PrimitiveSample.cs :  » PDF » PDF-Clown » it » stefanochizzolini » clown » samples » C# / CSharp Open Source

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C# / CSharp Open Source » PDF » PDF Clown 
PDF Clown » it » stefanochizzolini » clown » samples » PrimitiveSample.cs
using it.stefanochizzolini.clown.documents;
using it.stefanochizzolini.clown.files;
using it.stefanochizzolini.clown.objects;

namespace it.stefanochizzolini.clown.samples{
  /**
    <summary>This sample demonstrates how to perform advanced editing over a PDF document structure
    accessing primitive objects.</summary>
    <remarks>In this case, it adds an 'open action' to the document so that it opens
    on page 2 magnified just enough to fit the height of the page within the window.
    By the way, note that since version 0.0.7 go-to actions are natively supported
    by PDF Clown (you don't need to work at the low level shown here!).</remarks>
  */
  public class PrimitiveSample
    : ISample
  {
    public void Run(
      SampleLoader loader
      )
    {
      // (boilerplate user choice -- ignore it)
      string filePath = loader.GetPdfFileChoice("Please select a PDF file");

      // 1. Open the PDF file!
      File file = new File(filePath);
      // Get the PDF document!
      Document document = file.Document;

      // 2. Modifying the document...
      {
        // Create the action dictionary!
        PdfDictionary action = new PdfDictionary();
        // Define the action type (in this case: go-to)!
        action[new PdfName("S")] = new PdfName("GoTo");
        // Defining the action destination...
        {
          // Create the destination array!
          PdfArray destination = new PdfArray();
          // Define the 2nd page as the destination target!
          destination.Add(document.Pages[1].BaseObject);
          // Define the location of the document window on the page (fit vertically)!
          destination.Add(new PdfName("FitV"));
          // Define window left-edge horizontal coordinate!
          destination.Add(new PdfInteger(-32768));
          // Associate the destination to the action!
          action[new PdfName("D")] = destination;
        }
        // Associate the action to the document!
        document.BaseDataObject[new PdfName("OpenAction")] = file.Register(action);  // Adds the action to the file, returning its reference.
        document.Update(); // Update the existing document object (fundamental to override previous content).
      }

      // (boilerplate metadata insertion -- ignore it)
      loader.BuildAccessories(document,this.GetType(),"Primitive objects","manipulating a document at primitive object level");

      // 3. Serialize the PDF file (again, boilerplate code -- see the SampleLoader class source code)!
      loader.Serialize(file,this.GetType().Name);
    }
  }
}
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