GetJpegCompression Method

Summary

Gets the current or default JPEG compression settings for the TWAIN session.

Syntax

C#
VB
C++
public TwainJpegCompression GetJpegCompression( 
   bool defaultValues 
) 
Public Function GetJpegCompression( _ 
   ByVal defaultValues As Boolean _ 
) As Leadtools.Twain.TwainJpegCompression 
public: 
Leadtools.Twain.TwainJpegCompression GetJpegCompression(  
   bool defaultValues 
)  

Parameters

defaultValues
Flag that indicates whether to get the current or the default compression settings.

Return Value

A TwainJpegCompression object that contains the specified TWAIN JPEG compression options.

Remarks

This method will get the current or default TWAIN JPEG compression settings, depending on the flag passed to the flag parameter. For more information, refer to Using JPEG Compression For A TWAIN Source.

Example

C#
VB
using Leadtools; 
using Leadtools.Twain; 
 
public void GetJpegCompressionExample(IntPtr parent) 
{ 
   TwainSession session = new TwainSession(); 
   session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None); 
 
   string jpegdata; 
   try 
   { 
      TwainJpegCompression twainJpeg = session.GetJpegCompression(false); 
      int[] quantMap = twainJpeg.GetQuantizationMap(); 
      int[] haffmanMap = twainJpeg.GetHuffmanMap(); 
      TwainMemoryData[] quantTable = twainJpeg.GetQuantizationTable(); 
      TwainMemoryData[] haffmanDC = twainJpeg.GetHuffmanDC(); 
      TwainMemoryData[] haffmanAC = twainJpeg.GetHuffmanAC(); 
 
      jpegdata = String.Format(@"Color Space = {0}\nQuantMap = {1}\nGetHuffmanMap = {2}\nGetQuantTable Flags = {3}\nGetQuantTable Length = {4}\nGetQuantTable Data = {5}\nGetHuffmanDC Flags = {6}\nGetHuffmanDC Data 
            = {7}\nGetHuffmanAC Flags = {8}\nGetHuffmanAC Data = {9}\n", 
                               twainJpeg.ColorScheme, 
                               quantMap[0], 
                               haffmanMap[0], 
                               quantTable[0].Flags, 
                               quantTable[0].Length, 
                               quantTable[0].Data, 
                               haffmanDC[0].Flags, 
                               haffmanDC[0].Data, 
                               haffmanAC[0].Flags, 
                               haffmanAC[0].Data); 
 
      MessageBox.Show(jpegdata); 
   } 
   catch (Exception ex) 
   { 
      MessageBox.Show(ex.Message); 
   } 
 
   session.Shutdown(); 
} 
Imports Leadtools 
Imports Leadtools.Twain 
 
Public Sub GetJpegCompressionExample(ByVal parent As IntPtr) 
   Dim session As TwainSession = New TwainSession() 
   session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None) 
 
   Dim jpegdata As String 
   Try 
      Dim twainJpeg As TwainJpegCompression = session.GetJpegCompression(False) 
      Dim quantMap As Integer() = twainJpeg.GetQuantizationMap() 
      Dim haffmanMap As Integer() = twainJpeg.GetHuffmanMap() 
      Dim quantTable As TwainMemoryData() = twainJpeg.GetQuantizationTable() 
      Dim haffmanDC As TwainMemoryData() = twainJpeg.GetHuffmanDC() 
      Dim haffmanAC As TwainMemoryData() = twainJpeg.GetHuffmanAC() 
 
      jpegdata = String.Format("Color Space = {0}" & Constants.vbLf & "QuantMap = {1}" & Constants.vbLf & "GetHuffmanMap = {2}" & Constants.vbLf & "GetQuantTable Flags = {3}" & Constants.vbLf & "GetQuantTable Length = {4}" & 
            Constants.vbLf & "GetQuantTable Data = {5}" & Constants.vbLf & "GetHuffmanDC Flags = {6}" & Constants.vbLf & "GetHuffmanDC Data = {7}" & Constants.vbLf & "GetHuffmanAC Flags = {8}" & Constants.vbLf & "GetHuffmanAC Data = {9}" & 
            Constants.vbLf, twainJpeg.ColorScheme, quantMap(0), haffmanMap(0), quantTable(0).Flags, quantTable(0).Length, quantTable(0).Data, haffmanDC(0).Flags, haffmanDC(0).Data, haffmanAC(0).Flags, haffmanAC(0).Data) 
 
      MessageBox.Show(jpegdata) 
   Catch ex As Exception 
      MessageBox.Show(ex.Message) 
   End Try 
 
   session.Shutdown() 
End Sub 

Requirements

Target Platforms

Help Version 19.0.2017.10.18
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Leadtools.Twain Assembly