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GetJpegCompression Method
See Also  Example
Leadtools.Twain Namespace > TwainSession Class : GetJpegCompression Method



defaultValues
Flag that indicates whether to get the current or the default compression settings.
defaultValues
Flag that indicates whether to get the current or the default compression settings.
Gets the current or default JPEG compression settings for the TWAIN session.

Syntax

Visual Basic (Declaration) 
Public Function GetJpegCompression( _
   ByVal defaultValues As Boolean _
) As TwainJpegCompression
Visual Basic (Usage)Copy Code
Dim instance As TwainSession
Dim defaultValues As Boolean
Dim value As TwainJpegCompression
 
value = instance.GetJpegCompression(defaultValues)
C# 
public TwainJpegCompression GetJpegCompression( 
   bool defaultValues
)
C++/CLI 
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.

Example

Visual BasicCopy Code
Public Sub GetJpegCompressionExample(ByVal parent As IWin32Window)
   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
C#Copy Code
public void GetJpegCompressionExample(IWin32Window 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(); 
}

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.

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also