Create a blank "Angular and ASP.NET Core" application.

"AngularApp1.Server" project: Add references to the Vintasoft assemblies.

"AngularApp1.Server" project: Create web service for barcode recognition.

• Press the right mouse button on the "Controllers" folder and select the "Add => Controller..." menu from context menu
  
• Select Empty API controller template, set the controller name to the "MyVintasoftBarcodeApiController" and press the "Add" button
  
• Specify that MyVintasoftBarcodeApiController class is derived from Vintasoft.Barcode.AspNetCore.ApiControllers.VintasoftBarcodeApiController class
  
  Here are source codes of MyVintasoftBarcodeApiController class:
  
  • C#

  using Vintasoft.Barcode.AspNetCore.ApiControllers;
  
  namespace WebApplication1.Controllers
  {
      public class MyVintasoftBarcodeApiController : VintasoftBarcodeApiController
      {
  
          public MyVintasoftBarcodeApiController(IWebHostEnvironment hostingEnvironment)
              : base(hostingEnvironment)
          {
          }
  
      }
  }
  
  

"AngularApp1.Server" project: Add reference to the nuget-package "Microsoft.AspNetCore.Mvc.NewtonsoftJson" for deserialization of barcode recognition results.

• Add reference to the nuget-package Microsoft.AspNetCore.Mvc.NewtonsoftJson to the "AngularApp1.Server" project:
  
  
  
• Open the "Program.cs" file and add code line "builder.Services.AddControllersWithViews().AddNewtonsoftJson();". This is necessary for correct deserialization of barcode recognition results.
  
  Here are source codes of Program.cs:
  
  • C#

  var builder = WebApplication.CreateBuilder(args);
  
  // Add services to the container.
  
  builder.Services.AddControllersWithViews().AddNewtonsoftJson();
  
  var app = builder.Build();
  
  app.UseDefaultFiles();
  app.MapStaticAssets();
  
  // Configure the HTTP request pipeline.
  
  app.UseHttpsRedirection();
  
  app.UseAuthorization();
  
  app.MapControllers();
  
  app.MapFallbackToFile("/index.html");
  
  app.Run();
  
  

"AngularApp1.Server" project: Specify image file that contains barcodes.

"AngularApp1.Server" project: Delete files, which are not necessary.

"angularapp1.client" project: Compile the solution for restoring TypeScript-dependencies in "angularapp1.client" project.

"angularapp1.client" project: Add JavaScript files and TypeScript modules to the "angularapp1.client" project.

• Add the "assets" folder to the "src\app\" folder in "angularapp1.client" project.
  
  
• Copy JavaScript-file "Vintasoft.Shared.js" from Github in "angularapp1.client" project.
  Copy TypeScript-file "Vintasoft.Shared.d.ts" from Github in "angularapp1.client" project.
  Copy JavaScript-file "Vintasoft.Barcode.js" from Github in "angularapp1.client" project.
  Copy TypeScript-file "Vintasoft.Barcode.d.ts" from Github in "angularapp1.client" project.
  
  
  
• Add references to Vintasoft JavaScript files to the "projects => angularapp1.client => architect => build => options => scripts" section in "angular.json" file in "angularapp1.client" project:
  • JSON

  ...
  "scripts": [
    "src/app/assets/Vintasoft.Shared.js",
    "src/app/assets/Vintasoft.Barcode.js"
  ]
  ...
  

  
  

"angularapp1.client" project: Create Angular component that recognizes barcodes in image.

• Open "src\app\app.component.html" file in "angularapp1.client" project, clear the file, add HTML markup (page header and image element that will display barcode recognition result) to the "app.component.html" file:
  • HTML

  <h1>Angular Barcode Reader Demo</h1>
  
  <div id="barcodeInformation"></div>
  
  

  
  
  
  
• Open "src\app\app.component.ts" file in "angularapp1.client" project, clear the file, add TypeScript code to the "app.component.ts" file:
  • TYPESCRIPT

  import { HttpClient } from '@angular/common/http';
  import { Component, OnInit } from '@angular/core';
  
  @Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
  })
  export class AppComponent implements OnInit {
    constructor(private http: HttpClient) {}
  
    ngOnInit() {
      // set the session identifier
      Vintasoft.Shared.WebImagingEnviromentJS.set_SessionId("SessionID");
  
      // create service that allows to recognize barcodes
      let barcodeService: Vintasoft.Shared.WebServiceControllerJS = new Vintasoft.Shared.WebServiceControllerJS("vintasoft/api/MyVintasoftBarcodeApi");
  
