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Search & replace PDF text or images in C# (UWP)

Sample C# (UWP) code to use PDFTron SDK for searching and replacing text strings and images inside existing PDF files (e.g. business cards and other PDF templates). Unlike PDF forms, the ContentReplacer works on actual PDF content and is not limited to static rectangular annotation regions. Learn more about our PDF Editing & Manipulation Library.

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using System;
using System.IO;
using System.Threading.Tasks;
using Windows.Foundation;

using pdftron.PDF;

using PDFNetUniversalSamples.ViewModels;

namespace PDFNetSamples
{
    public sealed class ContentReplacerTest : Sample
    {
        public ContentReplacerTest() :
            base("ContentReplacer", "This sample shows how to use 'pdftron.PDF.ContentReplacer' to search and replace text strings and images in existing PDF (e.g. business cards and other PDF templates).")
        {
        }

        public override IAsyncAction RunAsync()
        {
            return Task.Run(new System.Action(async () => {
                WriteLine("--------------------------------");
                WriteLine("Starting ContentReplacer Test...");
                WriteLine("--------------------------------\n");
			    // The following example illustrates how to replace an image in a certain region,
			    // and how to change template text.
			    try
			    {
                    String input_file_path = Path.Combine(InputPath, "BusinessCardTemplate.pdf");
                    WriteLine("Opening input file " + input_file_path );
				    PDFDoc doc = new PDFDoc(input_file_path);
				    doc.InitSecurityHandler();

				    // first, replace the image on the first page
				    ContentReplacer replacer = new ContentReplacer();
                    pdftron.PDF.Page page = doc.GetPage(1);
                    //pdftron.SDF.SDFDoc sdoc = new pdftron.SDF.SDFDoc(doc);
                    pdftron.PDF.Image img = pdftron.PDF.Image.Create(doc.GetSDFDoc(), Path.Combine(InputPath, "peppers.jpg"));
				    replacer.AddImage(page.GetMediaBox(), img.GetSDFObj());
				    // next, replace the text place holders on the second page
				    replacer.AddString("NAME", "John Smith");
				    replacer.AddString("QUALIFICATIONS", "Philosophy Doctor"); 
				    replacer.AddString("JOB_TITLE", "Software Developer"); 
				    replacer.AddString("ADDRESS_LINE1", "#100 123 Software Rd"); 
				    replacer.AddString("ADDRESS_LINE2", "Vancouver, BC"); 
				    replacer.AddString("PHONE_OFFICE", "604-730-8989"); 
				    replacer.AddString("PHONE_MOBILE", "604-765-4321"); 
				    replacer.AddString("EMAIL", "info@pdftron.com"); 
				    replacer.AddString("WEBSITE_URL", "http://www.pdftron.com"); 
				    // finally, apply
				    replacer.Process(page);

                    String output_file_path = Path.Combine(OutputPath, "BusinessCard.pdf");
                    await doc.SaveAsync(output_file_path, 0);
				    doc.Destroy();
                    WriteLine("Done. Result saved in " + output_file_path);
                    await AddFileToOutputList(output_file_path).ConfigureAwait(false);
			    }
			    catch (Exception e)
			    {
                    WriteLine(GetExceptionMessage(e));
                }

			    // The following example illustrates how to replace text in a given region
			    try {
                    String input_file_path = Path.Combine(InputPath, "newsletter.pdf");
                    PDFDoc doc = new PDFDoc(input_file_path);
				    doc.InitSecurityHandler();

				    ContentReplacer replacer = new ContentReplacer();
                    pdftron.PDF.Page page = doc.GetPage(1);
                    pdftron.PDF.Rect target_region = page.GetMediaBox();
				    string replacement_text = "hello hello hello hello hello hello hello hello hello hello";
				    replacer.AddText(target_region, replacement_text);
				    replacer.Process(page);

                    String output_file_path = Path.Combine(OutputPath, "ContentReplaced.pdf");
                    await doc.SaveAsync(output_file_path, 0);
				    doc.Destroy();
                    WriteLine("Done. Result saved in " + output_file_path);
                    await AddFileToOutputList(output_file_path).ConfigureAwait(false);
			    }
			    catch (Exception e)
			    {
                    WriteLine(GetExceptionMessage(e));
                }
                WriteLine("\n--------------------------------");
                WriteLine("Done ContentReplacer Test.");
                WriteLine("--------------------------------\n");
            })).AsAsyncAction();
		}
	}
}
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