StopFeeder Method

Summary

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

Syntax
C#
VB
C++
public void StopFeeder() 
Public Sub StopFeeder()  
public: 
void StopFeeder();  

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.

Example
C#
VB
using Leadtools; 
using Leadtools.Twain; 
 
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(IntPtr 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"; 
} 
Imports Leadtools 
Imports Leadtools.Twain 
 
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 IntPtr) 
   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 

Requirements

Target Platforms

Help Version 20.0.2019.9.19
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Leadtools.Twain Assembly