ExtractMessageCommand Class

C#
Visual Basic
WinRT C#
Objective-C
Java
WinRT JavaScript
C++

public class ExtractMessageCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration
 
Public Class ExtractMessageCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As ExtractMessageCommand

public sealed class ExtractMessageCommand : Leadtools.ImageProcessing.IRasterCommand

function Leadtools.ImageProcessing.Effects.ExtractMessageCommand()

public ref class ExtractMessageCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

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.

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

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Effects

Public Sub ExtractMessageCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "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 LeadPoint(0, 0)
   command.Directory = LEAD_VARS.ImagesDir

   ' Extract the message from the image in the default position and with the default password.
   command.Run(leadImage)
   codecs.Save(leadImage, Path.Combine(LEAD_VARS.ImagesDir, "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

End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Effects;

public void ExtractMessageCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;

   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"));

   // Prepare the command
   AddMessageCommand addmessageCommand = new AddMessageCommand();
   addmessageCommand.Password = null;
   addmessageCommand.Start = new LeadPoint(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 LeadPoint(0, 0);
   command.Directory   = Path.Combine(LEAD_VARS.ImagesDir, "");

   // Extract the message from the image in the default position and with the default password.
   command.Run(image);
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "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");


}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Target Platforms

Reference

ExtractMessageCommand Members
Leadtools.ImageProcessing.Effects Namespace
AddMessageCommand Class