How to get word co-ordinates from textpdf using iTextsharp?

Public Sub GetPDFText(ByVal pdfpath As String)
    Dim reader As New PdfReader(pdfpath)
    Dim output As New StringWriter()
    For i As Integer = 1 To reader.NumberOfPages
        output.WriteLine(PdfTextExtractor.GetTextFromPage(reader, i, New SimpleTextExtractionStrategy()))
    Next
    pdftext.Text = output.ToString
    Dim filenam As String = "D:\Temp\itext\test.txt"
    Dim testss As New System.IO.StreamWriter(filenam)
    testss.Write(pdftext.Text)
    testss.Close()
        End Sub