// The project, which uses this code, must have references to the following assemblies:
// - Vintasoft.Twain

namespace TwainExamples_CSharp
{
    /// <summary>
    /// Class allows to scan and save image to a PDF document.
    /// </summary>
    public partial class How_to_save_acquired_images_to_PDF_document : System.Windows.Forms.Form
    {

        /// <summary>
        /// TWAIN device manager.
        /// </summary>
        Vintasoft.Twain.DeviceManager _deviceManager;



        public How_to_save_acquired_images_to_PDF_document()
        {
            InitializeComponent();

            // create and open device manager
            _deviceManager = new Vintasoft.Twain.DeviceManager(this);
            _deviceManager.Open();
        }



        /// <summary>
        /// Acquire images asynchronously.
        /// </summary>
        public void AcquireImagesAsynchronously()
        {
            try
            {
                // get reference to the default device
                Vintasoft.Twain.Device device = _deviceManager.DefaultDevice;

                // subscribe to the device events
                device.ImageAcquired += new System.EventHandler<Vintasoft.Twain.ImageAcquiredEventArgs>(device_ImageAcquired);
                device.ScanCanceled += new System.EventHandler(device_ScanCanceled);
                device.ScanFailed += new System.EventHandler<Vintasoft.Twain.ScanFailedEventArgs>(device_ScanFailed);
                device.ScanFinished += new System.EventHandler(device_ScanFinished);

                // disable UI
                device.ShowUI = false;

                // set Memory (or Native) transfer mode
                device.TransferMode = Vintasoft.Twain.TransferMode.Memory;

                // acquire images asynchronously
                device.Acquire();
            }
            catch (Vintasoft.Twain.TwainException ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// Image is acquired.
        /// </summary>
        private void device_ImageAcquired(object sender, Vintasoft.Twain.ImageAcquiredEventArgs e)
        {
            Vintasoft.Twain.Device device = (Vintasoft.Twain.Device)sender;

            // set settings of PDF encoder
            Vintasoft.Twain.ImageEncoders.TwainPdfEncoderSettings pdfEncoderSettings = new Vintasoft.Twain.ImageEncoders.TwainPdfEncoderSettings();
            pdfEncoderSettings.PdfDocumentInfo.Author = "VintaSoft Ltd.";
            pdfEncoderSettings.PdfDocumentInfo.Title = "Documents acquired from " + device.Info.ProductName;
            pdfEncoderSettings.PdfDocumentInfo.Creator = "VintaSoft Twain .NET SDK";
            pdfEncoderSettings.PdfDocumentInfo.ModificationDate = System.DateTime.Now;

            // add acquired image to an existing PDF document
            e.Image.Save(@"d:\test.pdf", pdfEncoderSettings);

            // dispose the acquired image
            e.Image.Dispose();
        }

        /// <summary>
        /// Scan is canceled.
        /// </summary>
        private void device_ScanCanceled(object sender, System.EventArgs e)
        {
            System.Windows.Forms.MessageBox.Show("Scan is canceled.");
        }

        /// <summary>
        /// Scan is failed.
        /// </summary>
        private void device_ScanFailed(object sender, Vintasoft.Twain.ScanFailedEventArgs e)
        {
            System.Windows.Forms.MessageBox.Show("Scan is failed: " + e.ErrorString);
        }

        /// <summary>
        /// Scan is finished.
        /// </summary>
        void device_ScanFinished(object sender, System.EventArgs e)
        {
            Vintasoft.Twain.Device device = (Vintasoft.Twain.Device)sender;

            // unsubscribe from device events
            device.ImageAcquired -= new System.EventHandler<Vintasoft.Twain.ImageAcquiredEventArgs>(device_ImageAcquired);
            device.ScanCanceled -= new System.EventHandler(device_ScanCanceled);
            device.ScanFailed -= new System.EventHandler<Vintasoft.Twain.ScanFailedEventArgs>(device_ScanFailed);
            device.ScanFinished -= new System.EventHandler(device_ScanFinished);

            // if device is not closed
            if (device.State != Vintasoft.Twain.DeviceState.Closed)
                // close the device
                device.Close();

            System.Windows.Forms.MessageBox.Show("Scan is finished.");
        }

    }
}