Hyperlink in existing PDF - pdf

Question

I am trying to add a hyperlink based off of known position coordinates in the PDF. I have tried editing the physical pdf code and have added a link, but in the process deleted other content on the pdf.
[/Rect [ x x x x ]
/Action
<</Subtype /URI/URI (http://www.xxxxx.com/)>>
/Subtype /Link
/ANN pdfmark
Is there any way of adding the hyperlink without corrupting the existing pdf? Would converting to a different file format adding the link and converting back be a better approach? Possible commercial use prevents use of some gnu licensed products.

Answer 1

Debenu Quick PDF Libarary also provides a solution. I also recommend to don't edit the 'physical code' of the PDF file (with Notepad or others), because it won't give any solution - neither in other cases.
Here is a sample code how to do it with the Debenu Quick PDF Library:
/* Add a link to a webpage*/
// Set the origin for the co-ordinates to be the top left corner of the page.
DPL.SetOrigin(1);
// Adding a link to an external web page using the AddLinkToWeb function.
DPL.AddLinkToWeb(200, 100, 60, 20, "www.debenu.com", 0);
// Hyperlinks and text are two separate elements in a PDF,
//so we'll draw some text now so that you know
//where the hyperlink is located on the page.
DPL.DrawText(205, 114, "Click me!");
// When the Debenu Quick PDF Library object is initiated a blank document
// is created and selected in memory by default. So
// all we need to do now is save the document to
// the local hard disk to see the changes that we've made.
DPL.SaveToFile("link_to_web.pdf");
Member of Debenu

Answer 2

Docotic.Pdf library can add hyperlinks to existing PDFs. The library is not *GPL-licensed and can be used in commercial solutions after purchasing a license.
Below is a code that adds hyperlink on to the first page of a PDF.
using System;
using System.Drawing;
public static void AddHyperlink()
{
// NOTE:
// When used in trial mode, the library imposes some restrictions.
// Please visit http://bitmiracle.com/pdf-library/trial-restrictions.aspx
// for more information.
using (PdfDocument pdf = new PdfDocument("input.pdf"))
{
PdfPage page = pdf.Pages[0];
RectangleF rectWithLink = new RectangleF(10, 70, 200, 100);
page.AddHyperlink(rectWithLink, new Uri("http://google.com"));
pdf.Save("output.pdf");
}
}
Disclaimer: I work for the vendor of the library.