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SetJpegCompression Method

Summary

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++

public void SetJpegCompression( 
   TwainJpegCompression compression, 
   bool resetValues 
)

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

public: 
void SetJpegCompression(  
   Leadtools.Twain.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

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(); 
}

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

Requirements

Target Platforms

Reference

TwainSession Class

TwainSession Members

GetJpegCompression Method

Help Version 19.0.2017.10.27

Leadtools.Twain Assembly

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Leadtools.Twain Namespace

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