HOWTO: Console Based Scanning in DotTwain

Scanning from the console is done similarly to scanning in a winforms app with a few exceptions:

1. There is no SelectSourceDialog, another method for selecting a scanner will need to be implemented
2. The program has to be prevented from continuing after acquire. This demo accomplishes this with the ModalAcquire property being set to true.

Below is the simplest version of console based scanning. To complete the demo, implement a way to select a device from the list of devices. (The simplest solution to this is “return devices[0]”)

C#

static void Main(string[] args)
{
    Acquisition acquisition = new Acquisition();
    AddEvents(acquisition);
    count = 0;
    DeviceCollection devices = acquisition.Devices;
    Device selected = SelectDevice(devices);
    selected.HideInterface = true;
    selected.ModalAcquire = true;
    Console.Out.WriteLine("---Beginning Scan---");
    selected.Acquire();
    Console.Out.WriteLine("---Ending Scan---\n Press Enter To Quit");
    Console.In.Peek();
}
 
private static void AddEvents(Acquisition acquisition)
{
    acquisition.ImageAcquired += new ImageAcquiredEventHandler(acquisition_ImageAcquired);
    acquisition.AcquireFinished +=new EventHandler(acquisition_AcquireFinished);
    acquisition.AcquireCanceled += new EventHandler(acquisition_AcquireCanceled);
        }
 
static void acquisition_AcquireCanceled(object sender, EventArgs e)
{
    Console.Out.WriteLine("Acqusition Canceled");
}
 
static void acquisition_AcquireFinished(object sender, EventArgs e)
{
    Console.Out.WriteLine("Acquisition Finished");
}
 
static int count;
static void acquisition_ImageAcquired(object sender, AcquireEventArgs e)
{
    string filename = "out"+ count++ +".tif";
    e.Image.Save(filename,ImageFormat.Tiff);
    Console.Out.WriteLine("Frame " + count +" Acquired. Saved At: "+filename);
}
 
private static Device SelectDevice(DeviceCollection devices)
{
      //TODO: Implement a Methodology for selecting a device
}

VB.NET

Private Shared Sub Main(ByVal args As String())
    Dim acquisition As New Acquisition()
    AddEvents(acquisition)
    count = 0
    Dim devices As DeviceCollection = acquisition.Devices
    Dim selected As Device = SelectDevice(devices)
    selected.HideInterface = True
    selected.ModalAcquire = True
    Console.Out.WriteLine("---Beginning Scan---")
    selected.Acquire()
    Console.Out.WriteLine("---Ending Scan---" & vbLf & " Press Enter To Quit")
    Console.[In].Peek()
End Sub
 
Private Shared Sub AddEvents(ByVal acquisition As Acquisition)
    AddHandler acquisition.ImageAcquired, AddressOf acquisition_ImageAcquired
    AddHandler acquisition.AcquireFinished, AddressOf acquisition_AcquireFinished
    AddHandler acquisition.AcquireCanceled, AddressOf acquisition_AcquireCanceled
End Sub
 
Private Shared Sub acquisition_AcquireCanceled(ByVal sender As Object, ByVal e As EventArgs)
    Console.Out.WriteLine("Acqusition Canceled")
End Sub
 
Private Shared Sub acquisition_AcquireFinished(ByVal sender As Object, ByVal e As EventArgs)
    Console.Out.WriteLine("Acquisition Finished")
End Sub
 
Shared count As Integer
Private Shared Sub acquisition_ImageAcquired(ByVal sender As Object, ByVal e As AcquireEventArgs)
    Dim filename As String = "out" & count & ".tif"
    count +=1 
    e.Image.Save(filename, ImageFormat.Tiff)
    Console.Out.WriteLine(("Frame " & count & " Acquired. Saved At: ") + filename)
End Sub
 
Private Shared Function SelectDevice(ByVal devices As DeviceCollection) As Device
      ‘TODO: CREATE METHODOLOGY FOR SELECTING DEVICE
End Function