First implementation of a barcode reader for windows store apps

BarcodeScanner/MvvmCross.Plugins.BarcodeScanner.WindowsCommon/MvvmCross.Plugins.BarcodeScanner.WindowsCommon.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <MinimumVisualStudioVersion>12.0</MinimumVisualStudioVersion>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{AAA4065C-46B6-4403-A84A-6D8ACF1534DE}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>MvvmCross.Plugins.Accelerometer.WindowsCommon</RootNamespace>
+    <AssemblyName>MvvmCross.Plugins.Accelerometer.WindowsCommon</AssemblyName>
+    <DefaultLanguage>en-US</DefaultLanguage>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TargetFrameworkProfile>Profile32</TargetFrameworkProfile>
+    <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>..\..\bin\Debug\Mvx\WindowsCommon\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>..\..\bin\Release\Mvx\WindowsCommon\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <ItemGroup>
+    <TargetPlatform Include="WindowsPhoneApp, Version=8.1" />
+    <TargetPlatform Include="Windows, Version=8.1" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="MvxWindowsCommonBarcodeScanner.cs" />
+    <Compile Include="Plugin.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="MvvmCross.Binding, Version=4.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\MvvmCross.Binding.4.1.6\lib\portable-win81+wpa81\MvvmCross.Binding.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="MvvmCross.Core, Version=4.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\MvvmCross.Core.4.1.6\lib\portable-win81+wpa81\MvvmCross.Core.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="MvvmCross.Localization, Version=4.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\MvvmCross.Binding.4.1.6\lib\portable-win81+wpa81\MvvmCross.Localization.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="MvvmCross.Platform, Version=4.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\MvvmCross.Platform.4.1.6\lib\portable-win81+wpa81\MvvmCross.Platform.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="MvvmCross.Platform.WindowsCommon, Version=4.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\MvvmCross.Platform.4.1.6\lib\portable-win81+wpa81\MvvmCross.Platform.WindowsCommon.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="MvvmCross.WindowsCommon, Version=4.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\MvvmCross.Core.4.1.6\lib\portable-win81+wpa81\MvvmCross.WindowsCommon.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\MvvmCross.Plugins.BarcodeScanner\MvvmCross.Plugins.BarcodeScanner.csproj">
+      <Project>{0e10e61c-78b8-437a-b044-6d1886f82ed9}</Project>
+      <Name>MvvmCross.Plugins.BarcodeScanner</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

BarcodeScanner/MvvmCross.Plugins.BarcodeScanner.WindowsCommon/MvxWindowsCommonBarcodeScanner.cs

