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所以抽时间实现了wp8.1实现二维码扫描的功能
1. 在项目中添加对Zxing的引用
Zxing示例代码下载地址:http://zxingnet.codeplex.com/
2.添加页面代码
<Grid x:Name="LayoutRoot" Background="Black"> <Grid Background="Black"> <Grid.ColumnDefinitions> <ColumnDefinition Width="50"/> <ColumnDefinition Width="300"/> <ColumnDefinition Width="50"/> </Grid.ColumnDefinitions> <Grid Grid.Column="0" Height="366" Margin="0,0,0,0"> </Grid> <!--取景器区域--> <Grid Grid.Column="1" x:Name="ScanViewGrid" Margin="0,0,0,0"> <Grid.Resources> <Storyboard x:Name="myStoryboard"> <DoubleAnimation Storyboard.TargetName="imgScan" Storyboard.TargetProperty="(Canvas.Top)" Duration="0:0:2.5" From="0" To="300" RepeatBehavior="Forever"/> </Storyboard> </Grid.Resources> <!--扫描线--> <Canvas Width="300" Canvas.Top="170" Height="300"> <CaptureElement Stretch="UniformToFill" x:Name="VideoCapture" Width="300" Height="300" > </CaptureElement> <Image x:Name="imgScan" Source="/Assets/img/light.png" Width="300" Height="40" Stretch="Fill"/> <Image x:Name="CaptureImage" Width="300" Height="300" Visibility="Collapsed" /> </Canvas> </Grid> <Grid Grid.Column="2" Margin="0,0,0,0"/> </Grid> <TextBlock x:Name="Error" VerticalAlignment="Bottom" FontSize="32" Width="400" TextAlignment="Center" /> <TextBlock x:Name="ScanResult" Text="hhh" FontSize="25" Foreground="White" VerticalAlignment="Bottom" TextAlignment="Center" Width="400"/> </Grid>
3.功能实现
public sealed partial class QCodeView : Page { private readonly MediaCapture _mediaCapture = new MediaCapture(); private Result _result; private NavigationHelper navigationHelper; private ObservableDictionary defaultViewModel = new ObservableDictionary(); private DispatcherTimer _timer; public QCodeView() { this.InitializeComponent(); //设备屏幕方向 DisplayInformation.AutoRotationPreferences = DisplayOrientations.Portrait; ///隐藏StatusBar var statusBar = StatusBar.GetForCurrentView(); statusBar.HideAsync(); this.navigationHelper = new NavigationHelper(this); this.navigationHelper.LoadState += this.NavigationHelper_LoadState; this.navigationHelper.SaveState += this.NavigationHelper_SaveState; } /// <summary> /// 获取与此 <see cref="Page"/> 关联的 <see cref="NavigationHelper"/>。 /// </summary> public NavigationHelper NavigationHelper { get { return this.navigationHelper; } } /// <summary> /// 获取此 <see cref="Page"/> 的视图模型。 /// 可将其更改为强类型视图模型。 /// </summary> public ObservableDictionary DefaultViewModel { get { return this.defaultViewModel; } } /// <summary> /// 使用在导航过程中传递的内容填充页。 在从以前的会话 /// 重新创建页时，也会提供任何已保存状态。 /// </summary> /// <param name="sender"> /// 事件的来源; 通常为 <see cref="NavigationHelper"/> /// </param> /// <param name="e">事件数据，其中既提供在最初请求此页时传递给 /// <see cref="Frame.Navigate(Type, Object)"/> 的导航参数，又提供 /// 此页在以前会话期间保留的状态的 /// 字典。 首次访问页面时，该状态将为 null。</param> private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e) { } /// <summary> /// 保留与此页关联的状态，以防挂起应用程序或 /// 从导航缓存中放弃此页。值必须符合 /// <see cref="SuspensionManager.SessionState"/> 的序列化要求。 /// </summary> /// <param name="sender">事件的来源；通常为 <see cref="NavigationHelper"/></param> ///<param name="e">提供要使用可序列化状态填充的空字典 ///的事件数据。</param> private void NavigationHelper_SaveState(object sender, SaveStateEventArgs e) { } #region NavigationHelper 注册 /// <summary> /// 此部分中提供的方法只是用于使 /// NavigationHelper 可响应页面的导航方法。 /// <para> /// 应将页面特有的逻辑放入用于 /// <see cref="NavigationHelper.LoadState"/> /// 和 <see cref="NavigationHelper.SaveState"/> 的事件处理程序中。 /// 除了在会话期间保留的页面状态之外 /// LoadState 方法中还提供导航参数。 /// </para> /// </summary> /// <param name="e">提供导航方法数据和 /// 无法取消导航请求的事件处理程序。</param> protected override void OnNavigatedTo(NavigationEventArgs e) { myStoryboard.Begin(); InitVideoCapture(); InitVideoTimer(); this.navigationHelper.OnNavigatedTo(e); } /// <summary> /// 初始化摄像 /// </summary> private async void InitVideoCapture() { ///摄像头的检测 var cameras = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture); if (cameras.Count < 1) { Error.Text = "设备没有摄像头,读取本地资源"; await DecodeStaticResource(); return; } /// 创建 MediaCaptureInitializationSettings 对象的新实例。 