从 Universal Windows 应用程序中的图像解码条码

Question

我在 windows 平板电脑 (windows 10) 上实现了一个通用的 windows 应用程序。这个平板电脑有摄像头，我想拍下二维码并解码。

所以我试过 Zxing.net，但不适用于通用 windows 应用程序。有一种方法可以解码照片中的二维码。

 var bounds = ApplicationView.GetForCurrentView().VisibleBounds;
                var scaleFactor = DisplayInformation.GetForCurrentView().RawPixelsPerViewPixel;
                var size = new Size(bounds.Width * scaleFactor, bounds.Height * scaleFactor);

                CameraCaptureUI captureUI = new CameraCaptureUI();
                captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;
                captureUI.PhotoSettings.CroppedSizeInPixels = new Size(size.Width, size.Height);

                StorageFile file = await captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo);

                if (file != null)
                {
                    //QR code conversion from jepg and return string.
                }

我访问了一些链接...例如： https://github.com/Redth/ZXing.Net.Mobile 和 https://archive.codeplex.com/?p=zxingnet#trunk/Clients/WindowsRTDemo/Package.appxmanifest

但通用 windows 应用程序没有任何作用。解决方案？

Answer 1

But nothing work for universal windows app

通过我这边的测试，你链接的 sample 确实有效。

由于您没有提供解码条形码的代码片段，因此我提供了可以在我这边正常运行的整个项目，您可以测试并尝试找出您的代码片段有什么问题。

首先安装 ZXing.uwp nuget 包，并使用以下代码片段进行测试。

XAML

<StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
   <Image x:Name="imgshow" Height="150" Width="150"></Image>
   <TextBox x:Name="txtDecoderType"  Height="50" Width="250"></TextBox>
   <TextBox x:Name="txtDecoderContent"  Height="50" Width="250"></TextBox>
   <Button x:Name="btnscan" Click="btnscan_Click" Content=" scan"></Button>
</StackPanel>

代码隐藏

private async void btnscan_Click(object sender, RoutedEventArgs e)
{
    var bounds = ApplicationView.GetForCurrentView().VisibleBounds;
    var scaleFactor = DisplayInformation.GetForCurrentView().RawPixelsPerViewPixel;
    var size = new Size(bounds.Width * scaleFactor, bounds.Height * scaleFactor);
    CameraCaptureUI captureUI = new CameraCaptureUI();
    captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;
    captureUI.PhotoSettings.CroppedSizeInPixels = new Size(size.Width, size.Height);
    StorageFile file = await captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo);
    if (file != null)
    {
        //QR code conversion from jepg and return string.
        WriteableBitmap writeableBitmap;    
        using (IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
        {
            BitmapDecoder decoder = await BitmapDecoder.CreateAsync(fileStream);                
            writeableBitmap = new WriteableBitmap((int)decoder.PixelWidth, (int)decoder.PixelHeight);
            writeableBitmap.SetSource(fileStream);
            imgshow.Source = writeableBitmap;
        }
        // create a barcode reader instance
        IBarcodeReader reader = new BarcodeReader();
        // detect and decode the barcode inside the  writeableBitmap
        var barcodeReader = new BarcodeReader
        {
            AutoRotate = true,
            Options = { TryHarder = true }
        }; 
        Result result = reader.Decode(writeableBitmap);
        // do something with the result
        if (result != null)
        {
            txtDecoderType.Text = result.BarcodeFormat.ToString();
            txtDecoderContent.Text = result.Text;
        }
    }
}

此外，从1803开始，UWP还提供了条码扫描器的API，详情请参考this tutorial and the official sample.

从 Universal Windows 应用程序中的图像解码条码

Decode Barcode from Image in Universal Windows App

c#

camera

win-universal-app

qr-code