Using VB.NET PDF Annotation Library
How to create, edit, update, remove PDF file annotations and drawings using VB.NET
Sample Codes for Visual Basic .NET Users to create, edit pdf file existing annotations, comments on PDF in VB.NET Class. ASP.NET Annotate PDF function is based on .net PDF Annotate SDK.
VB.NET retrieve all annotations information from a PDFDocument
Dim inputFilePath As String = Program.RootPath + "\\" + "1_Annots.pdf"
Dim doc As PDFDocument = New PDFDocument(inputFilePath)
Dim annots = PDFAnnotHandler.GetAllAnnotations(doc)
Console.WriteLine("Number of Annotations: " + annots.Count)
If annots.Count > 0 Then
For Each annot As IPDFAnnot In annots
Console.WriteLine("Annotation")
Console.WriteLine(" Page: " + annot.PageIndex)
Console.WriteLine(" Aritst: " + annot.Artist)
Console.WriteLine(" Subject: " + annot.Subject)
Console.WriteLine(" Content: " + annot.Content)
Next
End If
vb.net retrieve all annotations information from a PDF page
Dim inputFilePath As String = Program.RootPath + "\\" + "1_Annots.pdf"
Dim doc As PDFDocument = New PDFDocument(inputFilePath)
Dim page As PDFPage = doc.GetPage(0)
Dim annots = PDFAnnotHandler.GetAllAnnotations(page)
VB.NET delete all annotations from pdf document
Dim inputFilePath As String = "C:\1_Annots.pdf"
Dim doc As PDFDocument = New PDFDocument(inputFilePath)
' get all annotations in the 1st page
Dim page As PDFPage = doc.GetPage(0)
Dim annots = PDFAnnotHandler.GetAllAnnotations(page)
' remove all annotations in the 1st page
PDFAnnotHandler.DeleteAnnotation(doc, annots)
VB.NET retrieve annotation popup note window's properties
Dim inputFilePath As String = "C:\Annot_1.pdf"
Dim doc As PDFDocument = New PDFDocument(inputFilePath)
Dim annots As List(Of IPDFAnnot) = PDFAnnotHandler.GetAllAnnotations(doc)
For Each annot As IPDFAnnot In annots
If TypeOf annot Is IPDFPopupAnnot Then
Console.WriteLine("Annotation has popup window")
Dim obj As IPDFPopupAnnot = annot
Console.WriteLine("Is open in the begin: {0}", obj.Popup.IsOpen)
Console.WriteLine("Popup window boundary: {0}", obj.Popup.Boundary.ToString())
Else
Console.WriteLine("Annotation has no popup window")
End If
Next
VB.NET retrieve annotation flags
Dim inputFilePath As String = "C:\Annot_1.pdf"
Dim doc As PDFDocument = New PDFDocument(inputFilePath)
Dim annots As List(Of IPDFAnnot) = PDFAnnotHandler.GetAllAnnotations(doc)
For Each annot As IPDFAnnot In annots
Console.WriteLine("Annotation Flags")
Console.WriteLine(" Invisible: {0}", annot.IsInvisible)
Console.WriteLine(" Hidden: {0}", annot.IsHidden)
Console.WriteLine(" Print: {0}", annot.IsPrint)
Console.WriteLine(" No Zoom: {0}", annot.NoZoom)
Console.WriteLine(" No Rotate: {0}", annot.NoRotate)
Console.WriteLine(" No View: {0}", annot.NoView)
Console.WriteLine(" Read Only: {0}", annot.IsReadOnly)
Console.WriteLine(" Locked: {0}", annot.IsLocked)
Console.WriteLine(" Toggle No View: {0}", annot.IsToggleNoView)
Console.WriteLine(" Locked Contents: {0}", annot.IsLockedContents)
Next
VB.NET set annotation flags
Dim inputFilePath As String = "C:\2.pdf"
Dim outputFilePath As String = "C:\Annot_1.pdf"
' create the annotation
Dim annot As PDFAnnotDeleteLine = New PDFAnnotDeleteLine()
annot.StartPoint = New PointF(100.0F, 200.0F)
annot.EndPoint = New PointF(300.0F, 400.0F)
' set annotation flags
annot.IsInvisible = False
annot.IsPrint = True
annot.NoRotate = True
annot.NoZoom = True
' add annotation
PDFAnnotHandler.AddAnnotation(inputFilePath, 1, annot, outputFilePath)
