Acquire Method

Summary
Acquires one or more images from a TWAIN source.
Syntax
C#
C++
public DialogResult Acquire( 
   TwainUserInterfaceFlags flags 
) 
vb[VB Syntax] 
Public Function Acquire( _ 
   ByVal _flags_ As TwainUserInterfaceFlags _ 
) As DialogResult 
public: 
DialogResult Acquire(  
   TwainUserInterfaceFlags flags 
)  

Parameters

flags
Indicates whether to display the manufacturer's user interface.

Return Value

One of the DialogResult values. If an error occurs, an exception is thrown.

Remarks

Use the Acquire method to acquire one or more images. Use the AcquireFast or AcquireFast2 method to acquire one or more images and save them to one or more files.

The number of pages to acquire can be determined by getting the TWAIN source's capabilities. To change the number of pages to acquire, set the appropriate capability to the desired number. Acquire will get images from the selected TWAIN source and pass them into an RasterImage object to the AcquirePage event through the TwainAcquirePageEventArgs class. For each image acquired by the currently selected TWAIN source, an AcquirePage event is generated.

The Acquire method acquires pages in the following transfer modes:

  • Native - gets the images being scanned into the memory as a whole.
  • Memory Buffered - gets images from the source as strips of data. These strips can be merged to get the whole image.

To set the transfer mode, call SetCapability with the appropriate capability constant. For more information, refer to How to Acquire from the Twain Source.

Example
C#
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"; 
} 
Requirements

Target Platforms

Help Version 22.0.2022.4.5
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© 1991-2022 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Twain Assembly

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2022 LEAD Technologies, Inc. All Rights Reserved.