// synchronously acquire images from TWAIN/WIA/SANE/eSCL image scanner and saves acquired images to PDF file
__synchronouslyAcquireImagesFromTwainScannerAndSaveToPdfFile();



/**
 * Synchronously acquires images from TWAIN/WIA/SANE/eSCL image scanner and saves acquired images to PDF file.
 */
function __synchronouslyAcquireImagesFromTwainScannerAndSaveToPdfFile() {
    // register the evaluation version of VintaSoft Web TWAIN service
    // please read how to get evaluation license in documentation: https://www.vintasoft.ru/docs/vstwain-dotnet-web/Licensing-Twain_Web-Evaluation.html
    Vintasoft.Twain.WebTwainGlobalSettingsJS.register('REG_USER', 'REG_URL', 'REG_CODE', 'EXPIRATION_DATE');

    // URL to the VintaSoft Web TWAIN service
    var serviceUrl = 'https://localhost:25329/api/VintasoftTwainApi';
    // a Web API controller that allows to work with TWAIN/WIA/SANE/eSCL/eSCL devices
    var twainService = new Vintasoft.Shared.WebServiceControllerJS(serviceUrl);

    // TWAIN/WIA/SANE/eSCL device manager
    var deviceManager = new Vintasoft.Twain.WebTwainDeviceManagerJS(twainService);

    // the default settings of device manager
    var deviceManagerInitSetting = new Vintasoft.Twain.WebTwainDeviceManagerInitSettingsJS();

    var device = null;
    try {
        // open device manager
        deviceManager.open(deviceManagerInitSetting);

        // get the default TWAIN/WIA/SANE/eSCL device
        device = deviceManager.get_DefaultDevice();

        // open device without UI
        device.open(false);

        // a collection that stores images, which are acquired from TWAIN/WIA/SANE/eSCL devices and stored in memory of VintaSoft Web TWAIN service
        var acquiredImages = new Vintasoft.Twain.WebAcquiredImageCollectionJS(deviceManager);

        var acquireModalState;
        do {
            // do one step of modal image acquisition process
            var acquireModalResult = device.acquireModalSync();
            // get state of image acquisition
            acquireModalState = acquireModalResult.get_AcquireModalState().valueOf();

            switch (acquireModalState) {
                case 2:   // image is acquired
                    // get acquired image
                    var acquiredImage = acquireModalResult.get_AcquiredImage();
                    // add acquired image to the collection of acquired images
                    acquiredImages.add(acquiredImage);

                    // save acquired image to "result.pdf" file
                    acquiredImages.saveImages("d:\\result.pdf", false, [ acquiredImage.get_Id() ]);

                    // clear image collection (delete images from memory of VintaSoft Web TWAIN service) because image is not necessary anymore
                    acquiredImages.clear();
                    break;

                case 4:   // image scan is failed
                    alert(acquireModalResult.get_ErrorMessage());
                    break;

                case 9:   // image scan is finished
                    break;
            }
        }
        while (acquireModalState !== 0);
    }
    catch (ex) {
        alert(ex);
    }
    finally {
        if (device != null) {
            // close the device
            device.close();
        }
        // close the device manager
        deviceManager.close();
    }
}

import { Component } from '@angular/core';

@Component({
  selector: 'twain-scanning-demo',
  templateUrl: './twain-scanning-demo.component.html'
})
export class TwainScanningDemoComponent {

  ngOnInit() {
    // synchronously acquire images from TWAIN/WIA/SANE/eSCL image scanner and saves acquired images to PDF file
    this.__synchronouslyAcquireImagesFromTwainScannerAndSaveToPdfFile();
  }


  /**
   * Synchronously acquires images from TWAIN/WIA/SANE/eSCL image scanner and saves acquired images to PDF file.
   */
  __synchronouslyAcquireImagesFromTwainScannerAndSaveToPdfFile() {
    // register the evaluation version of VintaSoft Web TWAIN service
    // please read how to get evaluation license in documentation: https://www.vintasoft.ru/docs/vstwain-dotnet-web/Licensing-Twain_Web-Evaluation.html
    Vintasoft.Twain.WebTwainGlobalSettingsJS.register('REG_USER', 'REG_URL', 'REG_CODE', 'EXPIRATION_DATE');

    // URL to the VintaSoft Web TWAIN service
    let serviceUrl: string = 'https://localhost:25329/api/VintasoftTwainApi';
    // a Web API controller that allows to work with TWAIN/WIA/SANE/eSCL/eSCL devices
    let twainService: Vintasoft.Shared.WebServiceControllerJS = new Vintasoft.Shared.WebServiceControllerJS(serviceUrl);

    // TWAIN/WIA/SANE/eSCL device manager
    let deviceManager: Vintasoft.Twain.WebTwainDeviceManagerJS = new Vintasoft.Twain.WebTwainDeviceManagerJS(twainService);

    // the default settings of device manager
    let deviceManagerInitSetting: Vintasoft.Twain.WebTwainDeviceManagerInitSettingsJS = new Vintasoft.Twain.WebTwainDeviceManagerInitSettingsJS();

    try {
      // open device manager
      deviceManager.open(deviceManagerInitSetting);
    }
    catch (ex) {
      alert(ex);
      return;
    }

    let twainDevice: Vintasoft.Twain.WebTwainDeviceJS = null;
    try {
      // get the default TWAIN/WIA/SANE/eSCL device
      twainDevice = deviceManager.get_DefaultDevice();

      // open device without UI
      twainDevice.open(false);

      // a collection that stores images, which are acquired from TWAIN/WIA/SANE/eSCL devices and stored in memory of VintaSoft Web TWAIN service
      let acquiredImages: Vintasoft.Twain.WebAcquiredImageCollectionJS = new Vintasoft.Twain.WebAcquiredImageCollectionJS(deviceManager);

      let acquireModalState: number;
      do {
        // do one step of modal image acquisition process
        let acquireModalResult: Vintasoft.Twain.WebTwainDeviceAcquireModalResultJS = twainDevice.acquireModalSync();
        // get state of image acquisition
        acquireModalState = acquireModalResult.get_AcquireModalState().valueOf() as number;

        switch (acquireModalState) {
          case 2:   // image is acquired
            // get acquired image
            let acquiredImage: Vintasoft.Twain.WebAcquiredImageJS = acquireModalResult.get_AcquiredImage();
            // add acquired image to the collection of acquired images
            acquiredImages.add(acquiredImage);

            // save acquired image to "result.pdf" file
            acquiredImages.saveImages("d:\\result.pdf", false, [acquiredImage.get_Id()]);

            // clear image collection (delete images from memory of VintaSoft Web TWAIN service) because image is not necessary anymore
            acquiredImages.clear();
            break;

          case 4:   // image scan is failed
            alert(acquireModalResult.get_ErrorMessage());
            break;

          case 9:   // image scan is finished
            break;
        }
      }
      while (acquireModalState !== 0);
    }
    catch (ex) {
      alert(ex);
    }
    finally {
      if (twainDevice != null) {
        // close the device
        twainDevice.close();
      }
      // close the device manager
      deviceManager.close();
    }
  }

}