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WPF UI Barcode Reading Example - VB.NET

BarCode Reader SDK sample in VB.NET demonstrating ‘WPF UI Barcode Reading Example’

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Application.xaml.vb

Class Application

    ' Application-level events, such as Startup, Exit, and DispatcherUnhandledException
    ' can be handled in this file.

End Class

MainWindow.xaml.vb

Imports System.Text
Imports Bytescout.BarCodeReader

Class MainWindow

    ' Select image file
    Private Sub btnBrowse_Click(sender As Object, e As System.Windows.RoutedEventArgs) Handles btnBrowse.Click

        Dim dlg = New Microsoft.Win32.OpenFileDialog
        dlg.Filter = "Supported formats (*.bmp;*.gif;*.tif;*.png;*.jpg;*.pdf)|*.bmp;*.gif;*.tif;*.tiff;*.png;*.jpg;*.jpeg;*.pdf|All Files|*.*"

        If dlg.ShowDialog() = True Then

            tbFileName.Text = dlg.FileName
            tbFoundBarcodes.Text = ""
            imageContainer.Source = Nothing

            Try
                Dim bitmapImage = New BitmapImage()
                bitmapImage.BeginInit()
                bitmapImage.UriSource = New Uri(dlg.FileName, UriKind.Absolute)
                bitmapImage.EndInit()

                imageContainer.Source = bitmapImage

            Catch ex As Exception
            End Try

        End If
    End Sub

    Private Sub btnDecode_Click(sender As Object, e As System.Windows.RoutedEventArgs) Handles btnDecode.Click

        ' Create barcode reader instance
        Dim reader = New Reader()
        reader.RegistrationName = "demo"
        reader.RegistrationKey = "demo"

        ' Specify barcode types to find
        reader.BarcodeTypesToFind.All = True
        ' Select specific barcode types to speed up the decoding process and avoid false positives.

        ' Show wait cursor
        Mouse.OverrideCursor = Cursors.Wait

        ' -----------------------------------------------------------------------
        ' NOTE: We can read barcodes from specific page to increase performance .
        ' For sample please refer to "Decoding barcodes from PDF by pages" program.
        ' ----------------------------------------------------------------------- 

        Try
            '  Search for barcodes
            reader.ReadFrom(tbFileName.Text)
        Finally
            Mouse.OverrideCursor = Nothing
        End Try

        ' Display found barcode inforamtion:

        Dim stringBuilder = New StringBuilder()

        For i As Integer = 0 To reader.FoundBarcodes.Length - 1
            Dim barcode = reader.FoundBarcodes(i)
            stringBuilder.AppendFormat("{0}) Type: {1}; Value: {2}.\r\n", i + 1, barcode.Type, barcode.Value)
        Next

        tbFoundBarcodes.Text = stringBuilder.ToString()

    End Sub

End Class

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Resources.Designer.vb

��'------------------------------------------------------------------------------

' <auto-generated>

'     This code was generated by a tool.

'     Runtime Version:$clrversion$

'

'     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("$safeprojectname$.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

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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", "10.0.0.0"), _

     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.ReadBarcodeFromImage.My.MySettings

            Get

                Return Global.ReadBarcodeFromImage.My.MySettings.Default

            End Get

        End Property

    End Module

End Namespace

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MyWpfExtension.vb

#If _MyType <> "Empty" Then

Namespace My
    ''' <summary>
    ''' Module used to define the properties that are available in the My Namespace for WPF
    ''' </summary>
    ''' <remarks></remarks>
    <Global.Microsoft.VisualBasic.HideModuleName()> _
    Module MyWpfExtension
        Private s_Computer As New ThreadSafeObjectProvider(Of Global.Microsoft.VisualBasic.Devices.Computer)
        Private s_User As New ThreadSafeObjectProvider(Of Global.Microsoft.VisualBasic.ApplicationServices.User)
        Private s_Windows As New ThreadSafeObjectProvider(Of MyWindows)
        Private s_Log As New ThreadSafeObjectProvider(Of Global.Microsoft.VisualBasic.Logging.Log)
        ''' <summary>
        ''' Returns the application object for the running application
        ''' </summary>
        <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")>  _
        Friend ReadOnly Property Application() As Application
            Get
                Return CType(Global.System.Windows.Application.Current, Application)
            End Get
        End Property
        ''' <summary>
        ''' Returns information about the host computer.
        ''' </summary>
        <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")>  _
        Friend ReadOnly Property Computer() As Global.Microsoft.VisualBasic.Devices.Computer
            Get
                Return s_Computer.GetInstance()
            End Get
        End Property
        ''' <summary>
        ''' Returns information for the current user.  If you wish to run the application with the current 
        ''' Windows user credentials, call My.User.InitializeWithWindowsUser().
        ''' </summary>
        <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")>  _
        Friend ReadOnly Property User() As Global.Microsoft.VisualBasic.ApplicationServices.User
            Get
                Return s_User.GetInstance()
            End Get
        End Property
        ''' <summary>
        ''' Returns the application log. The listeners can be configured by the application's configuration file.
        ''' </summary>
        <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")>  _
        Friend ReadOnly Property Log() As Global.Microsoft.VisualBasic.Logging.Log
            Get
                Return s_Log.GetInstance()
            End Get
        End Property

