SetJpegCompression Method

Sets the JPEG compression options for the current TWAIN session. This method lets the user set JPEG compression options for the current TWAIN session or reset the default JPEG compression options for the current TWAIN session, depending on the flag passed to the flag parameter.

Syntax

C#
Visual Basic
Java
Objective-C
C++

public void SetJpegCompression( 
   TwainJpegCompression compression,
   bool resetValues
)

'Declaration

Public Sub SetJpegCompression( _
   ByVal compression As TwainJpegCompression, _
   ByVal resetValues As Boolean _
)

'Usage

Dim instance As TwainSession
Dim compression As TwainJpegCompression
Dim resetValues As Boolean
 
instance.SetJpegCompression(compression, resetValues)

public:
void SetJpegCompression( 
   TwainJpegCompression compression,
   bool resetValues
)

Parameters

compression: JPEG Compression data to be set
resetValues: Indicates the JPEG compression values to set

Remarks

Depending upon the flag used, this method will either set JPEG compression options for the current TWAIN session, or restore the default JPEG compression options for the current TWAIN session.
For more information, refer to Using JPEG Compression For A TWAIN Source.

Example

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Twain

Public Sub SetJpegCompressionExample(ByVal parent As IntPtr)
   Dim session As TwainSession = New TwainSession()
   session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None)
   Try
      Dim myJpeg As TwainJpegCompression = session.GetJpegCompression(False)
      Dim data As TwainMemoryData() = New TwainMemoryData(0) {}

      myJpeg.ColorScheme = TwainColorScheme.Gray
      myJpeg.SubSampling = &H10001000
      myJpeg.ColorComponentCount = 1
      myJpeg.RestartFrequency = 0

      Dim quantMap As Integer() = New Integer(0) {}
      quantMap(0) = 0
      myJpeg.SetQuantizationMap(quantMap)

      Dim haffmanMap As Integer() = New Integer(0) {}
      haffmanMap(0) = 0
      myJpeg.SetHuffmanMap(haffmanMap)
      myJpeg.SetQuantizationTable(data)
      myJpeg.SetHuffmanDC(data)
      myJpeg.SetHuffmanAC(data)

      session.SetJpegCompression(myJpeg, False)
      MessageBox.Show("Set JPEG compression options is success")
   Catch ex As Exception
      MessageBox.Show(ex.Message)
   End Try

   session.Shutdown()
End Sub

using Leadtools;
using Leadtools.Twain;

public void SetJpegCompressionExample(IntPtr parent)
{
   TwainSession session = new TwainSession();
   session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);
   try
   {
      TwainJpegCompression myJpeg = session.GetJpegCompression(false);
      TwainMemoryData[] data = new TwainMemoryData[1];

      myJpeg.ColorScheme = TwainColorScheme.Gray;
      myJpeg.SubSampling = 0x10001000;
      myJpeg.ColorComponentCount = 1;
      myJpeg.RestartFrequency = 0;

      int[] quantMap = new int[1];
      quantMap[0] = 0;
      myJpeg.SetQuantizationMap(quantMap);

      int[] haffmanMap = new int[1];
      haffmanMap[0] = 0;
      myJpeg.SetHuffmanMap(haffmanMap);
      myJpeg.SetQuantizationTable(data);
      myJpeg.SetHuffmanDC(data);
      myJpeg.SetHuffmanAC(data);

      session.SetJpegCompression(myJpeg, false);
      MessageBox.Show("Set JPEG compression options is success");
   }
   catch (Exception ex)
   {
      MessageBox.Show(ex.Message);
   }

   session.Shutdown();
}

Requirements

Target Platforms

Reference

TwainSession Class
TwainSession Members
GetJpegCompression Method