Barcode Reader User Guide for Xamarin

using DCVXamarin;

namespace SimpleBarcodeScanner
{
    public partial class App : Application
    {
        public static IDCVCameraEnhancer camera;
        public static IDCVBarcodeReader barcodeReader;
        public App(IDCVCameraEnhancer dce, IDCVBarcodeReader dbr)
        {
            InitializeComponent();
            camera = dce;
            barcodeReader = dbr;
            MainPage = new NavigationPage(new MainPage());
        }
    }
}

using DCVXamarin.Droid;

namespace SimpleBarcodeScanner.Droid
{
    ...
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            DCVCameraEnhancer dce = new DCVCameraEnhancer(context: this);
            DCVBarcodeReader dbr = new DCVBarcodeReader();
            LoadApplication(new App(dce, dbr));
            ...
        }
        ...
    }
}

using DCVXamarin.iOS;

namespace SimpleBarcodeScanner.iOS
{
    ...
    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
    {
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            global::Xamarin.Forms.Forms.Init();
            DCVCameraEnhancer dce = new DCVCameraEnhancer();
            DCVBarcodeReader dbr = new DCVBarcodeReader();
            LoadApplication(new App(dce, dbr));
            return base.FinishedLaunching(app, options);
        }
    }
}

namespace SimpleBarcodeScanner
{
    // Add ILicenseVerificationListener to the class and implement LicenseVerificationCallback.
    public partial class App : Application, ILicenseVerificationListener
    {
        public App(IDCVCameraEnhancer dce, IDCVBarcodeReader dbr)
        {
            ...
            // Initialize the license of barcode reader module. Please note that the following license is a public trial.
            barcodeReader.InitLicense("DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9", this);
            // You can add any extra barcode reader settings configurations after the license initialization
            ...
        }

        // Implement LicenseVerificationCallback to get message from the license server.
        public void LicenseVerificationCallback(bool isSuccess, string msg)
        {
            if (!isSuccess)
            {
                System.Console.WriteLine(msg);
            }
        }
    }
}

async void OnStartScanningButtonClicked(object sender, EventArgs e)
{
    await Navigation.PushAsync(new ScanningPage());
}

using DCVXamarin;

namespace SimpleBarcodeScanner
{
    public partial class ScanningPage : ContentPage
    {
        public ScanningPage()
        {
            InitializeComponent();
            // Bind the CameraEnhancer to the BarcodeReader so that it can continuously obtain video stream from the camera for barcode decoding.
            App.barcodeReader.SetCameraEnhancer(App.camera);
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();
            // Open the camera the the view appears.
            App.camera.Open();
            // Start barcode decoding thread when the view appears.
            App.barcodeReader.StartScanning();
        }

        protected override void OnDisappearing()
        {
            base.OnDisappearing();
            // Close the camera the the view appears.
            App.camera.Close();
            // Stop barcode decoding thread when the view appears.
            App.barcodeReader.StopScanning();
        }
    }
}

namespace SimpleBarcodeScanner
{
    // Add IBarcodeResultListener to your ScanningPage so that you can receive the barcode results.
    public partial class ScanningPage : ContentPage, IBarcodeResultListener
    {
        public ScanningPage()
        {
            ...
            App.barcodeReader.AddResultlistener(this);
        }
        ...
        // Implement the BarcodeResultCallback so that you can receive the barcode results when the barcodes are decoded.
        public void BarcodeResultCallback(int frameID, BarcodeResult[] barcodeResults)
        {
            // Here is an example code on how to display the barcode results on the view.
            string newBarcodeText = "";
            // The parameter 'barcodeResults' is an Array of BarcodeResult object.
            // Parse the 'barcodeResults' when it is not null.
            if (barcodeResults != null && barcodeResults.Length>0)
            {
                for (int i=0; i<barcodeResults.Length; i++)
                {
                    {
                        //The BarcodeText property of BarcodeResult is the string of barcode text result.
                        newBarcodeText += barcodeResults[i].BarcodeText;
                        newBarcodeText += "; ";
                    }
                }
                // On UI thread, refresh the previously prepared label with new barcode results.
                Device.BeginInvokeOnMainThread(()=> {
                    barcodeResultLabel.Text = newBarcodeText;
                });
            }
        }
    }
}

using Xamarin.Essentials;

namespace SimpleBarcodeScanner.Droid
{
    ...
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            ...
            // Add camera permission.
            Permissions.RequestAsync<Permissions.Camera>();
        }
        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
        {
            ...
            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}

BarcodeReader.UpdateRuntimeSettings(EnumDBRPresetTemplate.IMAGE_READ_RATE_FIRST);

DBRRuntimeSettings settings = barcodeReader.GetRuntimeSettings();
settings.BarcodeFormatIds = EnumBarcodeFormat.BF_ONED;
settings.ExpectedBarcodeCount = 0;
settings.Timeout = 1000;
barcodeReader.UpdateRuntimeSettings(settings);

DCVXamarin.Region region = new DCVXamarin.Region();
region.RegionTop = 30;
region.RegionBottom = 70;
region.RegionLeft = 15;
region.RegionRight = 85;
region.RegionMeasuredByPercentage = 1;
camera.ScanRegion(region);