To find text or images and replace it in a PDF.

PDFDoc doc(filename);
ContentReplacer replacer;
Page page = doc.GetPage(1);

// replace an image on the page
Rect target_region = page.GetMediaBox();
Image img = Image::Create(doc, imagename);
replacer.AddImage(target_region, img.GetSDFObj());

// replace a text placeholder
replacer.AddString("NAME", "John Smith");

// replace text in a given region
UString text("hello world");
replacer.AddText(target_region, text);
replacer.Process(page);

Replace PDF text or images
Full code sample which 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).