How to acquire an image area from SANE scanner?

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If you want to acquire an image area (not the whole image) from SANE scanner, you should set the scan area using SaneLocalDevice.ScanArea property.

Here is an example that demonstrates how to acquire an image area from SANE device:

/// <summary>
/// Acquires image area from SANE device.
/// </summary>
public void AcquireImageAreaFromSaneDevice()
{
    // 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();


        // get the default scan area
        VintasoftRectF defaultScanArea = device.ScanArea;
        // set new scan area
        device.ScanArea = new VintasoftRectF(0, 0, defaultScanArea.Width, defaultScanArea.Height / 2);


        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 image area from SANE device.
''' </summary>
Public Sub AcquireImageAreaFromSaneDevice()
        ' 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()


                ' get the default scan area
                Dim defaultScanArea As VintasoftRectF = device.ScanArea
                ' set new scan area
                device.ScanArea = New VintasoftRectF(0, 0, defaultScanArea.Width, defaultScanArea.Height / 2)


                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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