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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.
public class ExtractMessageCommand : RasterCommand 
public ref class ExtractMessageCommand : public RasterCommand   
class ExtractMessageCommand(RasterCommand): 
  • 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-bit and 48-bits images, and 8-bit 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.

Run the ExtractMessageCommand on an image by loading an image that has an embedded message and extracts the message from it.

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. 
   // 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. 
   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:\LEADTOOLS23\Resources\Images"; 

Target Platforms

Help Version 23.0.2024.3.3
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Leadtools.ImageProcessing.Effects Assembly

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