// get information about capability value from TWAIN/WIA/SANE/eSCL image scanner
__getCapValueFromTwainScanner();



/**
 * Returns information about capability value from TWAIN/WIA/SANE/eSCL image scanner.
 */
function __getCapValueFromTwainScanner() {
    // register the evaluation version of VintaSoft Web TWAIN service
    // please read how to get evaluation license in documentation: https://www.vintasoft.com/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 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);

        // if device is SANE device
        if (device.get_IsSane()) {
            // get "mode" option of SANE device
            var scanModeOption = device.getCapability("mode", new Vintasoft.Twain.WebTwainDeviceCapabilityUsageModeEnumJS("Get"));
            // if "mode" option is supported by SANE device
            if (scanModeOption != null) {
                // output information about current scan mode
                console.log("Current scan mode: " + scanModeOption.get_CurrentValue());

                // get supported scan modes
                var supportedScanModes = scanModeOption.get_SupportedValues();
                var supportedScanModesAsArray = supportedScanModess.get_SupportedValuesAsArray();
                var supportedScanModesString = "Supported scan modes: ";
                // for each supported scan mode
                for (var j = 0; j < supportedScanModesAsArray.length; j++) {
                    supportedScanModesString += supportedScanModesAsArray[j].toString() + ' ';
                }
                // output information about supported scan modes
                console.log(supportedScanModesString);
            }
        }
        // if device is TWAIN device
        else if (device.get_IsTwain()) {
            // get IPixelType capability of TWAIN device
            var pixelTypeCap = device.getCapability(
                new Vintasoft.Twain.WebTwainDeviceCapabilityIdEnumJS("IPixelType"),
                new Vintasoft.Twain.WebTwainDeviceCapabilityUsageModeEnumJS("Get"));
            // if IPixelType capability is supported by TWAIN device
            if (pixelTypeCap != null) {
                // output information about current pixel type
                console.log("Current pixel type: " + pixelTypeCap.get_CurrentValue());
                // output information about default pixel type
                console.log("Default pixel type: " + pixelTypeCap.get_DefaultValue());

                // get supported pixel types
                var supportedPixelTypes = pixelTypeCap.get_SupportedValues();
                var supportedPixelTypesAsArray = supportedPixelTypes.get_SupportedValuesAsArray();
                var supportedPixelTypesString = "Supported pixel types: ";
                // for each supported pixel type
                for (var j = 0; j < supportedPixelTypesAsArray.length; j++) {
                    supportedPixelTypesString += supportedPixelTypesAsArray[j].toString() + ' ';
                }
                // output information about supported pixel types
                console.log(supportedPixelTypesString);
            }
        }

        // 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 image collection
                    acquiredImages.add(acquiredImage);

                    // get image as Base64 string
                    var bitmapAsBase64String = acquiredImage.getAsBase64String();
                    // update image preview
                    var previewImageElement = document.getElementById('previewImage');
                    previewImageElement.src = bitmapAsBase64String;

                    // 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() {
    // get information about capability value from TWAIN/WIA/SANE/eSCL device
    this.__getCapValueFromTwainScanner();
  }


  /**
   * Returns information about capability value from TWAIN/WIA/SANE/eSCL device.
   */
  __getCapValueFromTwainScanner() {
    // register the evaluation version of VintaSoft Web TWAIN service
    // please read how to get evaluation license in documentation: https://www.vintasoft.com/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 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 device: Vintasoft.Twain.WebTwainDeviceJS = null;
    try {
      // get the default TWAIN/WIA/SANE/eSCL device
      device = deviceManager.get_DefaultDevice();

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

      // if device is SANE device
      if (device.get_IsSane()) {
        // get "mode" option of SANE device
        let scanModeOption: Vintasoft.Twain.WebTwainCapabilityInfoJS = device.getCapability(
          "mode",
          new Vintasoft.Twain.WebTwainDeviceCapabilityUsageModeEnumJS("Get"));
        // if "mode" option is supported by SANE device
        if (scanModeOption != null) {
          // output information about current scan mode
          console.log("Current scan mode: " + scanModeOption.get_CurrentValue());

          // get supported scan modes
          let supportedScanModes: Vintasoft.Twain.WebTwainCapabilitySupportedValuesJS = scanModeOption.get_SupportedValues();
          let supportedScanModesAsArray: object[] = supportedScanModes.get_SupportedValuesAsArray();
          let supportedScanModesString: string = "Supported scan modes: ";
          // for each supported scan mode
          for (let j: number = 0; j < supportedScanModesAsArray.length; j++) {
            supportedScanModesString += supportedScanModesAsArray[j].toString() + ' ';
          }
          // output information about supported scan modes
          console.log(supportedScanModesString);
        }
      }
      // if device is TWAIN device
      else if (device.get_IsTwain()) {
        // get IPixelType capability of TWAIN device
        let pixelTypeCap: Vintasoft.Twain.WebTwainCapabilityInfoJS = device.getCapability(
          new Vintasoft.Twain.WebTwainDeviceCapabilityIdEnumJS("IPixelType"),
          new Vintasoft.Twain.WebTwainDeviceCapabilityUsageModeEnumJS("Get"));
        // if IPixelType capability is supported by TWAIN image scanner
        if (pixelTypeCap != null) {
          // output information about current pixel type
          console.log("Current pixel type: " + pixelTypeCap.get_CurrentValue());
          // output information about default pixel type
          console.log("Default pixel type: " + pixelTypeCap.get_DefaultValue());

          // get supported pixel types
          let supportedPixelTypes: Vintasoft.Twain.WebTwainCapabilitySupportedValuesJS = pixelTypeCap.get_SupportedValues();
          let supportedPixelTypesAsArray: object[] = supportedPixelTypes.get_SupportedValuesAsArray();
          let supportedPixelTypesString: string = "Supported pixel types: ";
          // for each supported pixel type
          for (let j: number = 0; j < supportedPixelTypesAsArray.length; j++) {
            supportedPixelTypesString += supportedPixelTypesAsArray[j].toString() + ' ';
          }
          // output information about supported pixel types
          console.log(supportedPixelTypesString);
        }
      }

      // 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 = device.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 image collection
            acquiredImages.add(acquiredImage);

            // get image as Base64 string
            let bitmapAsBase64String: string = acquiredImage.getAsBase64String();
            // update image preview
            let previewImageElement: HTMLImageElement = document.getElementById('previewImage') as HTMLImageElement;
            previewImageElement.src = bitmapAsBase64String;

            // 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();
    }
  }

}