How to scan pages from the automatic document feeder (ADF) of SANE image scanner?

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If you want to scan pages from the automatic document feeder (ADF) of SANE image scanner, you should set the scan source that allows to get images from automatic document feeder. SDK allows to set the scan source of SANE device using SaneLocalDevice.ScanSource property.

SANE API does not provide standard names for scan sources, which allow to acquire images from automatic document feeder of SANE image scanner, and scanner vendors use different names for scan sources. For example, Canon uses names "ADF Front" and "ADF Duplex", Kodak uses names "ADF", "ADF Front", "ADF Back", "ADF Both", "ADF Duplex".

Names of supported scan sources can be obtained using SaneLocalDevice.GetSupportedScanSources method.

Here is an example that demonstrates how to acquire images from automatic document feeder of SANE device:

/// <summary>
/// Acquires images from the automatic document feeder (ADF) of SANE device.
/// </summary>
public void AcquireImagesFromDocumentFeederOfSaneDevice()
{
    // 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();


        string adfScanSource = "ADF";
        // get names of supported scan sources
        string[] supportedScanSources = device.GetSupportedScanSources();
        foreach (string supportedScanSource in supportedScanSources)
        {
            if (supportedScanSource.StartsWith("ADF"))
            {
                adfScanSource = supportedScanSource;
                break;
            }
        }

        // specify that images must be acquired from automatic document feeder of SANE device
        device.ScanSource = adfScanSource;


        Vintasoft.Sane.SaneAcquiredImage acquiredImage;
        do
        {
            try
            {
                // acquire image from SANE device
                acquiredImage = device.AcquireImageSync();
                // if image is received
                if (acquiredImage != null)
                {
                    System.Console.WriteLine("Image is acquired.");
                }
                // 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>
''' Acquires images from the automatic document feeder (ADF) of SANE device.
''' </summary>
Public Sub AcquireImagesFromDocumentFeederOfSaneDevice()
    ' 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 adfScanSource As String = "ADF"
        ' get names of supported scan sources
        Dim supportedScanSources As String() = device.GetSupportedScanSources()
        For Each supportedScanSource As String In supportedScanSources
            If supportedScanSource.StartsWith("ADF") Then
                adfScanSource = supportedScanSource
                Exit For
            End If
        Next

        ' specify that images must be acquired from automatic document feeder of SANE device
        device.ScanSource = adfScanSource


        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
                    System.Console.WriteLine("Image is acquired.")
                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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