Как сохранить TWAIN отсканированные изображения в TIFF файл?

В этом разделе

Вы можете получить изображение от TWAIN сканера и сохранить его в файл TIFF двумя способами:

1. C помощью TIFF кодека из SDK для режимов передачи Native или Memory

Этот метод работает с любым TWAIN сканером.
Изображение кодируется с помощью внутреннего кодека SDK.
Изображение сохраняется в файл TIFF с помощью метода Vintasoft.Twain.AcquiredImage.Save.

Вот C#/VB.NET код, который демонстрирует, как отсканировать изображение и сохранить его в файл TIFF, используя кодик TIFF из SDK:

/// <summary>
/// Synchronously acquires not compressed images from TWAIN device and saves images to a multipage TIFF file.
/// </summary>
static void AcquireNotCompressedImagesFromTwainDeviceAndSaveImagesToTiffFile()
{
    // 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;
        do
        {
            acquireModalState = device.AcquireModal();
            switch (acquireModalState)
            {
                case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                    Vintasoft.Twain.ImageEncoders.TwainTiffEncoderSettings twainCodecParams =
                        new Vintasoft.Twain.ImageEncoders.TwainTiffEncoderSettings();
                    twainCodecParams.TiffCompression = Vintasoft.Twain.ImageEncoders.TwainTiffCompression.LZW;
                    twainCodecParams.TiffMultiPage = true;

                    // save acquired image to disk using TIFF encoder of SDK
                    device.AcquiredImage.Save("test.tiff", twainCodecParams);

                    // 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 a multipage TIFF file.
''' </summary>
Private Shared Sub AcquireNotCompressedImagesFromTwainDeviceAndSaveImagesToTiffFile()
        ' 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
                Do
                        acquireModalState = device.AcquireModal()
                        Select Case acquireModalState
                                Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                                        Dim twainCodecParams As New Vintasoft.Twain.ImageEncoders.TwainTiffEncoderSettings()
                                        twainCodecParams.TiffCompression = Vintasoft.Twain.ImageEncoders.TwainTiffCompression.LZW
                                        twainCodecParams.TiffMultiPage = True

                                        ' save acquired image to disk using TIFF encoder of SDK
                                        device.AcquiredImage.Save("test.tiff", twainCodecParams)

                                        ' 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

2. С помощью TIFF кодека TWAIN драйвера для режима передачи File

Драйвер TWAIN должен иметь встроенный кодек TIFF - вы можете проверить это с помощью метода Vintasoft.Twain.Device.GetSupportedImageFileFormats.
Драйвер TWAIN кодирует полученное изображение и сохраняет его непосредственно в файл на диск.
Имя файла TIFF можно задать с помощью свойства Vintasoft.Twain.Device.FileName.

Вот C#/VB.NET код, который демонстрирует, как сохранить полученное изображение непосредственно на диск в виде файла TIFF:

/// <summary>
/// Starts synchronous acquisition of image from TWAIN device and specifies that acquired images must be saved directly to TIFF files on disk.
/// </summary>
static void StartSynchronousTwainScanningAndSpecifyThatImagesMustBeSavedDirectlyToTiffFiles()
{
    // 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();

        // check if device driver can save image to disk as TIFF files
        Vintasoft.Twain.TwainImageFileFormat[] supportedImageFileFormats = device.GetSupportedImageFileFormats();
        bool isTiffFileFormatSupported = false;
        for (int i = 0; i < supportedImageFileFormats.Length; i++)
        {
            if (supportedImageFileFormats[i] == Vintasoft.Twain.TwainImageFileFormat.Tiff)
            {
                isTiffFileFormatSupported = true;
                break;
            }
        }
        //
        if (!isTiffFileFormatSupported)
        {
            // close the device
            device.Close();
            System.Windows.Forms.MessageBox.Show("Device cannot save acquired image directly to disk as TIFF image.");
            return;
        }

        // specify that File transfer mode must be used
        device.TransferMode = Vintasoft.Twain.TransferMode.File;
        // save images as JPEG files
        device.FileFormat = Vintasoft.Twain.TwainImageFileFormat.Tiff;

        int acquiredImageCount = 0;

        // acquire images from device
        Vintasoft.Twain.AcquireModalState acquireModalState;
        do
        {
            acquireModalState = device.AcquireModal();
            switch (acquireModalState)
            {
                case Vintasoft.Twain.AcquireModalState.ImageAcquiring:
                    // set the filename for image
                    device.FileName = string.Format("test{0}.tif", acquiredImageCount);
                    break;

                case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                    // image is already saved to disk as TIFF file

                    // increment image count
                    acquiredImageCount = acquiredImageCount + 1;
                    break;
            }
        }
        while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);

        // close the device
        device.Close();

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

VB.NET

''' <summary>
''' Starts synchronous acquisition of image from TWAIN device and specifies that acquired images must be saved directly to TIFF files on disk.
''' </summary>
Private Shared Sub StartSynchronousTwainScanningAndSpecifyThatImagesMustBeSavedDirectlyToTiffFiles()
        ' 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()

                ' check if device driver can save image to disk as TIFF files
                Dim supportedImageFileFormats As Vintasoft.Twain.TwainImageFileFormat() = device.GetSupportedImageFileFormats()
                Dim isTiffFileFormatSupported As Boolean = False
                For i As Integer = 0 To supportedImageFileFormats.Length - 1
                        If supportedImageFileFormats(i) = Vintasoft.Twain.TwainImageFileFormat.Tiff Then
                                isTiffFileFormatSupported = True
                                Exit For
                        End If
                Next
                '
                If Not isTiffFileFormatSupported Then
                        ' close the device
                        device.Close()
                        System.Windows.Forms.MessageBox.Show("Device cannot save acquired image directly to disk as TIFF image.")
                        Return
                End If

                ' specify that File transfer mode must be used
                device.TransferMode = Vintasoft.Twain.TransferMode.File
                ' save images as JPEG files
                device.FileFormat = Vintasoft.Twain.TwainImageFileFormat.Tiff

                Dim acquiredImageCount As Integer = 0

                ' acquire images from device
                Dim acquireModalState As Vintasoft.Twain.AcquireModalState
                Do
                        acquireModalState = device.AcquireModal()
                        Select Case acquireModalState
                                Case Vintasoft.Twain.AcquireModalState.ImageAcquiring
                                        ' set the filename for image
                                        device.FileName = String.Format("test{0}.tif", acquiredImageCount)
                                        Exit Select

                                Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                                        ' image is already saved to disk as TIFF file

                                        ' increment image count
                                        acquiredImageCount = acquiredImageCount + 1
                                        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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