Как сохранить TWAIN отсканированные изображения в PDF документ?

В этом разделе

Изображение, которое получено от TWAIN сканера, можно сохранить в новый PDF документ или добавить в существующий PDF документ.

Вот C#/VB.NET код, который демонстрирует, как получить изображения от TWAIN сканера и сохранить изображения в PDF документ:

/// <summary>
/// Synchronously acquires not compressed images from TWAIN device and saves images to PDF file.
/// </summary>
static void AcquireNotCompressedImagesFromTwainDeviceAndSaveImagesToPdfFile()
{
    // create the device manager
    using (Vintasoft.Twain.DeviceManager deviceManager = new Vintasoft.Twain.DeviceManager())
    {
        // open the device manager
        deviceManager.Open();

        // get reference to the default device
        Vintasoft.Twain.Device device = deviceManager.DefaultDevice;

        // specify that device UI must not be used
        device.ShowUI = false;

        // open the device
        device.Open();

        // specify that Memory transfer mode must be used
        device.TransferMode = Vintasoft.Twain.TransferMode.Memory;

        // acquire images from device
        Vintasoft.Twain.AcquireModalState acquireModalState = Vintasoft.Twain.AcquireModalState.None;
        do
        {
            acquireModalState = device.AcquireModal();
            switch (acquireModalState)
            {
                case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                    // set settings of PDF encoder
                    Vintasoft.Twain.ImageEncoders.TwainPdfEncoderSettings pdfEncoderSettings = new Vintasoft.Twain.ImageEncoders.TwainPdfEncoderSettings();
                    pdfEncoderSettings.PdfDocumentInfo.Author = "VintaSoft LLC";
                    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
                    device.AcquiredImage.Save(@"d:\test.pdf", pdfEncoderSettings);

                    // dispose the acquired image
                    device.AcquiredImage.Dispose();
                    break;
            }
        }
        while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);

        // close the device
        device.Close();

        // close the device manager
        deviceManager.Close();
    }
}

VB.NET

''' <summary>
''' Synchronously acquires not compressed images from TWAIN device and saves images to PDF file.
''' </summary>
Private Shared Sub AcquireNotCompressedImagesFromTwainDeviceAndSaveImagesToPdfFile()
    ' create the device manager
    Using deviceManager As New Vintasoft.Twain.DeviceManager()
        ' open the device manager
        deviceManager.Open()

        ' get reference to the default device
        Dim device As Vintasoft.Twain.Device = deviceManager.DefaultDevice

        ' specify that device UI must not be used
        device.ShowUI = False

        ' open the device
        device.Open()

        ' specify that Memory transfer mode must be used
        device.TransferMode = Vintasoft.Twain.TransferMode.Memory

        ' acquire images from device
        Dim acquireModalState As Vintasoft.Twain.AcquireModalState = Vintasoft.Twain.AcquireModalState.None
        Do
            acquireModalState = device.AcquireModal()
            Select Case acquireModalState
                Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                    ' set settings of PDF encoder
                    Dim pdfEncoderSettings As New Vintasoft.Twain.ImageEncoders.TwainPdfEncoderSettings()
                    pdfEncoderSettings.PdfDocumentInfo.Author = "VintaSoft LLC"
                    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
                    device.AcquiredImage.Save("d:\test.pdf", pdfEncoderSettings)

                    ' dispose the acquired image
                    device.AcquiredImage.Dispose()
                    Exit Select
            End Select
        Loop While acquireModalState <> Vintasoft.Twain.AcquireModalState.None

        ' close the device
        device.Close()

        ' close the device manager
        deviceManager.Close()
    End Using
End Sub

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