StopFeeder Method

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public void StopFeeder()

'Declaration
 
Public Sub StopFeeder()

'Usage
 
Dim instance As TwainSession
 
instance.StopFeeder()

public void StopFeeder()

 function Leadtools.Twain.TwainSession.StopFeeder()

public:
void StopFeeder();

This method stops the process of acquiring images using one of the following methods:

Acquire

AcquireToImage

AcquireFast

In order to stop acquiring images with the Acquire or AcquireToImage, call this method in the Leadtools.Twain.TwainSession.AcquirePage event when it is fired.

In order to stop acquire images by calling the AcquireFast, call this method in the Leadtools.Twain.TwainSession.AcquireMultiPage event when it is fired.

If the TWAIN source has no feeder, then this method will fail and an exception is thrown.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Dim acq_session As TwainSession
   Private Sub twain_AcquirePage(ByVal sender As Object, ByVal e As TwainAcquirePageEventArgs)
      ' get acquired image here

      ' call StopFeeder method here if you need to stop the feeder
      acq_session.StopFeeder()
   End Sub

   Public Sub AcquireExample(ByVal parent As IWin32Window)
      acq_session = New TwainSession()
      acq_session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None)

      acq_session.SelectSource(String.Empty)

      Dim props As TwainProperties = acq_session.Properties
      Dim dataProps As TwainDataTransferProperties = props.DataTransfer
      dataProps.FileName = Path.Combine(LEAD_VARS.ImagesDir, "twain.bmp")
      dataProps.MemoryBufferSize = dataProps.MemoryBufferSize * 2
      props.DataTransfer = dataProps
      acq_session.Properties = props
      Dim opts As TwainTransferOptions = acq_session.TransferOptions

      AddHandler acq_session.AcquirePage, AddressOf twain_AcquirePage

      If acq_session.Acquire(TwainUserInterfaceFlags.Show) <> DialogResult.OK Then
         MessageBox.Show("Error Acquiring From Source")
      End If

      acq_session.Shutdown()
   End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

TwainSession acq_session;
   private void twain_AcquirePage(object sender, TwainAcquirePageEventArgs e)
   {
      // get acquired image here

      // call StopFeeder method here if you need to stop the feeder
      acq_session.StopFeeder();
   }

   public void AcquireExample(IWin32Window parent)
   {
      acq_session = new TwainSession();
      acq_session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);

      acq_session.SelectSource(String.Empty);

      TwainProperties props = acq_session.Properties;
      TwainDataTransferProperties dataProps = props.DataTransfer;
      dataProps.FileName = Path.Combine(LEAD_VARS.ImagesDir, "twain.bmp");
      dataProps.MemoryBufferSize = dataProps.MemoryBufferSize * 2;
      props.DataTransfer = dataProps;
      acq_session.Properties = props;
      TwainTransferOptions opts = acq_session.TransferOptions;

      acq_session.AcquirePage += new EventHandler<TwainAcquirePageEventArgs>(twain_AcquirePage);

      if (acq_session.Acquire(TwainUserInterfaceFlags.Show) != DialogResult.OK)
         MessageBox.Show("Error Acquiring From Source");

      acq_session.Shutdown();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

TwainSession Class
TwainSession Members
Acquire Method
AcquireFast Method