WPF with VB.NET for show video from webcam and image capturing


XAML for UI Name Windows1.xaml

<Window x:Class="Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF VB WebCam" Height="400" Width="600" Loaded="Window_Loaded" Name="mainWindow">
    <!-- Design by Pongsakorn Poosankam -->
    <Window.Background>
        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFD7F4E8" Offset="0.916"/>
            <GradientStop Color="#FF6CB595" Offset="0.145"/>
        </LinearGradientBrush>
    </Window.Background>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="0.11*"/>
            <RowDefinition Height="0.442*"/>
            <RowDefinition Height="0.067*"/>
            <RowDefinition Height="0.088*"/>
            <RowDefinition Height="0.293*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="0.068*"/>
            <ColumnDefinition Width="0.274*"/>
            <ColumnDefinition Width="0.069*"/>
            <ColumnDefinition Width="0.274*"/>
            <ColumnDefinition Width="0.315*"/>
        </Grid.ColumnDefinitions>
        <Border  Grid.Column="1" Grid.Row="1" BorderThickness="3" CornerRadius="3">
            <Border.BorderBrush>
                <RadialGradientBrush>
                    <GradientStop Color="Black" Offset="0.047"/>
                    <GradientStop Color="#FF00907A" Offset="1"/>
                </RadialGradientBrush>
            </Border.BorderBrush>
            <Image x:Name="imgVideo" Stretch="Fill"   />
        </Border>
        <Border  Grid.Column="3" Grid.Row="1" BorderThickness="3" CornerRadius="3">
            <Border.BorderBrush>
                <RadialGradientBrush>
                    <GradientStop Color="Black" Offset="0.047"/>
                    <GradientStop Color="#FF00907A" Offset="1"/>
                </RadialGradientBrush>
            </Border.BorderBrush>
            <Image x:Name="imgCapture" Stretch="Fill"/>
        </Border>
        <StackPanel Grid.Column="3" Grid.Row="3" Orientation="Horizontal">
            <Button x:Name="bntCapture" Content="Capture Image" Click="bntCapture_Click" />
            <Button x:Name="bntSaveImage" Content="Save Image" Margin="8,0,0,0" Click="bntSaveImage_Click" />
        </StackPanel>
        <StackPanel Grid.Column="4" Grid.Row="1" VerticalAlignment="Center">
            <Button x:Name="bntResolution" Content="Video Format" Width="120" Click="bntResolution_Click" />
            <Button x:Name="bntSetting" Content="Video Source" Width="120" Margin="0,10,0,0" Click="bntSetting_Click" />
        </StackPanel>
        <StackPanel Grid.Column="1" Grid.Row="3" Orientation="Horizontal" HorizontalAlignment="Center">
            <Button x:Name="bntStart" Content="Start" Click="bntStart_Click" />
            <Button x:Name="bntStop" Content="Stop" Margin="10,0,0,0" Click="bntStop_Click" />
            <Button x:Name="bntContinue" Content="Continue" Margin="10,0,0,0" Click="bntContinue_Click" />
        </StackPanel>
    </Grid>
</Window>

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Be hide the Code Windows1.xaml.cs

'Design by Pongsakorn Poosankam
Class Window1
    Private webcam As WebCam
    Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        webcam = New WebCam()
        webcam.InitializeWebCam(imgVideo)
    End Sub

    Private Sub bntStart_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        webcam.Start()
    End Sub

    Private Sub bntStop_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        webcam.Stop()
    End Sub

    Private Sub bntContinue_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        webcam.Continue()
    End Sub

    Private Sub bntCapture_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        imgCapture.Source = imgVideo.Source
    End Sub

    Private Sub bntSaveImage_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        Helper.SaveImageCapture(DirectCast(imgCapture.Source, BitmapSource))
    End Sub

    Private Sub bntResolution_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        webcam.ResolutionSetting()
    End Sub

    Private Sub bntSetting_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        webcam.AdvanceSetting()
    End Sub


End Class

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Class for Control Web cam WebCam.vb

This class is main webcam controller for real time capturing. Developer can change frame rate at here.

