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通过摄像头扫描一维码/二维码(windows系统):相机软解码方案介绍

作者:手持三防加固平板电脑pad手持终端PDA定制专家    来源:www.dxe886.cn    发布时间:2019-08-07 20:52    浏览量:

现在一维码二维码的应用场景越来越多,通过摄像头来软解条码的方式也越来越多,下面研维工程师就为大家介绍一下通过摄像头扫描一维码/二维码(windows系统):相机软解码方案的具体实施步骤,希望对大家有所启迪。

1、首先打开VS2015开发环境,新建UWP工程,右键项目引用,打开Nuget包管理器搜索安装:ZXing.Net.Mobile

2、该工程基于
ZXing框架,应用部署于基于windows10系统的PDA手持设备之中,而非wince,请注意。

3、其中BarcodePage.xmal.cs后台源码如下:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading.Tasks;
using Windows.ApplicationModel;
using Windows.Devices.Enumeration;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Graphics.Display;
using Windows.Graphics.Imaging;
using Windows.Media;
using Windows.Media.Capture;
using Windows.Media.Devices;
using Windows.Media.MediaProperties;
using Windows.Storage;
using Windows.Storage.FileProperties;
using Windows.Storage.Streams;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Imaging;
using Windows.UI.Xaml.Navigation;
using ZXing;
 
// https://go.microsoft.com/fwlink/?LinkId=234238 上介绍了“空白页”项模板
 
namespace SuperTools.Views
{
    /// <summary>
    /// 可用于自身或导航至 Frame 内部的空白页。
    /// </summary>
    public sealed partial class BarcodePage : Page
    {
        private Result _result;
        private MediaCapture _mediaCapture;
        private DispatcherTimer _timer;
        private bool IsBusy;
        private bool _isPreviewing = false;
        private bool _isInitVideo = false;
        BarcodeReader barcodeReader;
 
        private static readonly Guid RotationKey = new Guid("C380465D-2271-428C-9B83-ECEA3B4A85C1");
 
        public BarcodePage()
        {
            barcodeReader = new BarcodeReader
            {
                AutoRotate = true,
                Options = new ZXing.Common.DecodingOptions { TryHarder = true }
            };
            this.InitializeComponent();
            this.NavigationCacheMode = NavigationCacheMode.Required;
            Application.Current.Suspending += Application_Suspending;
            Application.Current.Resuming += Application_Resuming;
        }
 
        private async void Application_Suspending(object sender, SuspendingEventArgs e)
        {
            // Handle global application events only if this page is active
            if (Frame.CurrentSourcePageType == typeof(MainPage))
            {
                var deferral = e.SuspendingOperation.GetDeferral();
 
                await CleanupCameraAsync();
 
                deferral.Complete();
            }
        }
 
        private void Application_Resuming(object sender, object o)
        {
            // Handle global application events only if this page is active
            if (Frame.CurrentSourcePageType == typeof(MainPage))
            {
                InitVideoCapture();
            }
        }
 
        protected override async void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            // Handling of this event is included for completenes, as it will only fire when navigating between pages and this sample only includes one page
            await CleanupCameraAsync();
        }
 
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            InitVideoCapture();
        }
 
        private async Task CleanupCameraAsync()
        {
            if (_isPreviewing)
            {
                await StopPreviewAsync();
            }
            _timer.Stop();
            if (_mediaCapture != null)
            {
                _mediaCapture.Dispose();
                _mediaCapture = null;
            }
        }
 
        private void InitVideoTimer()
        {
            _timer = new DispatcherTimer();
            _timer.Interval = TimeSpan.FromSeconds(1);
            _timer.Tick += _timer_Tick;
            _timer.Start();
        }
 
        private async Task StopPreviewAsync()
        {
            _isPreviewing = false;
            await _mediaCapture.StopPreviewAsync();
 
            // Use the dispatcher because this method is sometimes called from non-UI threads
            await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                VideoCapture.Source = null;
            });
        }
 
        private async void _timer_Tick(object sender, object e)
        {
            try
            {
                if (!IsBusy)
                {
                    IsBusy = true;
 
                    var previewProperties = _mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;
 
                    VideoFrame videoFrame = new VideoFrame(BitmapPixelFormat.Bgra8, (int)previewProperties.Width, (int)previewProperties.Height);
                    VideoFrame previewFrame = await _mediaCapture.GetPreviewFrameAsync(videoFrame);
 
                    WriteableBitmap bitmap = new WriteableBitmap(previewFrame.SoftwareBitmap.PixelWidth, previewFrame.SoftwareBitmap.PixelHeight);
 
                    previewFrame.SoftwareBitmap.CopyToBuffer(bitmap.PixelBuffer);
 
                    await Task.Factory.StartNew(async () => { await ScanBitmap(bitmap); });
                }
                IsBusy = false;
                await Task.Delay(50);
            }
            catch (Exception)
            {
                IsBusy = false;
            }
        }
 
