Read Barcode by XING

i use this code:

public partial class PageScanner : ContentPage
{
    
    public PageScanner()
    {
       
        InitializeComponent();

        zxing.OnScanResult += (result) => Device.BeginInvokeOnMainThread(() => {
            lblResult.Text = result.Text;

            // Emetti un suono

            zxing.IsScanning = false; // Chiudi la videocamera
                                      // await  Navigation.PushAsync(new Page1());
                                      //  zxing.IsVisible = false;
        });
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();
        zxing.IsScanning = true;
    }
    protected override void OnDisappearing()
    {
        zxing.IsScanning = false;
        base.OnDisappearing();
    }
}

it works good.

i need to open the scanner/camera by clicking a button on this page and not on Appearing as it works now

Can Anyone help ME?

THANKS

Certainly! To open the scanner/camera by clicking a button instead of it appearing automatically, you can modify your code as follows:

1. Remove the `OnAppearing` and `OnDisappearing` methods from your `PageScanner` class.

2. Create a button in your XAML file (`PageScanner.xaml`) to trigger the opening of the scanner/camera. For example:

3. In your code-behind (`PageScanner.xaml.cs`), add the event handler for the button's `Clicked` event:

private void OnOpenScannerClicked(object sender, EventArgs e)
{
    zxing.IsScanning = true; // Open the scanner/camera
}

4. Update your existing `OnScanResult` event handler to handle the result and close the scanner/camera:

zxing.OnScanResult += (result) =>
{
    Device.BeginInvokeOnMainThread(() =>
    {
        lblResult.Text = result.Text;
        // Emetti un suono

        zxing.IsScanning = false; // Close the scanner/camera
    });
};

With these modifications, the scanner/camera will only open when the "Open Scanner" button is clicked. Once the barcode is scanned, the result will be displayed in `lblResult`, and the scanner/camera will close.

Remember to adjust the event handler names and other details as per your code structure.

1 Reply

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Rajkiran Swain3y ago
Accepted answer
Certainly! To open the scanner/camera by clicking a button instead of it appearing automatically, you can modify your code as follows:

1. Remove the `OnAppearing` and `OnDisappearing` methods from your `PageScanner` class.

2. Create a button in your XAML file (`PageScanner.xaml`) to trigger the opening of the scanner/camera. For example:
3. In your code-behind (`PageScanner.xaml.cs`), add the event handler for the button's `Clicked` event:
```
private void OnOpenScannerClicked(object sender, EventArgs e)
{
    zxing.IsScanning = true; // Open the scanner/camera
}
```
4. Update your existing `OnScanResult` event handler to handle the result and close the scanner/camera:
```
zxing.OnScanResult += (result) =>
{
    Device.BeginInvokeOnMainThread(() =>
    {
        lblResult.Text = result.Text;
        // Emetti un suono

        zxing.IsScanning = false; // Close the scanner/camera
    });
};
```
With these modifications, the scanner/camera will only open when the "Open Scanner" button is clicked. Once the barcode is scanned, the result will be displayed in `lblResult`, and the scanner/camera will close.

Remember to adjust the event handler names and other details as per your code structure.