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SetJpegCompression Method
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Leadtools.Twain Namespace > TwainSession Class : SetJpegCompression Method




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

Visual Basic (Declaration) 
Public Sub SetJpegCompression( _
   ByVal compression As TwainJpegCompression, _
   ByVal resetValues As Boolean _
)
Visual Basic (Usage)Copy Code
Dim instance As TwainSession
Dim compression As TwainJpegCompression
Dim resetValues As Boolean
 
instance.SetJpegCompression(compression, resetValues)
C# 
public void SetJpegCompression( 
   TwainJpegCompression compression,
   bool resetValues
)
Managed Extensions for C++ 
public: void SetJpegCompression( 
   TwainJpegCompression compression,
   bool resetValues
)
C++/CLI 
public:
void SetJpegCompression( 
   TwainJpegCompression compression,
   bool resetValues
)

Parameters

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

Example

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

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.

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