        /// <summary>
        /// 解析二维码图片
        /// </summary>
        /// <param name="writeableBmp">图片</param>
        /// <returns></returns>
        private async Task ScanBitmap(WriteableBitmap writeableBmp)
        {
            try
            {
                await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
                {
                    _result = barcodeReader.Decode(writeableBmp.PixelBuffer.ToArray(), writeableBmp.PixelWidth, writeableBmp.PixelHeight, RGBLuminanceSource.BitmapFormat.Unknown);
                    if (_result != null)
                    {
                        //TODO: 扫描结果:_result.Text
                    }
                });
 
            }
            catch (Exception)
            {
            }
        }
 
        private async void InitVideoCapture()
        {
            ///摄像头的检测  
            var cameraDevice = await FindCameraDeviceByPanelAsync(Windows.Devices.Enumeration.Panel.Back);
 
            if (cameraDevice == null)
            {
                System.Diagnostics.Debug.WriteLine("No camera device found!");
                return;
            }
            var settings = new MediaCaptureInitializationSettings
            {
                StreamingCaptureMode = StreamingCaptureMode.Video,
                MediaCategory = MediaCategory.Other,
                AudioProcessing = AudioProcessing.Default,
                VideoDeviceId = cameraDevice.Id
            };
            _mediaCapture = new MediaCapture();
            await _mediaCapture.InitializeAsync(settings);
 
            VideoCapture.Source = _mediaCapture;
            await _mediaCapture.StartPreviewAsync();
 
            var props = _mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview);
            props.Properties.Add(RotationKey, 90);
 
            await _mediaCapture.SetEncodingPropertiesAsync(MediaStreamType.VideoPreview, props, null);
 
            var focusControl = _mediaCapture.VideoDeviceController.FocusControl;
 
            if (focusControl.Supported)
            {
                await focusControl.UnlockAsync();
                var setting = new FocusSettings { Mode = FocusMode.Continuous, AutoFocusRange = AutoFocusRange.FullRange };
                focusControl.Configure(setting);
                await focusControl.FocusAsync();
            }
 
            _isPreviewing = true;
            _isInitVideo = true;
            InitVideoTimer();
        }
 
        private static async Task<DeviceInformation> FindCameraDeviceByPanelAsync(Windows.Devices.Enumeration.Panel desiredPanel)
        {
            var allVideoDevices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
 
            DeviceInformation desiredDevice = allVideoDevices.FirstOrDefault(x => x.EnclosureLocation != null && x.EnclosureLocation.Panel == desiredPanel);
 
            return desiredDevice ?? allVideoDevices.FirstOrDefault();
        }
    }
}

4、其中BarcodePage.xmal页面的源码如下:

<Page
    x:Class="SuperTools.Views.BarcodePage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:SuperTools.Views"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <Page.Transitions>
        <TransitionCollection>
            <NavigationThemeTransition>
                <SlideNavigationTransitionInfo />
            </NavigationThemeTransition>
        </TransitionCollection>
    </Page.Transitions>
 
    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Grid x:Name="LayoutRoot" >
            <Grid x:Name="ContentPanel" >
                <!--视频流预览-->
                <CaptureElement x:Name="VideoCapture" Stretch="UniformToFill"/>
 
                <Grid Width="300" Height="300" x:Name="ViewGrid">
                    <Rectangle Width="3" Height="50" Fill="Orange" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                    <Rectangle Width="3" Height="50" Fill="Orange" HorizontalAlignment="Right" VerticalAlignment="Top"/>
                    <Rectangle Width="3" Height="50" Fill="Orange" HorizontalAlignment="Left" VerticalAlignment="Bottom"/>
                    <Rectangle Width="3" Height="50" Fill="Orange" HorizontalAlignment="Right" VerticalAlignment="Bottom"/>
                    <Rectangle Width="50" Height="3" Fill="Orange" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                    <Rectangle Width="50" Height="3" Fill="Orange" HorizontalAlignment="Right" VerticalAlignment="Top"/>
                    <Rectangle Width="50" Height="3" Fill="Orange" HorizontalAlignment="Left" VerticalAlignment="Bottom"/>
                    <Rectangle Width="50" Height="3" Fill="Orange" HorizontalAlignment="Right" VerticalAlignment="Bottom"/>
 
                    <Rectangle x:Name="recScanning"  Margin="12,0,12,0" VerticalAlignment="Center" Height="2" Fill="Green" RenderTransformOrigin="0.5,0.5" />
                </Grid>
            </Grid>
        </Grid>
    </Grid>
</Page>

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