var settings = new MediaCaptureInitializationSettings { StreamingCaptureMode = StreamingCaptureMode.AudioAndVideo, MediaCategory = MediaCategory.Other, AudioProcessing = Windows.Media.AudioProcessing.Default, VideoDeviceId = cameras[1].Id }; //if (cameras.Count == 1) //{ // settings = new MediaCaptureInitializationSettings { VideoDeviceId = cameras[0].Id }; // 0 => front, 1 => back //} //else //{ // settings = new MediaCaptureInitializationSettings { VideoDeviceId = cameras[1].Id }; // 0 => front, 1 => back //} await _mediaCapture.InitializeAsync(settings); VideoCapture.Source = _mediaCapture; await _mediaCapture.StartPreviewAsync(); } private void InitVideoTimer() { _timer = new DispatcherTimer(); _timer.Interval = TimeSpan.FromSeconds(6); _timer.Tick += _timer_Tick; _timer.Start(); } private bool IsBusy = false; async void _timer_Tick(object sender, object e) { try { while (_result == null) { if (!IsBusy) { IsBusy = true; ///获取焦点 //var autoFocusSupported = _mediaCapture.VideoDeviceController.FocusControl.SupportedFocusModes.Contains(FocusMode.Auto); //if (autoFocusSupported) //{ // var focusSettings = new FocusSettings // { // Mode = FocusMode.Auto, // AutoFocusRange = AutoFocusRange.Normal // }; // _mediaCapture.VideoDeviceController.FocusControl.Configure(focusSettings); // //await _mediaCapture.VideoDeviceController.FocusControl.FocusAsync().AsTask(_cancellationTokenSource.Token); //} var photoStorageFile = await KnownFolders.PicturesLibrary.CreateFileAsync("qcode.jpg", CreationCollisionOption.ReplaceExisting); await _mediaCapture.CapturePhotoToStorageFileAsync(ImageEncodingProperties.CreateJpeg(), photoStorageFile); var stream = await photoStorageFile.OpenReadAsync(); // initialize with 1,1 to get the current size of the image var writeableBmp = new WriteableBitmap(1, 1); writeableBmp.SetSource(stream); // and create it again because otherwise the WB isn't fully initialized and decoding // results in a IndexOutOfRange writeableBmp = new WriteableBitmap(writeableBmp.PixelWidth, writeableBmp.PixelHeight); stream.Seek(0); writeableBmp.SetSource(stream); _result = ScanBitmap(writeableBmp); await photoStorageFile.DeleteAsync(StorageDeleteOption.PermanentDelete); } if (_result != null) { await _mediaCapture.StopPreviewAsync(); VideoCapture.Visibility = Visibility.Collapsed; CaptureImage.Visibility = Visibility.Visible; ScanResult.Text = _result.Text; _timer.Stop(); myStoryboard.Stop(); imgScan.Visibility = Visibility.Collapsed; } IsBusy = false; } } catch (Exception ex) { IsBusy = false; //Error.Text = ex.Message; } } /// <summary> /// 读取本地资源 /// </summary> /// <returns></returns> private async System.Threading.Tasks.Task DecodeStaticResource() { var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(@"Assets\1.png"); var stream = await file.OpenReadAsync(); // initialize with 1,1 to get the current size of the image var writeableBmp = new WriteableBitmap(1, 1); writeableBmp.SetSource(stream); // and create it again because otherwise the WB isn't fully initialized and decoding // results in a IndexOutOfRange writeableBmp = new WriteableBitmap(writeableBmp.PixelWidth, writeableBmp.PixelHeight); stream.Seek(0); writeableBmp.SetSource(stream); CaptureImage.Source = writeableBmp; VideoCapture.Visibility = Visibility.Collapsed; CaptureImage.Visibility = Visibility.Visible; _result = ScanBitmap(writeableBmp); if (_result != null) { ScanResult.Text += _result.Text; } return; } /// <summary> /// 解析二维码图片 /// </summary> /// <param name="writeableBmp">拍摄的图片</param> /// <returns></returns> private Result ScanBitmap(WriteableBitmap writeableBmp) { var barcodeReader = new BarcodeReader { TryHarder = true, AutoRotate = true }; var result = barcodeReader.Decode(writeableBmp); if (result != null) { CaptureImage.Source = writeableBmp; } return result; } /// <summary> /// 页面离开时对_mediaCapture对象进行释放 /// 防止内存溢出及资源占用 /// </summary> /// <param name="e"></param> protected override async void OnNavigatedFrom(NavigationEventArgs e) { try { await _mediaCapture.StopPreviewAsync(); await _mediaCapture.StopRecordAsync(); _mediaCapture.Dispose(); } catch (Exception) { } this.navigationHelper.OnNavigatedFrom(e); } #endregion }
源码下载地址:http://vdisk.weibo.com/s/ztJnMX2jYqaK3
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