PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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 Post subject: How to edit PDF content
PostPosted: Tue Jun 09, 2020 6:34 am 
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Joined: Tue Jun 09, 2020 6:22 am
Posts: 1
Hi,

I have a PDF file. And it has some common text in each page.
I want to modify that common text, like I want to put current page number in that text suppose.

How can we do it using PDF sharp.


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PostPosted: Fri Jan 22, 2021 10:41 am 
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Joined: Sat Jan 09, 2021 7:09 am
Posts: 11
Here you go! Hope this helps.

Code:
    class Program
    {
        static void Main(string[] args)
        {
            string originalPdf = @"C:\origPdf.pdf";

            CreatePdf(originalPdf);

            using (var doc = PdfReader.Open(originalPdf, PdfDocumentOpenMode.Modify))
            {
                var page = doc.Pages[0];
                var contents = ContentReader.ReadContent(page);

                ReplaceText(contents, "Hello", "Hola");
                page.Contents.ReplaceContent(contents);

                doc.Pages.Remove(page);
                doc.AddPage().Contents.ReplaceContent(contents);
               
                doc.Save(originalPdf);
            }

            Process.Start(originalPdf);

        }

        // Code from http://www.pdfsharp.net/wiki/HelloWorld-sample.ashx
        public static void CreatePdf(string filename)
        {
            // Create a new PDF document
            PdfDocument document = new PdfDocument();
            document.Info.Title = "Created with PDFsharp";

            // Create an empty page
            PdfPage page = document.AddPage();

            // Get an XGraphics object for drawing
            XGraphics gfx = XGraphics.FromPdfPage(page);

            // Create a font
            XFont font = new XFont("Verdana", 20, XFontStyle.BoldItalic, new XPdfFontOptions(PdfFontEncoding.WinAnsi));

            // Draw the text
            gfx.DrawString("Hello, World!", font, XBrushes.Black,
              new XRect(0, 0, page.Width, page.Height),
              XStringFormats.Center);

            // Save the document...
            document.Save(filename);
            // ...and start a viewer.
        }

        // Please refer to the pdf tech specs on what all entails in the content stream
        // https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf
        public static void ReplaceText(CSequence contents, string searchText, string replaceText)
        {
            // Iterate thru each content items. Each item may or may not contain the entire
            // word if there are different stylings (ex: bold parts of the word) applied to a word.
            // So you may have to replace a character at a time.
            for (int i = 0; i < contents.Count; i++)
            {
                if (contents[i] is COperator)
                {
                    var cOp = contents[i] as COperator;
                    for (int j = 0; j < cOp.Operands.Count; j++)
                    {
                        if (cOp.OpCode.Name == OpCodeName.Tj.ToString() ||
                            cOp.OpCode.Name == OpCodeName.TJ.ToString())
                        {
                            if (cOp.Operands[j] is CString)
                            {
                                var cString = cOp.Operands[j] as CString;
                                if (cString.Value.Contains(searchText))
                                {
                                    cString.Value = cString.Value.Replace(searchText, replaceText);
                                }

                            }
                        }
                    }


                }
            }


        }
    }




Best,
Reas


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