Foxit PDF SDK

using namespace std;
using namespace foxit;
using namespace foxit::common;
using foxit::common::Library;
using namespace pdf;
using namespace annots;
using foxit::pdf::annots::Line;

// Create a blank document
PDFDoc doc = PDFDoc();

// Add a blank A4 page to the document
PDFPage page = doc.InsertPage(0, 595, 842);

// Create a note annotation 
annots::Note note(page.AddAnnot(Annot::e_Note, RectF(10, 350, 50, 400)));

// Set note annotation properties
note.SetIconName("Comment");
note.SetSubject(L"Note");
note.SetTitle(L"Foxit SDK");
note.SetContent(L"Note annotation.");
note.SetCreationDateTime(GetLocalDateTime());
note.SetModifiedDateTime(GetLocalDateTime());
note.SetUniqueID(WString::FromLocal(RandomUID()));

// Add state annotation to note annotation
Note state = note.AddStateAnnot(Markup::e_StateModelReview, Markup::e_StateAccepted);
state.SetContent(L"Accepted set by Foxit SDK");
state.SetTitle(L"Foxit SDK");
state.SetModifiedDateTime(GetLocalDateTime());
state.SetUniqueID(WString::FromLocal(RandomUID()));
state.ResetAppearanceStream();
// Appearance should be reset.
note.ResetAppearanceStream();
cout << "Add a note annotation." << endl;

// Save PDF file
doc.SaveAs("new_document.pdf", PDFDoc::e_SaveFlagNoOriginal);

using foxit;
using foxit.common;
using foxit.common.fxcrt;
using foxit.pdf;
using foxit.pdf.annots;

using (PDFDoc doc = new PDFDoc())
{
    // Add a blank A4 page to the document
    PDFPage page = doc.InsertPage(0, 595, 842);
    
    // Get first page with index 0
    using (PDFPage page = doc.GetPage(0))
    {
        // Add note annotation
        Note note = null;
        Annot annot = null;
        using (annot = page.AddAnnot(Annot.Type.e_Note, new RectF(10, 350, 50, 400)))
        using (note = new Note(annot))
        {
            note.SetIconName("Comment");
            note.SetSubject("Note");
            note.SetTitle("Foxit SDK");
            note.SetContent("Note annotation.");
            note.SetCreationDateTime(GetLocalDateTime());
            note.SetModifiedDateTime(GetLocalDateTime());
            note.SetUniqueID(RandomUID());
        }
        
        // Add state annotation to note annotation
        using (Note state = note.AddStateAnnot(Markup.StateModel.e_StateModelReview, Markup.State.e_StateAccepted))
        {
            state.SetContent("Accepted set by Foxit SDK");
            state.SetTitle("Foxit SDK");
            state.SetModifiedDateTime(GetLocalDateTime());
            state.SetUniqueID(RandomUID());
            state.ResetAppearanceStream();
            // Appearance should be reset.
            note.ResetAppearanceStream();
            Console.WriteLine("Add a note annotation.");
        }
        
        // Save PDF file
        String newPdf = output_path + "annotation.pdf";
        doc.SaveAs(newPdf, (int)PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
    }
}