Imports System
Imports System.IO
Imports System.Linq
Imports System.Text
Imports WebCam_Capture
Imports System.Windows.Controls
Imports System.Collections.Generic
Imports System.Windows.Media.Imaging

    'Design by Pongsakorn Poosankam
    Class WebCam
        Private webcam As WebCamCapture
        Private _FrameImage As System.Windows.Controls.Image
        Private FrameNumber As Integer = 30
        Public Sub InitializeWebCam(ByRef ImageControl As System.Windows.Controls.Image)
            webcam = New WebCamCapture()
            webcam.FrameNumber = CULng((0))
            webcam.TimeToCapture_milliseconds = FrameNumber
            AddHandler webcam.ImageCaptured, AddressOf webcam_ImageCaptured
            _FrameImage = ImageControl
        End Sub

        Private Sub webcam_ImageCaptured(ByVal source As Object, ByVal e As WebcamEventArgs)
            _FrameImage.Source = Helper.LoadBitmap(DirectCast(e.WebCamImage, System.Drawing.Bitmap))
        End Sub

        Public Sub Start()
            webcam.TimeToCapture_milliseconds = FrameNumber
            webcam.Start(0)
        End Sub

        Public Sub [Stop]()
            webcam.[Stop]()
        End Sub

        Public Sub [Continue]()
            ' change the capture time frame
            webcam.TimeToCapture_milliseconds = FrameNumber

            ' resume the video capture from the stop
            webcam.Start(Me.webcam.FrameNumber)
        End Sub

        Public Sub ResolutionSetting()
            webcam.Config()
        End Sub

        Public Sub AdvanceSetting()
            webcam.Config2()
        End Sub

    End Class


----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Helper class Helper.vb

This class use for convert Bitmap Image from webcam to BitmapSource Object.

Imports System
Imports System.IO
Imports System.Linq
Imports System.Text
Imports System.Collections.Generic
Imports System.Windows.Media.Imaging

'Design by Pongsakorn Poosankam
Class Helper
    'Block Memory Leak
    <System.Runtime.InteropServices.DllImport("gdi32.dll")> _
    Public Shared Function DeleteObject(ByVal handle As IntPtr) As Boolean
    End Function
    Public Shared bs As BitmapSource
    Public Shared ip As IntPtr
    Public Shared Function LoadBitmap(ByVal source As System.Drawing.Bitmap) As BitmapSource

        ip = source.GetHbitmap()


        bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ip, IntPtr.Zero, System.Windows.Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions())

        DeleteObject(ip)

        Return bs

    End Function
    Public Shared Sub SaveImageCapture(ByVal bitmap As BitmapSource)
        Dim encoder As New JpegBitmapEncoder()
        encoder.Frames.Add(BitmapFrame.Create(bitmap))
        encoder.QualityLevel = 100


        ' Configure save file dialog box
        Dim dlg As New Microsoft.Win32.SaveFileDialog()
        dlg.FileName = "Image"
        ' Default file name
        dlg.DefaultExt = ".Jpg"
        ' Default file extension
        dlg.Filter = "Image (.jpg)|*.jpg"
        ' Filter files by extension
        ' Show save file dialog box
        Dim result As Nullable(Of Boolean) = dlg.ShowDialog()

        ' Process save file dialog box results
        If result = True Then
            ' Save Image
            Dim filename As String = dlg.FileName
            Dim fstream As New FileStream(filename, FileMode.Create)
            encoder.Save(fstream)
            fstream.Close()
        End If

    End Sub
End Class


If you found any problem please report to me by comment at below (login with gmail account before comment).
Thank you for try.


Č
ċ
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v.1
DLLforAddReference.zip
(36k)
Pongsakorn Poosankam,
Dec 11, 2009 8:55 AM
ċ
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v.1
WPFVBWebCam.zip
(20k)
Pongsakorn Poosankam,
Dec 11, 2009 8:55 AM

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