Windows Phone Scanner-Demo

We can use Barcode-sacnning in windows phone devices. for this purpose make a project with the name ScannerDemo and make a class inside the project with the name PhotoCameraLuminanceSource.cs

firstly we need to make a note that we need to import a reference for Silverlight_ZXing_Core.dll, which you can download from net and easly can add to references.

The PhotoCameraLuminanceSource.cs code is given below


using System;
using com.google.zxing;

namespace ScannerDemo
{
    public class PhotoCameraLuminanceSource : LuminanceSource
    {
        public byte[] PreviewBufferY { get; private set; }

        public PhotoCameraLuminanceSource(int width, int height) : base(width, height)
        {      
            PreviewBufferY = new byte[width * height];
        }

        public override sbyte[] Matrix
        {
            get { return (sbyte[])(Array)PreviewBufferY; }
        }

        public override sbyte[] getRow(int y, sbyte[] row)
        {
            if (row == null || row.Length < Width)
            {
                row = new sbyte[Width];
            }

            for (int i = 0; i < Height; i++)
                row[i] = (sbyte)PreviewBufferY[i * Width + y];

            return row;
        }
    }
}

after this we need to make a layout at MainPage.xaml as follows

<phone:PhoneApplicationPage 

    x:Class="ScannerDemo.MainPage"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="800"

    FontFamily="{StaticResource PhoneFontFamilyNormal}"

    FontSize="{StaticResource PhoneFontSizeNormal}"

    Foreground="{StaticResource PhoneForegroundBrush}"

    SupportedOrientations="Portrait" Orientation="Portrait">

    

    <Grid x:Name="LayoutRoot" Background="Transparent">

        <Rectangle x:Name="_previewRect" 

                   Margin="0" 

                   Height="800" 

                   Width="600" 

                   HorizontalAlignment="Center" 

                   VerticalAlignment="Center">

            <Rectangle.Fill>

                <VideoBrush x:Name="_previewVideo">

                    <VideoBrush.RelativeTransform>

                        <CompositeTransform  

                            x:Name="_previewTransform" CenterX=".5" CenterY=".5" />

                    </VideoBrush.RelativeTransform>

                </VideoBrush>

            </Rectangle.Fill>

        </Rectangle>

        <ListBox Margin="10" x:Name="_matchesList" FontSize="30" FontWeight="ExtraBold" />

    </Grid>

</phone:PhoneApplicationPage>

finally the code for MainPage.xaml.cs is as given below

using System;

using System.Windows.Threading;

using System.Windows.Navigation;

using System.Collections.ObjectModel;

using Microsoft.Devices;

using com.google.zxing;

using com.google.zxing.common;

using com.google.zxing.qrcode;

namespace ScannerDemo

{

    public partial class MainPage

    {

        private readonly DispatcherTimer _timer;

        private readonly ObservableCollection<string> _matches;

        private PhotoCameraLuminanceSource _luminance;

        private QRCodeReader _reader;

        private PhotoCamera _photoCamera;

        

        public MainPage()

        {            

            InitializeComponent();

            _matches = new ObservableCollection<string>();

            _matchesList.ItemsSource = _matches;

            _timer = new DispatcherTimer();

            _timer.Interval = TimeSpan.FromMilliseconds(250);

            _timer.Tick += (o, arg) => ScanPreviewBuffer();

        }

        protected override void OnNavigatedTo(NavigationEventArgs e)

        {

            _photoCamera = new PhotoCamera();

            _photoCamera.Initialized += OnPhotoCameraInitialized;            

            _previewVideo.SetSource(_photoCamera);

            CameraButtons.ShutterKeyHalfPressed += (o, arg) => _photoCamera.Focus();

            base.OnNavigatedTo(e);

        }

        private void OnPhotoCameraInitialized(object sender, CameraOperationCompletedEventArgs e)

        {

            int width = Convert.ToInt32(_photoCamera.PreviewResolution.Width);

            int height = Convert.ToInt32(_photoCamera.PreviewResolution.Height);

            

            _luminance = new PhotoCameraLuminanceSource(width, height);

            _reader = new QRCodeReader();

            Dispatcher.BeginInvoke(() => {

                _previewTransform.Rotation = _photoCamera.Orientation;

                _timer.Start();

            });

        }

 

        private void ScanPreviewBuffer()

        {

            try

            {

                _photoCamera.GetPreviewBufferY(_luminance.PreviewBufferY);

                var binarizer = new HybridBinarizer(_luminance);

                var binBitmap = new BinaryBitmap(binarizer);

                var result = _reader.decode(binBitmap);

                Dispatcher.BeginInvoke(() => DisplayResult(result.Text));

            }

            catch

            {

            }            

        }

        private void DisplayResult(string text)

        {

            if(!_matches.Contains(text))

                _matches.Add(text);            

        }

    }

}

enjoy the barcode simple scanner solution and have a great day with windows phone development.