VintaSoft Twain .NET SDK 15.0: Documentation for .NET developer
In This Topic
    Acquire images from SANE scanner synchronously
    In This Topic
    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:
    1. Open SANE device manager.
    2. Open SANE device.
    3. Set the scanning settings.
    4. Start the acquisition modal loop.
    5. 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();
    }
    
    ''' <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