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+// <copyright file="MvxStoreAccelerometer.cs" company="Cirrious">
+// (c) Copyright Cirrious. http://www.cirrious.com
+// This source is subject to the Microsoft Public License (Ms-PL)
+// Please see license.txt on http://opensource.org/licenses/ms-pl.html
+// All other rights reserved.
+// </copyright>
+//
+// Project Lead - Stuart Lodge, Cirrious. http://www.cirrious.com - Hire me - I'm worth it!
+
+using System;
+using MvvmCross.Platform.Core;
+using MvvmCross.Platform.Exceptions;
+using Windows.Devices.Sensors;
+//using Windows.Devices.PointOfService = POS;
+
+
+namespace MvvmCross.Plugins.BarcodeScanner.WindowsStore {
+    public class MvxBarcodeScanner : IMvxBarcodeScanner {
+
+        private MvxBarcodeScannerReading _lastReading;
+
+        private bool _started;
+        private Windows.Devices.PointOfService.BarcodeScanner _barcodeScanner;
+        private Windows.Devices.PointOfService.ClaimedBarcodeScanner _claimedBarcodeScanner;
+
+        public async void Start() {
+            if (_started) {
+                throw new MvxException("Barcodescanner already started");
+            }
+
+            if (await CreateScanner()) {
+                Log.Trace("BarcodeScanner Registration Successfull");
+                if (await ClaimScanner()) {
+                    Log.Trace("BarcodeScanner Claimed Successfull");
+                    _started = true;
+                    // Make sure the scanner remains claimed for our app
+                    _claimedBarcodeScanner.ReleaseDeviceRequested += _claimedBarcodeScanner_ReleaseDeviceRequested;
+                    _claimedBarcodeScanner.DataReceived += _claimedBarcodeScanner_DataReceived;
+                    _claimedBarcodeScanner.IsDecodeDataEnabled = true;
+                    if (await EnableScanner()) {
+                        Log.Trace("Barcode Scanner ready to Scan");
+                    }
+                }
+            }
+        }
+
+        private void _claimedBarcodeScanner_DataReceived(Windows.Devices.PointOfService.ClaimedBarcodeScanner sender, Windows.Devices.PointOfService.BarcodeScannerDataReceivedEventArgs args) {
+            var rawdata = Windows.Storage.Streams.DataReader.FromBuffer(args.Report.ScanData);
+            var barcodedata = Windows.Storage.Streams.DataReader.FromBuffer(args.Report.ScanDataLabel);
+
+            // Remove the checksum
+            string strippedbc = barcodedata.ReadString(args.Report.ScanDataLabel.Length);
+            strippedbc = strippedbc.Remove(strippedbc.Length - 2);
+            // Trim the end
+            strippedbc = strippedbc.TrimEnd();
+
+            OnBarcodeScanned(args.Report.ScanDataType, rawdata.ReadString(args.Report.ScanData.Length), strippedbc);
+        }
+
+
+        protected virtual void OnBarcodeScanned(uint scanDataType, string rawData, string barcode) {
+            Log.MethodEnter();
+            Log.Debug($"scanDataType {scanDataType}");
+            Log.Debug($"rawData {rawData}");
+            Log.Debug($"barcode {barcode}");
+            ReadingAvailable?.Invoke(this, new MvxValueEventArgs<MvxBarcodeScannerReading>(new MvxBarcodeScannerReading(scanDataType, rawData, barcode)));
+            Log.MethodExit();
+        }
+
+        private void _claimedBarcodeScanner_ReleaseDeviceRequested(object sender, Windows.Devices.PointOfService.ClaimedBarcodeScanner e) {
+            e.RetainDevice();
+            Log.Trace("Event ReleaseDeviceRequest received. Retaining the Barcode Scanner.");
+
+        }
+
+        public void Stop() {
+            _started = false;
+            ReleaseScanner();
+        }
+
+        public MvxBarcodeScannerReading LastReading
+        {
+            get { return _lastReading; }
+        }
+
+        public event EventHandler<MvxValueEventArgs<MvxBarcodeScannerReading>> ReadingAvailable;
+
+        /// <summary>
+        /// Create a barcodescanner object
+        /// </summary>
+        /// <returns>true if system has a barcodescanner</returns>
+        public async Task<bool> CreateScanner() {
+            _barcodeScanner = await Windows.Devices.PointOfService.BarcodeScanner.GetDefaultAsync();
+
+            if (_barcodeScanner == null) {
+                DeviceInformationCollection col = await DeviceInformation.FindAllAsync(Windows.Devices.PointOfService.BarcodeScanner.GetDeviceSelector());
+                if (col.Count > 0) {
+                    _barcodeScanner = await Windows.Devices.PointOfService.BarcodeScanner.FromIdAsync(col[0].Id);
+                }
+            }
+
+            return _barcodeScanner != null;
+        }
+        /// <summary>
+        /// Claim the barcode scanner
+        /// </summary>
+        /// <returns>true if claimed</returns>
+        private async Task<bool> ClaimScanner() {
+            if (_claimedBarcodeScanner != null) {
+                Log.Trace("Scanner was allready claimed");
+                return true;
+
+            } else {
+                // claim the barcode scanner
+                _claimedBarcodeScanner = await _barcodeScanner.ClaimScannerAsync();
+                // enable the claimed barcode scanner
+                if (_claimedBarcodeScanner == null) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        private async Task<bool> EnableScanner() {
+            // enable the claimed barcode scanner
+            if (_claimedBarcodeScanner == null) {
+                return false;
+            } else {
+                await _claimedBarcodeScanner.EnableAsync();
+
+                Log.Trace("Enable Barcode Scanner succeeded.");
+
+                return true;
+            }
+
+        }
+
+        public void ReleaseScanner() {
+            if (_claimedBarcodeScanner != null) {
+                // Detach the event handlers
+                _claimedBarcodeScanner.DataReceived -= _claimedBarcodeScanner_DataReceived;
+                _claimedBarcodeScanner.ReleaseDeviceRequested -= _claimedBarcodeScanner_ReleaseDeviceRequested;
+                // Release the Barcode Scanner and set to null
+                _claimedBarcodeScanner.Dispose();
+                _claimedBarcodeScanner = null;
+            }
+            _barcodeScanner = null;
+        }
+    }
+}
+
+namespace MvvmCross.Plugins.Accelerometer.WindowsCommon
+{
+    public class MvxWindowsCommonBarcodeScanner : IMvxAccelerometer
+    {
+        private bool _started;
+        private Windows.Devices.Sensors.Accelerometer _accelerometer;
+
+        public void Start()
+        {
+            if (_started)
+            {
+                throw new MvxException("Accelerometer already started");
+            }
+            _accelerometer = Windows.Devices.Sensors.Accelerometer.GetDefault();
+            if (_accelerometer != null)
+            {
+                _accelerometer.ReadingChanged += AccelerometerOnReadingChanged;
+            }
+            _started = true;
+        }
+
+        public void Stop()
+        {
+            if (!_started)
+            {
+                throw new MvxException("Accelerometer not started");
+            }
+            if (_accelerometer != null)
+            {
+                _accelerometer.ReadingChanged -= AccelerometerOnReadingChanged;
+                _accelerometer = null;
+            }
+            _started = false;
+        }
+
+        private void AccelerometerOnReadingChanged(Windows.Devices.Sensors.Accelerometer sender, AccelerometerReadingChangedEventArgs args)
+        {
+            var handler = ReadingAvailable;
+
+            if (handler == null)
+                return;
+
+            var reading = ToReading(args.Reading);
+
+            handler(this, new MvxValueEventArgs<MvxAccelerometerReading>(reading));
+        }
+
+        private static MvxAccelerometerReading ToReading(AccelerometerReading sensorReading)
+        {
+            var reading = new MvxAccelerometerReading
+            {
+                X = sensorReading.AccelerationX,
+                Y = sensorReading.AccelerationY,
+                Z = sensorReading.AccelerationZ
+            };
+            return reading;
+        }
+
+        public bool Started => _accelerometer != null;
+
+        public MvxAccelerometerReading LastReading
+        {
+            get
+            {
+                try
+                {
+                    var reading = ToReading(_accelerometer.GetCurrentReading());
+                    return reading;
+                }
+                catch (Exception exception)
+                {
+                    throw exception.MvxWrap("Problem getting current Accelerometer reading");
+                }
+            }
+        }
+
+        public event EventHandler<MvxValueEventArgs<MvxAccelerometerReading>> ReadingAvailable;
+    }
+}

