GetJpegCompression Method

C#
Visual Basic
Java
Objective-C
C++

public TwainJpegCompression GetJpegCompression( 
   bool defaultValues
)

'Declaration

Public Function GetJpegCompression( _
   ByVal defaultValues As Boolean _
) As TwainJpegCompression

'Usage

Dim instance As TwainSession
Dim defaultValues As Boolean
Dim value As TwainJpegCompression
 
value = instance.GetJpegCompression(defaultValues)

public:
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.

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.

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

Copy Code

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

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();
}

Target Platforms

Reference

TwainSession Class
TwainSession Members
SetJpegCompression Method