static void Main(string[] args)
{
// If using Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");
PdfDocument document = PdfDocument.Load("Reading.pdf");
// Get document's trailer dictionary.
var trailer = document.GetDictionary();
// Get document catalog dictionary from the trailer.
var catalog = (PdfDictionary)((PdfIndirectObject)trailer[PdfName.Create("Root")]).Value;
// Either retrieve "PieceInfo" entry value from document catalog or create a page-piece dictionary and set it to document catalog under "PieceInfo" entry.
PdfDictionary pieceInfo;
var pieceInfoKey = PdfName.Create("PieceInfo");
var pieceInfoValue = catalog[pieceInfoKey];
switch (pieceInfoValue.ObjectType)
{
case PdfBasicObjectType.Dictionary:
pieceInfo = (PdfDictionary)pieceInfoValue;
break;
case PdfBasicObjectType.IndirectObject:
pieceInfo = (PdfDictionary)((PdfIndirectObject)pieceInfoValue).Value;
break;
case PdfBasicObjectType.Null:
pieceInfo = PdfDictionary.Create();
catalog[pieceInfoKey] = PdfIndirectObject.Create(pieceInfo);
break;
default:
throw new InvalidOperationException("PieceInfo entry must be dictionary.");
}
// Create page-piece data dictionary for "GemBox.Pdf" conforming product and set it to page-piece dictionary.
var data = PdfDictionary.Create();
pieceInfo[PdfName.Create("GemBox.Pdf")] = data;
// Create a private data dictionary that will hold private data that "GemBox.Pdf" conforming product understands.
var privateData = PdfDictionary.Create();
data[PdfName.Create("Data")] = privateData;
// Set "Title" and "Version" entries to private data.
privateData[PdfName.Create("Title")] = PdfString.Create(ComponentInfo.Title);
privateData[PdfName.Create("Version")] = PdfString.Create(ComponentInfo.Version);
// Specify date of the last modification of "GemBox.Pdf" private data (required by PDF specification).
data[PdfName.Create("LastModified")] = PdfString.Create("D:" + DateTimeOffset.Now.ToString("yyyyMMddHHmmssK", CultureInfo.InvariantCulture).Replace(':', '\'') + "'", PdfEncoding.ASCII, PdfStringForm.Literal);
document.SaveOptions.CloseOutput = true;
document.Save("Basic Objects.pdf");
}
