''' <summary>
''' Synchronously acquire images as PDF stream from eSCL device.
''' </summary>
Public Sub SynchronouslyAcquireImagesAsPdfStreamFromEsclDevice()
    ' create eSCL device manager
    Using deviceManager As New Vintasoft.EsclImageScanning.EsclDeviceManager()
        ' open eSCL device manager
        deviceManager.Open()

        ' wait while the eSCL device manager searches for eSCL devices
        System.Threading.Thread.Sleep(deviceManager.DeviceSearchTimeout)
        ' get count of eSCL 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 eSCL device
        Dim device As Vintasoft.EsclImageScanning.EsclDevice = deviceManager.Devices(0)

        ' open eSCL device
        device.Open()

        Dim imageIndex As Integer = 0
        Dim acquiredImageBytes As Byte() = Nothing
        Do
            Try
                ' acquire image as PDF stream from eSCL device
                acquiredImageBytes = device.AcquireImageSyncAsFileStream(Vintasoft.EsclImageScanning.EsclScanDocumentFormat.PDF)
                ' if image is received
                If acquiredImageBytes IsNot Nothing Then
                    imageIndex += 1
                    Dim filename As String = String.Format("scannedImage-{0}.pdf", imageIndex)
                    If System.IO.File.Exists(filename) Then
                        System.IO.File.Delete(filename)
                    End If

                    System.IO.File.WriteAllBytes(filename, acquiredImageBytes)

                    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 image is acquired
        Loop While acquiredImageBytes IsNot Nothing

        ' close eSCL device
        device.Close()

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

    System.Console.ReadLine()
End Sub

/// <summary>
/// Synchronously acquire images as PDF stream from eSCL device.
/// </summary>
public void SynchronouslyAcquireImagesAsPdfStreamFromEsclDevice()
{
    // create eSCL device manager
    using (Vintasoft.EsclImageScanning.EsclDeviceManager deviceManager = new Vintasoft.EsclImageScanning.EsclDeviceManager())
    {
        // open eSCL device manager
        deviceManager.Open();

        // wait while the eSCL device manager searches for eSCL devices
        System.Threading.Thread.Sleep(deviceManager.DeviceSearchTimeout);
        // get count of eSCL devices
        int deviceCount = deviceManager.Devices.Count;
        if (deviceCount == 0)
        {
            System.Console.WriteLine("Devices are not found.");
            return;
        }

        // select the first eSCL device
        Vintasoft.EsclImageScanning.EsclDevice device = deviceManager.Devices[0];

        // open eSCL device
        device.Open();

        int imageIndex = 0;
        byte[] acquiredImageBytes = null;
        do
        {
            try
            {
                // acquire image as PDF stream from eSCL device
                acquiredImageBytes = device.AcquireImageSyncAsFileStream(Vintasoft.EsclImageScanning.EsclScanDocumentFormat.PDF);
                // if image is received
                if (acquiredImageBytes != null)
                {
                    imageIndex++;
                    string filename = string.Format("scannedImage-{0}.pdf", imageIndex);
                    if (System.IO.File.Exists(filename))
                        System.IO.File.Delete(filename);

                    System.IO.File.WriteAllBytes(filename, acquiredImageBytes);

                    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 image is acquired
        while (acquiredImageBytes != null);

        // close eSCL device
        device.Close();

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

    System.Console.ReadLine();
}