Problema clase PrintDocument

[mamen]

Hola a todos necesito ayuda urgente, me estoy volviendo loca con este tema. Estoy utilizando la clase PrintDocument para imprimir un archivo q tengo en memoria en un MemoryStream, pero el ejemplo viene en visual basic mis preguntas son:
1. No entiendo cómo relaciona el PrintDocument con el StreamReader.
2. Esta linea de codigo

AddHandler pd.PrintPage, AddressOf Me.pd_PrintPage
cómo se traduce a delphi.

3. Cómo se asocia el parametro ev As PrintPageEventArgs del método pd_PrintPage

Por favor, agradecería que alguien me pudiera ayudar. Muchas gracias por adelantado. El código completo lo adjunto a continuacion.

CODIGO COMPLETO

Public Class PrintingExample
    Inherits System.Windows.Forms.Form
    Private components As System.ComponentModel.Container
    Private printButton As System.Windows.Forms.Button
    Private printFont As Font
    Private streamToPrint As StreamReader
    
    Public Sub New()
        ' The Windows Forms Designer requires the following call.
        InitializeComponent()
    End Sub    
    
    ' The Click event is raised when the user clicks the Print button.
    Private Sub printButton_Click(sender As Object, e As EventArgs)
        Try
            streamToPrint = New StreamReader("C:\My Documents\MyFile.txt")
            Try
                printFont = New Font("Arial", 10)
                Dim pd As New PrintDocument()
                AddHandler pd.PrintPage, AddressOf Me.pd_PrintPage
                pd.Print()
            Finally
                streamToPrint.Close()
            End Try
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
    End Sub    
    
    ' The PrintPage event is raised for each page to be printed.
    Private Sub pd_PrintPage(sender As Object, ev As PrintPageEventArgs)
        Dim linesPerPage As Single = 0
        Dim yPos As Single = 0
        Dim count As Integer = 0
        Dim leftMargin As Single = ev.MarginBounds.Left
        Dim topMargin As Single = ev.MarginBounds.Top
        Dim line As String = Nothing
        
        ' Calculate the number of lines per page.
        linesPerPage = ev.MarginBounds.Height / printFont.GetHeight(ev.Graphics)
        
        ' Print each line of the file.
        While count < linesPerPage
            line = streamToPrint.ReadLine()
            If line Is Nothing Then
                Exit While
            End If      
            yPos = topMargin + count * printFont.GetHeight(ev.Graphics)
            ev.Graphics.DrawString(line, printFont, Brushes.Black, leftMargin, yPos, New StringFormat())
            count += 1
        End While
        
        ' If more lines exist, print another page.
        If Not (line Is Nothing) Then
            ev.HasMorePages = True
        Else
            ev.HasMorePages = False
        End If
    End Sub