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使用ZXing.Net.Mobile result.text作為WebView的輸入

[英]Use ZXing.Net.Mobile result.text as input for WebView

我目前正在嘗試為Windows 10創建一個條形碼掃描儀UWP App。其目的是我想使用掃描的條形碼作為Web搜索的輸入。

我使用了詳細記錄的ZXing.Net.Mobile軟件包,並且已經在應用程序中運行了掃描儀。 掃描儀啟動,掃描條形碼,結果顯示在消息框中。 我在MainPage.xaml.cs中使用了以下代碼行:

MobileBarcodeScanner scanner;

public MainPage()
{
    //Create a new instance of our scanner
    scanner = new MobileBarcodeScanner(this.Dispatcher);
    scanner.RootFrame = this.Frame;

    this.Loaded += MainPage_Loaded;
}

private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
    //Tell our scanner to use the default overlay
    scanner.UseCustomOverlay = false;
    //We can customize the top and bottom text of our default overlay
    scanner.TopText = "Hold camera up to barcode";
    scanner.BottomText = "Camera will automatically scan barcode\r\n\r\n" +
                         "Press the 'Back' button to Cancel";

    //Start scanning
    scanner.Scan().ContinueWith(t =>
    {
        if (t.Result != null)
            HandleScanResult(t.Result);
    });
}

async void HandleScanResult(ZXing.Result result)
{

    string msg = "";

    if (result != null && !string.IsNullOrEmpty(result.Text))
        msg = "Found Barcode: " + result.Text;
    else
        msg = "Scanning Canceled!";

    await MessageBox(msg);
}

async Task MessageBox(string text)
{
    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async () =>
    {
        var dialog = new MessageDialog(text);
        await dialog.ShowAsync();
    });
}

但是,我不希望掃描結果顯示在消息框中。 我想將其用於網絡搜索。 因此,我在MainPage.xaml頁面中創建了一個名為SearchURI的WebView:

<WebView Name="SearchURI" />

然后,我測試了Basic函數,導航到Google fo實例,並且工作正常:

public MainPage()
{
    SearchURI.Navigate(new Uri("https://www.google.com")); 
}

然后,我嘗試調整HandleScanResult以將result.text添加到預定義的Uri,並在WebView“ SearchURI”中打開組合的Uri,同時嘗試保留消息框以防掃描被取消。

async void HandleScanResult(ZXing.Result result)
{
    string msg = "";

    if (result != null && !string.IsNullOrEmpty(result.Text))
        SearchURI.Navigate(new Uri(
          "https://www.google.com/?gfe_rd=cr&ei=ccRwWIS7D8ao8weY9b_ADA#q=" + result.Text));
    else
        msg = "Scanning Canceled!";

    await MessageBox(msg);
}

但是,這些代碼行會遇到錯誤。

有人可以幫助我調整《准則》以使其正常工作嗎? 謝謝!

Dispatcher Navigate

await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async () =>
{
    SearchURI.Navigate(new Uri("https://www.google.com/?gfe_rd=cr&ei=ccRwWIS7D8ao8weY9b_ADA#q=" + result.Text));
});

實際上,這很容易。 以下完美的工作方式:

    private async void ScanButton_Click(object sender, RoutedEventArgs e)
    {
        var scanner = new MobileBarcodeScanner(this.Dispatcher);
        scanner.UseCustomOverlay = false;
        scanner.TopText = "Halte die Kamera vor den Barcode";
        scanner.BottomText = "Kamera scannt den Barcode automatisch\r\n\rDrücke 'zurück' zum abbrechen";

        var result = await scanner.Scan();

        SearchURI.Navigate(new Uri("https://www.google.com/?gfe_rd=cr&ei=ccRwWIS7D8ao8weY9b_ADA#q=" + result.Text));            
    }

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