我正在使用ZXing.Net库从相机扫描/读取条形码。我使用了以下示例：
https://zxingnet.codeplex.com/SourceControl/latest#trunk/Clients/WindowsRTDemo/MainPage.xaml.cs
但它没有用。它冻结了设备。
如何在Windows Phone 8.1中使用ZXing.Net库？任何例子？
还有其他图书馆吗？
答案 0 :(得分：1)
您需要先添加Zxing.Net库并在前端使用它
<phone:PhoneApplicationPage
x:Class="BarCode.Scan"
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:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
mc:Ignorable="d"
shell:SystemTray.IsVisible="True">
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Canvas x:Name="viewfinderCanvas" Margin="0,0,0,10">
<!--Camera viewfinder -->
<Canvas.Background>
<VideoBrush x:Name="viewfinderBrush">
<VideoBrush.RelativeTransform>
<CompositeTransform
x:Name="viewfinderTransform"
CenterX="0.5"
CenterY="0.5"
Rotation="90"/>
</VideoBrush.RelativeTransform>
</VideoBrush>
</Canvas.Background>
<TextBlock
x:Name="focusBrackets"
Text="[ ]"
FontSize="40" Visibility="Collapsed"/>
<TextBlock Canvas.Left="129" TextWrapping="Wrap" Text="Tap to read the Barcode" Canvas.Top="721" Width="233" FontFamily="Segoe UI"/>
</Canvas>
<!--Used for debugging >-->
<!--<StackPanel Grid.Row="1" Margin="20, 0">
<TextBlock x:Name="tbBarcodeType" FontWeight="ExtraBold" />
<TextBlock x:Name="tbBarcodeData" FontWeight="ExtraBold" TextWrapping="Wrap" />
</StackPanel>-->
</Grid>
在后端使用此
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using Microsoft.Devices;
using ZXing;
using System.Windows.Threading;
using System.Windows.Media.Imaging;
using System.Windows.Input;
namespace BarCode
{
public partial class Scan : PhoneApplicationPage
{
private PhotoCamera _phoneCamera;
private IBarcodeReader _barcodeReader;
private DispatcherTimer _scanTimer;
private WriteableBitmap _previewBuffer;
public Scan()
{
InitializeComponent();
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
// Initialize the camera object
_phoneCamera = new Microsoft.Devices.PhotoCamera(CameraType.Primary);
// _phoneCamera.Initialized += cam_Initialized;
_phoneCamera.Initialized += new EventHandler<Microsoft.Devices.CameraOperationCompletedEventArgs>(cam_Initialized);
_phoneCamera.AutoFocusCompleted += _phoneCamera_AutoFocusCompleted;
CameraButtons.ShutterKeyHalfPressed += CameraButtons_ShutterKeyHalfPressed;
//Display the camera feed in the UI
viewfinderBrush.SetSource(_phoneCamera);
// This timer will be used to scan the camera buffer every 250ms and scan for any barcodes
_scanTimer = new DispatcherTimer();
_scanTimer.Interval = TimeSpan.FromMilliseconds(250);
_scanTimer.Tick += (o, arg) => ScanForBarcode();
viewfinderCanvas.Tap += new EventHandler<System.Windows.Input.GestureEventArgs>(focus_Tapped);
base.OnNavigatedTo(e);
}
void _phoneCamera_AutoFocusCompleted(object sender, CameraOperationCompletedEventArgs e)
{
Deployment.Current.Dispatcher.BeginInvoke(delegate()
{
focusBrackets.Visibility = Visibility.Collapsed;
});
}
void focus_Tapped(object sender, System.Windows.Input.GestureEventArgs e)
{
try
{
if (_phoneCamera != null)
{
if (_phoneCamera.IsFocusAtPointSupported == true)
{
// Determine the location of the tap.
Point tapLocation = e.GetPosition(viewfinderCanvas);
// Position the focus brackets with the estimated offsets.
focusBrackets.SetValue(Canvas.LeftProperty, tapLocation.X - 30);
focusBrackets.SetValue(Canvas.TopProperty, tapLocation.Y - 28);
// Determine the focus point.
double focusXPercentage = tapLocation.X / viewfinderCanvas.ActualWidth;
double focusYPercentage = tapLocation.Y / viewfinderCanvas.ActualHeight;
// Show the focus brackets and focus at point.
focusBrackets.Visibility = Visibility.Visible;
_phoneCamera.FocusAtPoint(focusXPercentage, focusYPercentage);
}
}
}
catch (Exception ex)
{
_phoneCamera.Initialized += new EventHandler<Microsoft.Devices.CameraOperationCompletedEventArgs>(cam_Initialized);
}
}
void CameraButtons_ShutterKeyHalfPressed(object sender, EventArgs e)
{
_phoneCamera.Focus();
}
protected override void OnNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e)
{
//we're navigating away from this page, we won't be scanning any barcodes
_scanTimer.Stop();
if (_phoneCamera != null)
{
// Cleanup
_phoneCamera.Dispose();
_phoneCamera.Initialized -= cam_Initialized;
CameraButtons.ShutterKeyHalfPressed -= CameraButtons_ShutterKeyHalfPressed;
}
}
void cam_Initialized(object sender, Microsoft.Devices.CameraOperationCompletedEventArgs e)
{
if (e.Succeeded)
{
this.Dispatcher.BeginInvoke(delegate()
{
_phoneCamera.FlashMode = FlashMode.Off;
_previewBuffer = new WriteableBitmap((int)_phoneCamera.PreviewResolution.Width, (int)_phoneCamera.PreviewResolution.Height);
_barcodeReader = new BarcodeReader();
// By default, BarcodeReader will scan every supported barcode type
// If we want to limit the type of barcodes our app can read,
// we can do it by adding each format to this list object
//var supportedBarcodeFormats = new List<BarcodeFormat>();
//supportedBarcodeFormats.Add(BarcodeFormat.QR_CODE);
//supportedBarcodeFormats.Add(BarcodeFormat.DATA_MATRIX);
//_bcReader.PossibleFormats = supportedBarcodeFormats;
_barcodeReader.TryHarder = true;
_barcodeReader.ResultFound += _bcReader_ResultFound;
_scanTimer.Start();
});
}
else
{
Dispatcher.BeginInvoke(() =>
{
MessageBox.Show("Unable to initialize the camera");
});
}
}
void _bcReader_ResultFound(Result obj)
{
// If a new barcode is found, vibrate the device and display the barcode details in the UI
//if (!obj.Text.Equals(tbBarcodeData.Text))
//{
VibrateController.Default.Start(TimeSpan.FromMilliseconds(100));
//tbBarcodeType.Text = obj.BarcodeFormat.ToString();
//tbBarcodeData.Text = obj.Text;
//NavigationService.Navigate(new Uri(string.Format("/AddCustomer.xaml?parameter={0}", Uri.EscapeUriString(obj.Text), UriKind.Relative)));
PhoneApplicationService.Current.State["Text"] = obj.Text;
NavigationService.Navigate(new Uri("/PageYouWantToGetResult.xaml", UriKind.Relative));
}
private void ScanForBarcode()
{
//grab a camera snapshot
_phoneCamera.GetPreviewBufferArgb32(_previewBuffer.Pixels);
_previewBuffer.Invalidate();
//scan the captured snapshot for barcodes
//if a barcode is found, the ResultFound event will fire
_barcodeReader.Decode(_previewBuffer);
}
protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
{
NavigationService.Navigate(new Uri("/PageYouWantToNavigate.xaml", UriKind.Relative));
base.OnBackKeyPress(e);
}
}
}