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Leadtools TWAIN (Leadtools.Twain assembly)
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AcquireFast Method






Leadtools.Twain Namespace > TwainSession Class : AcquireFast Method
The base name of the image file(s) to which to save the acquired data.
Flag that indicates whether to display the manufacturer's user interface.
The transfer mode used to acquire
The image format used to acquire
represents the BitsPerPixel used to acquire
true for multi-page acquire, false for single page.
Specifies the buffer size (in bytes) used to acquire images.
Specifies whether to use the preferred buffer size specified by the TWAIN driver. true to use the preferred buffer size, false to use the user-defined buffer size (bufferSize parameter).
(Document/Medical only) Acquires one or more images from a TWAIN source and stores the images in the specified file(s).
Syntax
'Declaration
 

Public Sub AcquireFast( _
   ByVal baseFileName As String, _
   ByVal flags As TwainFastUserInterfaceFlags, _
   ByVal transferMode As TwainTransferMode, _
   ByVal format As RasterImageFormat, _
   ByVal bitsPerPixel As Integer, _
   ByVal multiPage As Boolean, _
   ByVal bufferSize As Integer, _
   ByVal usePreferredBufferSize As Boolean _
) 
'Usage
 

Dim instance As TwainSession
Dim baseFileName As String
Dim flags As TwainFastUserInterfaceFlags
Dim transferMode As TwainTransferMode
Dim format As RasterImageFormat
Dim bitsPerPixel As Integer
Dim multiPage As Boolean
Dim bufferSize As Integer
Dim usePreferredBufferSize As Boolean
 
instance.AcquireFast(baseFileName, flags, transferMode, format, bitsPerPixel, multiPage, bufferSize, usePreferredBufferSize)

Parameters

baseFileName
The base name of the image file(s) to which to save the acquired data.
flags
Flag that indicates whether to display the manufacturer's user interface.
transferMode
The transfer mode used to acquire
format
The image format used to acquire
bitsPerPixel
represents the BitsPerPixel used to acquire
multiPage
true for multi-page acquire, false for single page.
bufferSize
Specifies the buffer size (in bytes) used to acquire images.
usePreferredBufferSize
Specifies whether to use the preferred buffer size specified by the TWAIN driver. true to use the preferred buffer size, false to use the user-defined buffer size (bufferSize parameter).
Remarks
Use the Acquire method to acquire one or more images.
Use the AcquireFast method to acquire one or more images and save them to one or more files.
Based on the scanner type, this method will determine the best/fastest scanning method to use. This scanning method will be used when actually scanning the images.
Before calling this method: You can call the FindFastConfiguration method to determine the best scan configuration. Note:If you do not call the FindFastConfiguration method before calling the AcquireFast method, then the AcquireFast method will determine the best scanning method.
If the file format set in the format parameter does not support multi-page files, this method will ignore the multiPage parameter and automatically save the scanned images to separate files. The files are named by appending numbers to the string used for the baseFileName. For example, if the string in baseFileName is "Temp.jpg", the method will append the number of the image, 0001, 0002, etc., to the name of the file. Therefore, the output file names will be "Temp0001.jpg", "Temp0002.jpg", etc.
If the file format specified in the format parameter supports multi-page files, this method will use the multiPage parameter to determine how to save multiple images. If multi is set to false, each scanned page will be saved to a separate file, named in the same manner described in the paragraph above. If multiPage is set to true, the name of the output file will be the exact string in baseFileName (Temp.jpg) and it will be saved as a multi-page file.
To use the AcquireMultiPage event, you should set the EnableAcquireMultiPageEvent property value to true before calling the AcquireFast method. The AcquireMultiPage event will be fired twice for each scanned page. The event is fired the first time when the TWAIN source begins scanning the page. The event is fired the second time when the TWAIN source has finished scanning the page. For more information, refer to How to Acquire from the Twain Source.
For more information, refer to Fast TWAIN (Scan Configurations).
Example
Copy Code   
Imports Leadtools
Imports Leadtools.Twain

Public Sub twain_AcquireMulti(ByVal sender As Object, ByVal e As TwainAcquireMultiPageEventArgs)
   Dim msg As String
   If e.FinishScan Then
      msg = String.Format("The page # {0} is scanned and saved to file name {1}", e.PageNumber, e.FileName)
      MessageBox.Show(msg)
   End If

   e.Cancel = False
End Sub


Public Sub AcquireFastExample(ByVal parent As IntPtr)
   Dim session As TwainSession = New TwainSession()
   session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None)

   session.EnableAcquireMultiPageEvent = True
   AddHandler session.AcquireMultiPage, AddressOf twain_AcquireMulti

   session.AcquireFast(Path.Combine(LEAD_VARS.ImagesDir, "test.tif"), TwainFastUserInterfaceFlags.Show, TwainTransferMode.Buffer, RasterImageFormat.Tif, 1, True, 0, True)
   session.Shutdown()
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Twain;

public void twain_AcquireMulti(object sender, TwainAcquireMultiPageEventArgs e)
{
   string msg;
   if (e.FinishScan)
   {
      msg = String.Format("The page # {0} is scanned and saved to file name {1}", e.PageNumber, e.FileName);
      MessageBox.Show(msg);
   }

   e.Cancel = false;
}

public void AcquireFastExample(IntPtr parent)
{
   TwainSession session = new TwainSession();
   session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);

   session.EnableAcquireMultiPageEvent = true;
   session.AcquireMultiPage += new  EventHandler<TwainAcquireMultiPageEventArgs>(twain_AcquireMulti);

   session.AcquireFast(Path.Combine(LEAD_VARS.ImagesDir, "Out_test.tif"),
                       TwainFastUserInterfaceFlags.Show,
                       TwainTransferMode.Buffer,
                       RasterImageFormat.Tif, 1, true, 0, true);
   session.Shutdown();
}

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

Target Platforms

See Also

Reference

TwainSession Class
TwainSession Members
Startup Method
Shutdown Method
Leadtools.Twain.TwainSession.AcquireMultiPage
FindFastConfiguration Method
EnableAcquireMultiPageEvent Property

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