Live Capture Barcode Reading

Take the following steps to easily add to your Xamarin application an additional feature: Live capture barcode reading.

1. Create a new Xamarin forms project and add the camera control by following the Adding a Basic Xamarin Camera Control tutorial.

2. Right-click the Solution in Visual Studio and select Manage NuGet packages for Solution. Type a search for "Leadtools.Barcode" to install/add it to your solution.

3. Once you have added the Leadtools.Barcode Nuget Package, add the following global variable to the MainPage:

   C#

   Leadtools.Barcode.BarcodeEngine barcodeEngine; 

4. In the MainPage constructor, after the license code and the InitializeComponent(), initialize the BarcodeEngine object, set the AutoRotateImage option of the Camera, and subscribe to the FrameReceived event:

   C#

   barcodeEngine = new Leadtools.Barcode.BarcodeEngine(); 
   leadCamera.CameraOptions.AutoRotateImage = true; 
   leadCamera.FrameReceived += LeadCamera_FrameReceived; 

5. Add the FrameReceived event:

   C#

   private void LeadCamera_FrameReceived(Leadtools.Camera.Xamarin.FrameHandlerEventArgs e) 
   { 
      if (e.Image != null) 
      { 
         var data = barcodeEngine.Reader.ReadBarcode(e.Image, Leadtools.LeadRect.Empty, Leadtools.Barcode.BarcodeSymbology.Unknown); 
    
         if (data != null && data.Value != null) 
         { 
            Device.BeginInvokeOnMainThread(() => 
            { 
               DisplayAlert("Barcode Found!", $"{data.Symbology} : {data.Value}", "OK"); 
            }); 
         } 
      } 
   } 

6. After completing the previous steps, you can build and run the project and deploy it to your device and start scanning barcodes.