      // create the barcode reader
      let barcodeReader: Vintasoft.Barcode.WebBarcodeReaderJS = new Vintasoft.Barcode.WebBarcodeReaderJS(barcodeService);
      // specify that Code39 barcode must be searched
      barcodeReader.get_Settings().set_BarcodeType(new Vintasoft.Barcode.WebBarcodeTypeEnumJS("Code39"));
  
      // create web image that references to a file "AllSupportedBarcodes.png" in directory "/UploadedImageFiles/SessionID/"
      let imageSource: Vintasoft.Shared.WebImageSourceJS = new Vintasoft.Shared.WebImageSourceJS("AllSupportedBarcodes.png");
      let image: Vintasoft.Shared.WebImageJS = new Vintasoft.Shared.WebImageJS(imageSource, 0);
  
      // send an asynchronous request for barcode recognition
      barcodeReader.readBarcodes(image, this.__readBarcodes_success, this.__readBarcodes_fail);
    }
  
    /**
     * Barcodes are recognized successfully.
     * @param {object} data Object with information about recognized barcodes.
     */
    private __readBarcodes_success(data: any) {
      if (data.success) {
        // get the barcode recognition result
        let barcodeRecognitionResults: any[] = data.results;
  
        let htmlMarkup: string = '';
        // if no barcodes found
        if (barcodeRecognitionResults.length == 0) {
          htmlMarkup = 'No barcodes found.';
        }
        // if barcodes are found
        else {
          htmlMarkup = barcodeRecognitionResults.length.toString() + ' barcodes are found.<br />';
          htmlMarkup += '<br />';
  
          // for each recognized barcode
          for (let i: number = 0; i < barcodeRecognitionResults.length; i++) {
            // get the barcode recognition result
            let barcodeRecognitionResult: any = barcodeRecognitionResults[i];
  
            // output information about recognized barcode
            htmlMarkup += '[' + (i + 1) + ':' + barcodeRecognitionResult.barcodeType + ']<br />';
            htmlMarkup += '  Value: ' + barcodeRecognitionResult.value + '<br />';
            htmlMarkup += '  Confidence: ' + barcodeRecognitionResult.confidence + '<br />';
            htmlMarkup += '  Reading quality: ' + barcodeRecognitionResult.readingQuality.toFixed(2) + '<br />';
            htmlMarkup += '  Threshold: ' + barcodeRecognitionResult.threshold + '<br />';
            htmlMarkup += '  Region: ' +
              'LT=(' + barcodeRecognitionResult.region.leftTop.x + ',' + barcodeRecognitionResult.region.leftTop.y + '); ' +
              'RT=(' + barcodeRecognitionResult.region.rightTop.x + ',' + barcodeRecognitionResult.region.rightTop.y + '); ' +
              'LB=(' + barcodeRecognitionResult.region.leftBottom.x + ',' + barcodeRecognitionResult.region.leftBottom.y + '); ' +
              'RB=(' + barcodeRecognitionResult.region.rightBottom.x + ',' + barcodeRecognitionResult.region.rightBottom.y + '); ' +
              'Angle=' + barcodeRecognitionResult.region.angle.toFixed(1) + '°<br />';
  
            htmlMarkup += '<br />';
          }
        }
  
        let barcodeInformationElement: HTMLDivElement = document.getElementById("barcodeInformation") as HTMLDivElement;
        barcodeInformationElement.innerHTML = htmlMarkup;
      }
    }
  
    /**
     * Barcode recognition is failed.
     * @param {object} data Object with information about error.
     */
    private __readBarcodes_fail(data: any) {
      // show information about error
      alert(data.errorMessage);
    }
  
    title = 'angularapp1.client';
  }
  
  

  
  
  
  
• Delete file "src\app\app.component.spec.ts" in "angularapp1.client" project - file is not necessary.
  
  
• Open "src\proxy.conf.js" file in "angularapp1.client" project and specify that Angular aplication can have access to the ASP.NET Core Web API controller "/vintasoft/api/MyVintasoftBarcodeApi/" in "AngularApp1.Server" project:
  • JavaScript

  const { env } = require('process');
  
  const target = env.ASPNETCORE_HTTPS_PORT ? `https://localhost:${env.ASPNETCORE_HTTPS_PORT}` :
    env.ASPNETCORE_URLS ? env.ASPNETCORE_URLS.split(';')[0] : 'https://localhost:7200';
  
  const PROXY_CONFIG = [
    {
      context: [
        "/vintasoft/api/"
      ],
      target,
      secure: false
    }
  ]
  
  module.exports = PROXY_CONFIG;
  
  

  
  

Run the "Angular and ASP.NET Core application" and see the result.