        ''' <summary>
        ''' Returns the collection of Windows defined in the project.
        ''' </summary>
        <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")>  _
        Friend ReadOnly Property Windows() As MyWindows
            <Global.System.Diagnostics.DebuggerHidden()> _
            Get
                Return s_Windows.GetInstance()
            End Get
        End Property
        <Global.System.ComponentModel.EditorBrowsableAttribute(Global.System.ComponentModel.EditorBrowsableState.Never)> _
        <Global.Microsoft.VisualBasic.MyGroupCollection("System.Windows.Window", "Create__Instance__", "Dispose__Instance__", "My.MyWpfExtenstionModule.Windows")> _
        Friend NotInheritable Class MyWindows
            <Global.System.Diagnostics.DebuggerHidden()> _
            Private Shared Function Create__Instance__(Of T As {New, Global.System.Windows.Window})(ByVal Instance As T) As T
                If Instance Is Nothing Then
                    If s_WindowBeingCreated IsNot Nothing Then
                        If s_WindowBeingCreated.ContainsKey(GetType(T)) = True Then
                            Throw New Global.System.InvalidOperationException("The window cannot be accessed via My.Windows from the Window constructor.")
                        End If
                    Else
                        s_WindowBeingCreated = New Global.System.Collections.Hashtable()
                    End If
                    s_WindowBeingCreated.Add(GetType(T), Nothing)
                    Return New T()
                    s_WindowBeingCreated.Remove(GetType(T))
                Else
                    Return Instance
                End If
            End Function
            <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1822:MarkMembersAsStatic")>  _
            <Global.System.Diagnostics.DebuggerHidden()> _
            Private Sub Dispose__Instance__(Of T As Global.System.Windows.Window)(ByRef instance As T)
                instance = Nothing
            End Sub
            <Global.System.Diagnostics.DebuggerHidden()> _
            <Global.System.ComponentModel.EditorBrowsableAttribute(Global.System.ComponentModel.EditorBrowsableState.Never)> _
            Public Sub New()
                MyBase.New()
            End Sub
            <Global.System.ThreadStatic()> Private Shared s_WindowBeingCreated As Global.System.Collections.Hashtable
            <Global.System.ComponentModel.EditorBrowsable(Global.System.ComponentModel.EditorBrowsableState.Never)> Public Overrides Function Equals(ByVal o As Object) As Boolean
                Return MyBase.Equals(o)
            End Function
            <Global.System.ComponentModel.EditorBrowsable(Global.System.ComponentModel.EditorBrowsableState.Never)> Public Overrides Function GetHashCode() As Integer
                Return MyBase.GetHashCode
            End Function
            <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1822:MarkMembersAsStatic")>  _
            <Global.System.ComponentModel.EditorBrowsable(Global.System.ComponentModel.EditorBrowsableState.Never)> _
            Friend Overloads Function [GetType]() As Global.System.Type
                Return GetType(MyWindows)
            End Function
            <Global.System.ComponentModel.EditorBrowsable(Global.System.ComponentModel.EditorBrowsableState.Never)> Public Overrides Function ToString() As String
                Return MyBase.ToString
            End Function
        End Class
    End Module
End Namespace
Partial Class Application
    Inherits Global.System.Windows.Application
    <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")> _
    <Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1822:MarkMembersAsStatic")> _
    Friend ReadOnly Property Info() As Global.Microsoft.VisualBasic.ApplicationServices.AssemblyInfo
        <Global.System.Diagnostics.DebuggerHidden()> _
        Get
            Return New Global.Microsoft.VisualBasic.ApplicationServices.AssemblyInfo(Global.System.Reflection.Assembly.GetExecutingAssembly())
        End Get
    End Property
End Class
#End If

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Explore SDK documentations here.

WPF UI Barcode Reading Example - VB.NET

Application.xaml.vb Copy

MainWindow.xaml.vb Copy

Resources.Designer.vb Copy

Settings.Designer.vb Copy

MyWpfExtension.vb Copy

Download Source Code (.zip)

Return to the previous page Explore BarCode Reader SDK

Application.xaml.vb

MainWindow.xaml.vb

Resources.Designer.vb

Settings.Designer.vb

MyWpfExtension.vb