I am trying to extract and save a certain portion of a PDF file using specific coordinates (x,y,w,h). I am using the following code, which seems to be working okay:
Function CroppedPdf(Source As Byte(), PageNumber As Integer,
Rect As System.Drawing.Rectangle) As MemoryStream
Dim reader As New PdfReader(Source)
Dim h = reader.GetPageSize(1).Height
Dim document = New iTextSharp.text.Document(New iTextSharp.text.Rectangle(
Rect.Right / 300 * 72, h - (Rect.Top / 300 * 72), Rect.Left / 300 * 72,
h - (Rect.Bottom / 300 * 72)))
document.SetMargins(0, 0, 0, 0)
Dim destination = New MemoryStream
Dim writer = PdfWriter.GetInstance(document, destination)
document.Open()
Dim cb = writer.DirectContent
document.NewPage()
Dim page = writer.GetImportedPage(reader, 1)
cb.AddTemplate(page, 0, 0)
document.Close()
Return destination
End Function
The problem is that the resulting pdf is only seemingly cropped. When I try to run text extraction on it, I get back the text of the entire original source document. Furthermore, when splitting up a page in 10 pieces, the same document is actually stored 10 times with differences only in the viewport. How can I truly crop the PDF file, storing only the exact portion of the file I am interested in?
