Create a blank ASP.NET Core Web application.

Server side: Add references to the Vintasoft assemblies to ASP.NET Core Web application.

Server side: 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 Microsoft.AspNetCore.Hosting;
  using Microsoft.AspNetCore.Mvc;
  using Vintasoft.Barcode.AspNetCore.ApiControllers;
  
  namespace Project1.Controllers
  {
      public class MyVintasoftBarcodeApiController : VintasoftBarcodeApiController
      {
  
          public MyVintasoftBarcodeApiController(IWebHostEnvironment hostingEnvironment)
              : base(hostingEnvironment)
          {
          }
  
      }
  }
  

Server side: Add Newtonsoft JSON for deserialization of barcode recognition results.

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllersWithViews().AddNewtonsoftJson();
builder.Services.AddControllersWithViews();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();


app.MapControllerRoute(
    name: "default",
    pattern: "{controller}/{action=Index}/{id?}");

app.MapFallbackToFile("index.html");

app.Run();

Compile the project for restoring dependencies using 'npm'.

Client side: Delete files, which are not necessary in this demo.

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { RouterModule } from '@angular/router';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule.withServerTransition({ appId: 'ng-cli-universal' }),
    HttpClientModule,
    FormsModule,
    RouterModule.forRoot([
    ])
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Client side: Add JavaScript files and TypeScript modules to the ASP.NET Core Web application.

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

Client side: Create Angular component that recognizes barcodes in image.

• Create folder "wwwroot\UploadedImageFiles\SessionID" and copy image file with barcodes "<InstallPath>VintaSoft\Barcode .NET v14.3\Images\AllSupportedBarcodes.png" to the folder. We will recognize barcodes in this image.
  
  
  Create folder "ClientApp\src\app\barcode-reader-demo\".
  
  
  Create "barcode-reader-demo.component.html" file that will contain HTML markup of Angular component:
  • Select "Add => New Item..." context menu for folder "ClientApp\src\app\barcode-reader-demo\" => "Add new item" dialog will appear
  • Select "HTML Page" type for new item
  • Set "barcode-reader-demo.component.html" as element name
  • Click the "Add" button => dialog will be closed and file "barcode-reader-demo.component.html" will be added into folder "ClientApp\src\app\barcode-reader-demo\"
  
  Add HTML markup (demo header and image element that will display barcode recognition result) to the "barcode-reader-demo.component.html" file:
  • HTML

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

  
  
  
  Create "barcode-reader-demo.component.ts" file that will contain code of Angular component:
  • Select "Add => New Item..." context menu for folder "ClientApp\src\app\barcode-reader-demo\" => "Add new item" dialog will appear
  • Select "TypeScript File" type for new item
  • Set "barcode-reader-demo.component.ts" as element name
  • Click the "Add" button => dialog will be closed and file "barcode-reader-demo.component.ts" will be added into folder "ClientApp\src\app\barcode-reader-demo\"
  
  Add TypeScript code to the "barcode-reader-demo.component.cs" file:
  • TYPESCRIPT

  import { Component } from '@angular/core';
  
  @Component({
    selector: 'barcode-reader-demo',
    templateUrl: './barcode-reader-demo.component.html'
  })
  export class BarcodeReaderDemoComponent {
  
    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: Vintasoft.Barcode.WebBarcodeReadResponseParamsJS) {
      if (data.success) {
        // get the barcode recognition result
        let barcodeRecognitionResults: Vintasoft.Barcode.WebBarcodeRecognitionResultJS[] = 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: Vintasoft.Barcode.WebBarcodeRecognitionResultJS = 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) {
      // show information about error
      alert(data.errorMessage);
    }
  }
  
  

  
  
  
  
• Add created Angular component to the Angular application module - "ClientApp\src\app\app.module.ts" file.
  Here are source codes of "app.module.ts" file after update:
  
  • TYPESCRIPT

  import { BrowserModule } from '@angular/platform-browser';
  import { NgModule } from '@angular/core';
  import { FormsModule } from '@angular/forms';
  import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
  import { RouterModule } from '@angular/router';
  
  import { AppComponent } from './app.component';
  import { BarcodeReaderDemoComponent } from './barcode-reader-demo/barcode-reader-demo.component';
  
  @NgModule({
    declarations: [
      AppComponent,
      BarcodeReaderDemoComponent
    ],
    imports: [
      BrowserModule.withServerTransition({ appId: 'ng-cli-universal' }),
      HttpClientModule,
      FormsModule,
      RouterModule.forRoot([
        { path: '', component: BarcodeReaderDemoComponent, pathMatch: 'full' },
      ])
    ],
    providers: [],
    bootstrap: [AppComponent]
  })
  export class AppModule { }
  
  

  
  

Run the ASP.NET Core Web application with Angular and see the result.