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StopFeeder Method
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Leadtools.Twain Namespace > TwainSession Class : StopFeeder Method




Stop acquiring images only from the feeder of the TWAIN source.

Syntax

Visual Basic (Declaration) 
Public Sub StopFeeder()
Visual Basic (Usage)Copy Code
Dim instance As TwainSession
 
instance.StopFeeder()
C# 
public void StopFeeder()
Managed Extensions for C++ 
public: void StopFeeder();
C++/CLI 
public:
void StopFeeder();

Example

Visual BasicCopy Code
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, "LEAD Technologies, Inc.", "LEAD Twain .NET", "Version 14", "LEADTools Twain test sample", TwainStartupFlags.None)

   acq_session.SelectSource(String.Empty)

   Dim props As TwainProperties = acq_session.Properties
   Dim dataProps As TwainDataTransferProperties = props.DataTransfer
   dataProps.FileName = "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\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
C#Copy Code
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, "LEAD Technologies, Inc.", "LEAD Twain .NET", "Version 14", "LEADTools Twain test sample", TwainStartupFlags.None); 
 
   acq_session.SelectSource(String.Empty); 
 
   TwainProperties props = acq_session.Properties; 
   TwainDataTransferProperties dataProps = props.DataTransfer; 
   dataProps.FileName = @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\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(); 
}

Remarks

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 AcquirePage event when it is fired.

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

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

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also