Acquire images from SANE scanner synchronously

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VintaSoft Twain .NET SDK allows to acquire images from SANE scanner synchronously (in a modal loop).

Here are steps, which should be done for synchronous acquisition of images from SANE device:

Open SANE device manager.
Open SANE device.
Set the scanning settings.
Start the acquisition modal loop.
Acquire images from SANE device one by one using SaneLocalDevice.AcquireImageSync method until SaneLocalDevice.HasMoreImagesToScan property returns true.

Here is an example that demonstrates how to synchronously acquire images from SANE device and save acquired images to a PDF document:

/// <summary>
/// Synchronously acquire images from SANE device.
/// </summary>
public void SynchronouslyAcquireImagesFromSaneDevice()
{
    // create SANE device manager
    using (Vintasoft.Sane.SaneLocalDeviceManager deviceManager = new Vintasoft.Sane.SaneLocalDeviceManager())
    {
        // open SANE device manager
        deviceManager.Open();

        // get count of SANE devices
        int deviceCount = deviceManager.Devices.Count;
        if (deviceCount == 0)
        {
            System.Console.WriteLine("Devices are not found.");
            return;
        }

        // select the first SANE device
        Vintasoft.Sane.SaneLocalDevice device = deviceManager.Devices[0];

        // open SANE device
        device.Open();

        int imageIndex = 0;
        Vintasoft.Sane.SaneAcquiredImage acquiredImage;
        do
        {
            try
            {
                // acquire image from SANE device
                acquiredImage = device.AcquireImageSync();
                // if image is received
                if (acquiredImage != null)
                {
                    imageIndex++;
                    string filename = string.Format("scannedImage-{0}.png", imageIndex);
                    if (System.IO.File.Exists(filename))
                        System.IO.File.Delete(filename);

                    acquiredImage.Save(filename);

                    System.Console.WriteLine(string.Format("Acquired image is saved to a file '{0}'.", filename));
                }
                // if image is not received
                else
                {
                    System.Console.WriteLine("Scan is completed.");
                    break;
                }
            }
            catch (System.Exception ex)
            {
                System.Console.WriteLine(string.Format("Scan is failed: {0}", ex.Message));
                break;
            }
        }
        // while device has more images to scan
        while (device.HasMoreImagesToScan);

        // close SANE device
        device.Close();

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

    System.Console.ReadLine();
}

VB.NET

''' <summary>
''' Synchronously acquire images from SANE device.
''' </summary>
Public Sub SynchronouslyAcquireImagesFromSaneDevice()
        ' create SANE device manager
        Using deviceManager As New Vintasoft.Sane.SaneLocalDeviceManager()
                ' open SANE device manager
                deviceManager.Open()

                ' get count of SANE devices
                Dim deviceCount As Integer = deviceManager.Devices.Count
                If deviceCount = 0 Then
                        System.Console.WriteLine("Devices are not found.")
                        Return
                End If

                ' select the first SANE device
                Dim device As Vintasoft.Sane.SaneLocalDevice = deviceManager.Devices(0)

                ' open SANE device
                device.Open()

                Dim imageIndex As Integer = 0
                Dim acquiredImage As Vintasoft.Sane.SaneAcquiredImage
                Do
                        Try
                                ' acquire image from SANE device
                                acquiredImage = device.AcquireImageSync()
                                ' if image is received
                                If acquiredImage IsNot Nothing Then
                                        imageIndex += 1
                                        Dim filename As String = String.Format("scannedImage-{0}.png", imageIndex)
                                        If System.IO.File.Exists(filename) Then
                                                System.IO.File.Delete(filename)
                                        End If

                                        acquiredImage.Save(filename)

                                        System.Console.WriteLine(String.Format("Acquired image is saved to a file '{0}'.", filename))
                                Else
                                        ' if image is not received
                                        System.Console.WriteLine("Scan is completed.")
                                        Exit Try
                                End If
                        Catch ex As System.Exception
                                System.Console.WriteLine(String.Format("Scan is failed: {0}", ex.Message))
                                Exit Try
                        End Try
                ' while device has more images to scan
                Loop While device.HasMoreImagesToScan

                ' close SANE device
                device.Close()

                ' close SANE device manager
                deviceManager.Close()
        End Using

        System.Console.ReadLine()
End Sub

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