AcquirePage Event

Summary

Occurs for each page acquired from the currently selected TWAIN source using the Acquire method.

Syntax

C++/CLI

Python

public event EventHandler<TwainAcquirePageEventArgs> AcquirePage

public: 
event EventHandler<TwainAcquirePageEventArgs^>^ AcquirePage

def AcquirePage(sender,e): # sender: TwainSession e: TwainAcquirePageEventArgs

Event Data

The event handler receives an argument of type TwainAcquirePageEventArgs containing data related to this event. The following TwainAcquirePageEventArgs properties provide information specific to this event.

Property	Description
Cancel	Set to true to abort the acquire operation.
Image	Gets the IRasterImage which holds the image data acquired from the TWAIN Data Source.

Remarks

If the user acquired several pages at the same time, a separate event occurs for each page. The GetInformation method can only be called within this event. For more information, refer to How to Acquire from the Twain Source.

Example

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:\LEADTOOLS22\Resources\Images"; 
}