf";
PdfReader reader = new PdfReader(Oldfile);
iTextSharp.text.Rectangle Size = reader.GetPageSizeWithRotation(1);
Document document = new Document(Size);
FileStream fs = new FileStream(NewFile , FileMode.Create, FileAccess.Write); // This is where it all ways look for new file path
i dont want it to save instead convert to bytes but wont work.
PdfWriter weiter = PdfWriter.GetInstance(document, fs);
document.Open();
PdfContentByte cb = weiter.DirectContent;
PdfImportedPage page = weiter.GetImportedPage(reader, 1);
cb.AddTemplate(page, 0, 0);
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
cb.SetColorFill(BaseColor.BLACK);
cb.SetFontAndSize(bf, 12);
cb.BeginText();
// string Signatur = "Some texts"; // adds this text to that pdf
cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, "Here", 335, 90, 0); // Insert the signature
cb.EndText();
}

The PdfWriter.GetInstance() method accepts an InputStream as its second argument. Instead of passing a FileStream you should pass it a MemoryStream.
MemoryStream memory_stream = new MemoryStream();
PdfWriter.GetInstance(document, memory_stream );
...
document.Close();
byte[] pdf_bytes = memory_stream.ToArray();

itextsharp adding image to existing pdf

i am trying to add an image using itextsharp but not having any luck
there are a ton of tutorials for adding an image to a new pdf doc but not and existing pdf so the .add menthod is not avaivlable
i am tring to do use the stamper write method to add image
and i dont get any errors but no image shows up
PdfReader reader = new PdfReader(pdfIn); //get pdf
if (File.Exists(pdfOut)) File.Delete(pdfOut); //reset
FileStream fs = new FileStream(pdfOut, FileMode.Create);
PdfStamper stamper = new PdfStamper(reader, fs);
try
{
// Convert base64string to bytes array
Byte[] bytes = Convert.FromBase64String(base64decode);
iTextSharp.text.Image sigimage = iTextSharp.text.Image.GetInstance(bytes);//
sigimage.SetAbsolutePosition(10, 10);
sigimage.ScaleToFit(140f, 120f);
stamper.Writer.Add(sigimage);
}catch (DocumentException dex){//log exception here
}catch (IOException ioex){//log exception here
}
AcroFields fields = stamper.AcroFields;
//repeat for each pdf form fill field
fields.SetField("agencyName", name.Value);
stamper.FormFlattening = true; // set to true to lock pdf from being editable
stamper.Writer.CloseStream = true;
stamper.Close();
reader.Close();
fs.Close();

I think you try the following adding it to bytes
PdfReader reader = new PdfReader(pdfIn)
FileStream fs = new FileStream(pdfOut, FileMode.Create);
var stamper = new PdfStamper(reader, fs);
var pdfContentByte = stamper.GetOverContent(1);
iTextSharp.text.Image sigimage = iTextSharp.text.Image.GetInstance(bytes);
sigimage.SetAbsolutePosition(100, 100);
pdfContentByte.AddImage(sigimage);

using following code you can able to add image to each page in an existing pdf file. ( I use this code for desktop application)
string FileLocation = #"C:\\test\\pdfFileName.pdf"; // file path of pdf file
var uri = new Uri(#"pack://application:,,,/projrct_name;component/View/Icons/funnelGreen.png"); // use image from project/application folder (this image will insert to pdf)
var resourceStream = Application.GetResourceStream(uri).Stream;
PdfReader pdfReader = new PdfReader(FileLocation);
PdfStamper stamp = new PdfStamper(pdfReader, new FileStream(FileLocation.Replace(".pdf", "(tempFile).pdf"), FileMode.Create));iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(System.Drawing.Image.FromStream(resourceStream), System.Drawing.Imaging.ImageFormat.Png);
img.SetAbsolutePosition(125, 350); // set the position in the document where you want the watermark to appear.
img.ScalePercent(35f);// not neccessory, use if you want to adjust image
img.ScaleToFit(140f, 100f); // not neccessory, use if you want to adjust image
PdfContentByte waterMark;
for (int page = 1; page <= pdfReader.NumberOfPages; page++) // for loop will add image to each page. Based on the condition you can add image to single page also
{
waterMark = stamp.GetOverContent(page);
waterMark.AddImage(img);
}
stamp.FormFlattening = true;
stamp.Close();// closing the pdfStamper, the order of closing must be important
pdfReader.Close();
File.Delete(FileLocation);
File.Move(FileLocation.Replace(".pdf", "(tempFile).pdf"), FileLocation);