BarcodeScanner/MvvmCross.Plugins.BarcodeScanner.WindowsCommon/Plugin.cs

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+// <copyright file="Plugin.cs" company="Cirrious">
+// (c) Copyright Cirrious. http://www.cirrious.com
+// This source is subject to the Microsoft Public License (Ms-PL)
+// Please see license.txt on http://opensource.org/licenses/ms-pl.html
+// All other rights reserved.
+// </copyright>
+//
+// Project Lead - Stuart Lodge, Cirrious. http://www.cirrious.com - Hire me - I'm worth it!
+
+using MvvmCross.Platform;
+using MvvmCross.Platform.Plugins;
+
+namespace MvvmCross.Plugins.Accelerometer.WindowsCommon
+{
+    public class Plugin
+        : IMvxPlugin
+    {
+        public void Load()
+        {
+            Mvx.RegisterSingleton<IMvxAccelerometer>(new MvxWindowsCommonBarcodeScanner());
+        }
+    }
+}

BarcodeScanner/MvvmCross.Plugins.BarcodeScanner.WindowsCommon/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Resources;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("MvvmCross.Plugins.Accelerometer.WindowsCommon")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("MvvmCross.Plugins.Accelerometer.WindowsCommon")]
+[assembly: AssemblyCopyright("Copyright © 2016")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: NeutralResourcesLanguage("en")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("4.0.0.0")]
+[assembly: AssemblyFileVersion("4.0.0.0")]

BarcodeScanner/MvvmCross.Plugins.BarcodeScanner.WindowsCommon/packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="MvvmCross.Binding" version="4.1.6" targetFramework="portable46-win81+wpa81" />
+  <package id="MvvmCross.Core" version="4.1.6" targetFramework="portable46-win81+wpa81" />
+  <package id="MvvmCross.Platform" version="4.1.6" targetFramework="portable46-win81+wpa81" />
+</packages>