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Set Invisible Text Over Image in PDF - VB.NET

PDF SDK sample in VB.NET demonstrating ‘Set Invisible Text Over Image in PDF’

Program.vb
Imports Bytescout.PDF

''' <summary>
''' This example demonstrates how to create PDF document from scanned document image and add invisible text over it. 
''' </summary>
Class Program

    Shared Sub Main()

        ' Create new PDF document
        Dim pdfDocument = New Document()
        pdfDocument.RegistrationName = "demo"
        pdfDocument.RegistrationKey = "demo"

        ' If you wish to load an existing document uncomment the line below And comment the Add page section instead
        ' pdfDocument.Load(".\existing_document.pdf")

        ' Load image from file to System.Drawing.Image object (we need it to get the image resolution)
        Dim sysImage As System.Drawing.Image = System.Drawing.Image.FromFile(".\scanned-invoice.png")
        ' Compute image size in PDF units (Points)
        Dim widthInPoints As Single = sysImage.Width / sysImage.HorizontalResolution * 72.0F
        Dim heightInPoints As Single = sysImage.Height / sysImage.VerticalResolution * 72.0F

        ' Create page of computed size
        Dim page = New Page(widthInPoints, heightInPoints)
        ' Add page to the document
        pdfDocument.Pages.Add(page)

        Dim canvas = page.Canvas

        ' Create Bytescout.PDF.Image object from loaded image
        Dim pdfImage = New Image(sysImage)
        ' Draw the image
        canvas.DrawImage(pdfImage, 0, 0, widthInPoints, heightInPoints)

        ' Dispose the System.Drawing.Image object to free resources
        sysImage.Dispose()

        ' Create brush
        Dim transparentBrush As SolidBrush = New SolidBrush(New ColorGray(0))
        ' ... and make it transparent
        transparentBrush.Opacity = 0

        ' Draw text with transparent brush
        Dim font16 As Font = New Font(StandardFonts.Helvetica, 16)
        canvas.DrawString("Your Company Name", font16, transparentBrush, 40, 40)

        ' Draw another text
        Dim font10 As Font = New Font(StandardFonts.Helvetica, 10)
        canvas.DrawString("Your Address", font10, transparentBrush, 40, 80)


        ' Save document to file
        pdfDocument.Save("result.pdf")

        ' Cleanup 
		pdfDocument.Dispose()

        ' Open document in default PDF viewer app
        Process.Start("result.pdf")

    End Sub

End Class

Resources.Designer.vb
��'------------------------------------------------------------------------------

' <auto-generated>

'     This code was generated by a tool.

'     Runtime Version:4.0.30319.42000

'

'     Changes to this file may cause incorrect behavior and will be lost if

'     the code is regenerated.

' </auto-generated>

'------------------------------------------------------------------------------



Option Strict On

Option Explicit On





Namespace My.Resources

    

    'This class was auto-generated by the StronglyTypedResourceBuilder

    'class via a tool like ResGen or Visual Studio.

    'To add or remove a member, edit your .ResX file then rerun ResGen

    'with the /str option, or rebuild your VS project.

    '''<summary>

    '''  A strongly-typed resource class, for looking up localized strings, etc.

    '''</summary>

    <Global.System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0"), _

     Global.System.Diagnostics.DebuggerNonUserCodeAttribute(), _

     Global.System.Runtime.CompilerServices.CompilerGeneratedAttribute(), _

     Global.Microsoft.VisualBasic.HideModuleNameAttribute()> _

    Friend Module Resources



        Private resourceMan As Global.System.Resources.ResourceManager



        Private resourceCulture As Global.System.Globalization.CultureInfo



        '''<summary>

        '''  Returns the cached ResourceManager instance used by this class.

        '''</summary>

        <Global.System.ComponentModel.EditorBrowsableAttribute(Global.System.ComponentModel.EditorBrowsableState.Advanced)> _

        Friend ReadOnly Property ResourceManager() As Global.System.Resources.ResourceManager

            Get

                If Object.ReferenceEquals(resourceMan, Nothing) Then

                    Dim temp As Global.System.Resources.ResourceManager = New Global.System.Resources.ResourceManager("InvisibleTextOverImage.Resources", GetType(Resources).Assembly)

                    resourceMan = temp

                End If

                Return resourceMan

            End Get

        End Property



        '''<summary>

        '''  Overrides the current thread's CurrentUICulture property for all

        '''  resource lookups using this strongly typed resource class.

        '''</summary>

        <Global.System.ComponentModel.EditorBrowsableAttribute(Global.System.ComponentModel.EditorBrowsableState.Advanced)> _

        Friend Property Culture() As Global.System.Globalization.CultureInfo

            Get

                Return resourceCulture

            End Get

            Set(ByVal value As Global.System.Globalization.CultureInfo)

                resourceCulture = value

            End Set

        End Property

    End Module

End Namespace


Settings.Designer.vb
��'------------------------------------------------------------------------------

' <auto-generated>

'     This code was generated by a tool.

'     Runtime Version:4.0.30319.42000

'

'     Changes to this file may cause incorrect behavior and will be lost if

'     the code is regenerated.

' </auto-generated>

'------------------------------------------------------------------------------



Option Strict On

Option Explicit On





Namespace My



    <Global.System.Runtime.CompilerServices.CompilerGeneratedAttribute(), _

     Global.System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "11.0.0.0"), _

     Global.System.ComponentModel.EditorBrowsableAttribute(Global.System.ComponentModel.EditorBrowsableState.Advanced)> _

    Partial Friend NotInheritable Class MySettings

        Inherits Global.System.Configuration.ApplicationSettingsBase



        Private Shared defaultInstance As MySettings = CType(Global.System.Configuration.ApplicationSettingsBase.Synchronized(New MySettings), MySettings)



#Region "My.Settings Auto-Save Functionality"

#If _MyType = "WindowsForms" Then

        Private Shared addedHandler As Boolean



        Private Shared addedHandlerLockObject As New Object



        <Global.System.Diagnostics.DebuggerNonUserCodeAttribute(), Global.System.ComponentModel.EditorBrowsableAttribute(Global.System.ComponentModel.EditorBrowsableState.Advanced)> _

        Private Shared Sub AutoSaveSettings(ByVal sender As Global.System.Object, ByVal e As Global.System.EventArgs)

            If My.Application.SaveMySettingsOnExit Then

                My.Settings.Save()

            End If

        End Sub

#End If

#End Region



        Public Shared ReadOnly Property [Default]() As MySettings

            Get



#If _MyType = "WindowsForms" Then

                   If Not addedHandler Then

                        SyncLock addedHandlerLockObject

                            If Not addedHandler Then

                                AddHandler My.Application.Shutdown, AddressOf AutoSaveSettings

                                addedHandler = True

                            End If

                        End SyncLock

                    End If

#End If

                Return defaultInstance

            End Get

        End Property

    End Class

End Namespace



Namespace My

    

    <Global.Microsoft.VisualBasic.HideModuleNameAttribute(),  _

     Global.System.Diagnostics.DebuggerNonUserCodeAttribute(),  _

     Global.System.Runtime.CompilerServices.CompilerGeneratedAttribute()>  _

    Friend Module MySettingsProperty

        

        <Global.System.ComponentModel.Design.HelpKeywordAttribute("My.Settings")>  _

        Friend ReadOnly Property Settings() As Global.InvisibleTextOverImage.My.MySettings

            Get

                Return Global.InvisibleTextOverImage.My.MySettings.Default

            End Get

        End Property

    End Module

End Namespace


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