Gets the current or default JPEG compression settings for the TWAIN session.
Syntax
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 Basic | Copy Code |
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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 |
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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
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