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ExtractMessageCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing.Effects Namespace : ExtractMessageCommand Class




Extracts a message (text or file) from the image, if the image has an embedded message. This command is available in the Document/Medical Toolkits.

Syntax

Visual Basic (Declaration) 
Public Class ExtractMessageCommand 
   Inherits RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As ExtractMessageCommand
C# 
public class ExtractMessageCommand : RasterCommand, IRasterCommand 
Managed Extensions for C++ 
public __gc class ExtractMessageCommand : public RasterCommand, IRasterCommand 
C++/CLI 
public ref class ExtractMessageCommand : public RasterCommand, IRasterCommand 

Example

Visual BasicCopy Code
ImageProcessing.Effects.ExtractMessageCommand
   Public Sub ExtractMessageCommandExample()
      RasterCodecs.Startup()
      Dim codecs As New RasterCodecs()
      codecs.ThrowExceptionsOnInvalidImages = True

      Dim leadImage As RasterImage = codecs.Load("C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Master.jpg")

      Dim addmessagecommand As AddMessageCommand = New AddMessageCommand
      addmessagecommand.Message = "LEAD Technologies, Inc."
      ' Add the above message to image in the default position and with the default password.
      addmessagecommand.Run(leadImage)
      ' Prepare the command

      Dim command As ExtractMessageCommand = New ExtractMessageCommand

      ' set password and start properties values same as AddMessageCommand values.
      command.Password = Nothing
      command.Start = New Point(0, 0)
      command.Directory = "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\"

      ' Extract the message from the image in the default position and with the default password.
      command.Run(leadImage)
      codecs.Save(leadImage, "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Result.jpg", RasterImageFormat.Jpeg, 24)


      If (Not (IsNothing(command.Message))) Then
         MessageBox.Show(command.Message, "Extracted Message")
      ElseIf (Not (IsNothing(command.FileName))) Then
         MessageBox.Show(command.FileName, "Extracted File")
      End If

      RasterCodecs.Shutdown()
   End Sub
C#Copy Code
ImageProcessing.Effects.ExtractMessageCommand 
      public void ExtractMessageCommandExample() 
      { 
         // Load an image 
         RasterCodecs.Startup(); 
         RasterCodecs codecs = new RasterCodecs(); 
         codecs.ThrowExceptionsOnInvalidImages = true; 
 
         RasterImage image = codecs.Load(@"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Result.jpg"); 
 
         // Prepare the command 
         AddMessageCommand addmessageCommand = new AddMessageCommand(); 
         addmessageCommand.Password = null; 
         addmessageCommand.Start = new Point(0, 0); 
         addmessageCommand.Message = "LEAD Technologies, Inc."; 
         // Add the above message to image in the default position and with the default password. 
         addmessageCommand.Run(image); 
 
         // Prepare the command 
         ExtractMessageCommand command = new ExtractMessageCommand(); 
 
         // set password and start properties values same as AddMessageCommand values. 
         command.Password    = null; 
         command.Start       = new Point(0,0); 
         command.Directory   = @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\"; 
 
         // Extract the message from the image in the default position and with the default password. 
         command.Run(image); 
         codecs.Save(image, @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Result.jpg", RasterImageFormat.Jpeg, 24); 
 
         if(command.Message != null && command.Message.Length != 0) 
            MessageBox.Show(command.Message, "Extracted Message"); 
         else  if (command.FileName != null && command.FileName.Length != 0) 
            MessageBox.Show(command.FileName, "Extracted File"); 
 
 
         RasterCodecs.Shutdown(); 
      }

Remarks

  • This command is used to extract the message that was added to the image by the AddMessageCommand.
  • Before calling this command, set the password, the starting point, and the directory using the same information used for these when the message was added.
  • This command can extract a message from any type of lossless image format such as bmp, tiff, lossless jpeg, and so forth. If used with lossy format types the message may be corrupted or lost.
  • This method supports 24- and 48-bits images, and 8- and 16-bits grayscale images.
  • Support for 16-bit grayscale and 48-bit color images is available only in the Document/Medical toolkits.
  • This command does not support 32-bit grayscale images.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Effects.ExtractMessageCommand

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