''' <summary>
''' Prints information about interactive form of PDF document.
''' </summary>
''' <param name="pdfFilename">The filename of PDF document.</param>
Public Shared Sub PrintInformationAboutPdfInteractiveForm(pdfFilename As String)
    ' open PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename)
        ' if PDF document has interactive form
        If document.InteractiveForm IsNot Nothing Then
            ' get reference to the interactive form
            Dim form As Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfDocumentInteractiveForm = document.InteractiveForm

            ' get an array that contains all interactive form fields of PDF document
            Dim formFields As Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormField() = form.GetTerminalFields()

            ' print information abount field count
            System.Console.WriteLine("Interactive Form Field Count: {0}", formFields.Length)

            ' for each interactive field
            For Each field As Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormField In formFields
                ' output information about interactive field
                System.Console.WriteLine(vbTab & "Name={0,-18} TypeName={1,-33} TextQuadding={2,-14} IsReadOnly={3,-5}", field.FullyQualifiedName, field.[GetType]().Name, field.TextQuadding, field.IsReadOnly)
            Next
        End If
    End Using
End Sub

' This code example produces the following output:
  Interactive Form Field Count: 13
      Name=TextField1         TypeName=PdfInteractiveFormTextField       TextQuadding=Centered       IsReadOnly=False
      Name=TextField2         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
      Name=TextField3         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
      Name=TextField4         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
      Name=TextField5         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
      Name=TextField6         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
      Name=NumericField       TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
      Name=FileSelect         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
      Name=browseButton       TypeName=PdfInteractiveFormPushButtonField TextQuadding=LeftJustified  IsReadOnly=False
      Name=Calculator.Left    TypeName=PdfInteractiveFormTextField       TextQuadding=Centered       IsReadOnly=False
      Name=Calculator.Right   TypeName=PdfInteractiveFormTextField       TextQuadding=Centered       IsReadOnly=False
      Name=Calculator.Result  TypeName=PdfInteractiveFormTextField       TextQuadding=Centered       IsReadOnly=True
      Name=ResetButton        TypeName=PdfInteractiveFormPushButtonField TextQuadding=LeftJustified  IsReadOnly=False
  

/// <summary>
/// Prints information about interactive form of PDF document.
/// </summary>
/// <param name="pdfFilename">The filename of PDF document.</param>
public static void PrintInformationAboutPdfInteractiveForm(string pdfFilename)
{
    // open PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document =
        new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename))
    {
        // if PDF document has interactive form
        if (document.InteractiveForm != null)
        {
            // get reference to the interactive form
            Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfDocumentInteractiveForm form = document.InteractiveForm;

            // get an array that contains all interactive form fields of PDF document
            Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormField[] formFields = form.GetTerminalFields();

            // print information abount field count
            System.Console.WriteLine("Interactive Form Field Count: {0}", formFields.Length);

            // for each interactive field
            foreach (Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormField field in formFields)
            {
                // output information about interactive field
                System.Console.WriteLine("\tName={0,-18} TypeName={1,-33} TextQuadding={2,-14} IsReadOnly={3,-5}",
                    field.FullyQualifiedName, field.GetType().Name, field.TextQuadding, field.IsReadOnly);
            }
        }
    }
}

/* This code example produces the following output:
Interactive Form Field Count: 13
    Name=TextField1         TypeName=PdfInteractiveFormTextField       TextQuadding=Centered       IsReadOnly=False
    Name=TextField2         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
    Name=TextField3         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
    Name=TextField4         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
    Name=TextField5         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
    Name=TextField6         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
    Name=NumericField       TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
    Name=FileSelect         TypeName=PdfInteractiveFormTextField       TextQuadding=LeftJustified  IsReadOnly=False
    Name=browseButton       TypeName=PdfInteractiveFormPushButtonField TextQuadding=LeftJustified  IsReadOnly=False
    Name=Calculator.Left    TypeName=PdfInteractiveFormTextField       TextQuadding=Centered       IsReadOnly=False
    Name=Calculator.Right   TypeName=PdfInteractiveFormTextField       TextQuadding=Centered       IsReadOnly=False
    Name=Calculator.Result  TypeName=PdfInteractiveFormTextField       TextQuadding=Centered       IsReadOnly=True
    Name=ResetButton        TypeName=PdfInteractiveFormPushButtonField TextQuadding=LeftJustified  IsReadOnly=False
*/