Adding text to existing multipage PDF document in memorystream using iTextSharp

I am trying to add text to an existing PDF file using iTextSharp. I have been reading many posts, including the popular thread here.
I have some differences:
My PDF are X pages long
I want to keep everything in memory, and never have a file stored on my filesystem
So I tried to modify the code, so it takes in a byte array and returns a byte array. I have come this far:
The code compiles and runs
My out byte array has a different length than my in byte array
My problem:
I cannot see my added text when i later store the modified byte array and open it in my PDF reader
I don't get why. From every StackOverflow post I have seen, I do the same. using the DirectContent, I use BeginText and write a text. However, i cannot see it, no matter how I move the position around.
Any idea what is missing from my code?
public static byte[] WriteIdOnPdf(byte[] inPDF, string str)
{
byte[] finalBytes;
// open the reader
using (PdfReader reader = new PdfReader(inPDF))
{
Rectangle size = reader.GetPageSizeWithRotation(1);
using (Document document = new Document(size))
{
// open the writer
using (MemoryStream ms = new MemoryStream())
{
using (PdfWriter writer = PdfWriter.GetInstance(document, ms))
{
document.Open();
for (var i = 1; i <= reader.NumberOfPages; i++)
{
document.NewPage();
var baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
var importedPage = writer.GetImportedPage(reader, i);
var contentByte = writer.DirectContent;
contentByte.BeginText();
contentByte.SetFontAndSize(baseFont, 18);
var multiLineString = "Hello,\r\nWorld!";
contentByte.ShowTextAligned(PdfContentByte.ALIGN_LEFT, multiLineString,100, 200, 0);
contentByte.EndText();
contentByte.AddTemplate(importedPage, 0, 0);
}
document.Close();
ms.Close();
writer.Close();
reader.Close();
}
finalBytes = ms.ToArray();
}
}
}
return finalBytes;
}

The code below shows off a full-working example of creating a PDF in memory and then performing a second pass, also in memory. It does what #mkl says and closes all iText parts before trying to grab the raw bytes from the stream. It also uses GetOverContent() to draw "on top" of the previous pdf. See the code comments for more details.
//Bytes will hold our final PDFs
byte[] bytes;
//Create an in-memory PDF
using (var ms = new MemoryStream()) {
using (var doc = new Document()) {
using (var writer = PdfWriter.GetInstance(doc, ms)) {
doc.Open();
//Create a bunch of pages and add text, nothing special here
for (var i = 1; i <= 10; i++) {
doc.NewPage();
doc.Add(new Paragraph(String.Format("First Pass - Page {0}", i)));
}
doc.Close();
}
}
//Right before disposing of the MemoryStream grab all of the bytes
bytes = ms.ToArray();
}
//Another in-memory PDF
using (var ms = new MemoryStream()) {
//Bind a reader to the bytes that we created above
using (var reader = new PdfReader(bytes)) {
//Store our page count
var pageCount = reader.NumberOfPages;
//Bind a stamper to our reader
using (var stamper = new PdfStamper(reader, ms)) {
//Setup a font to use
var baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
//Loop through each page
for (var i = 1; i <= pageCount; i++) {
//Get the raw PDF stream "on top" of the existing content
var cb = stamper.GetOverContent(i);
//Draw some text
cb.BeginText();
cb.SetFontAndSize(baseFont, 18);
cb.ShowText(String.Format("Second Pass - Page {0}", i));
cb.EndText();
}
}
}
//Once again, grab the bytes before closing things out
bytes = ms.ToArray();
}
//Just to see the final results I'm writing these bytes to disk but you could do whatever
var testFile = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "test.pdf");
System.IO.File.WriteAllBytes(testFile, bytes);