Синхронное получение изображений от TWAIN/SANE сканера

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VintaSoft Web Twain сервис позволяет синхронно (в модальном цикле) получать изображения от TWAIN/SANE сканера.

Вот список шагов, которые необходимо выполнить для синхронного получения изображений от TWAIN/SANE сканера:

Откройте менеджер TWAIN/SANE устройства.
Выберите TWAIN/SANE устройство.
Откройте TWAIN/SANE устройство.
Установите параметры сканирования.
Начните модальный цикл получения изображений.
Извлекайте полученные изображения одно за другим, когда функция WebTwainDeviceJS.acquireModalSync вернёт WebAcquireModalStateEnumJS.ImageAcquired.
Прервите цикл, когда функция WebTwainDeviceJS.acquireModalSync вернёт WebAcquireModalStateEnumJS.None.

Вот JavaScript код, который демонстрирует как синхронно получить изображения от TWAIN/SANE сканера и сохранить полученные изображения в PDF документ:

JavaScript

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



/**
 * Synchronously acquires images from TWAIN/SANE 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 and SANE devices
    var twainService = new Vintasoft.Shared.WebServiceControllerJS(serviceUrl);

    // TWAIN/SANE 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/SANE device
        device = deviceManager.get_DefaultDevice();

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

        // create collection for images acquired from device
        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() ]);
                    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();
    }
}

Вот TypeScript код, который демонстрирует как синхронно получить изображения от TWAIN сканера и сохранить полученные изображения в PDF документ:

TYPESCRIPT

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/SANE scanner and saves acquired images to PDF file
    this.__synchronouslyAcquireImagesFromTwainScannerAndSaveToPdfFile();
  }


  /**
   * Synchronously acquires images from TWAIN/SANE 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 and SANE devices
    let twainService: Vintasoft.Shared.WebServiceControllerJS = new Vintasoft.Shared.WebServiceControllerJS(serviceUrl);

    // TWAIN/SANE 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/SANE device
      twainDevice = deviceManager.get_DefaultDevice();

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

      // create collection for images acquired from device
      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()]);
            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();
    }
  }

}

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