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LEADTOOLS (Leadtools assembly)
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Comments Property








Leadtools Namespace > RasterImage Class : Comments Property
The collection of comment data used when reading and writing certain file formats (including GIF).
Syntax
'Declaration
 

Public ReadOnly Property Comments As RasterCollection(Of RasterCommentMetadata)
'Usage
 

Dim instance As RasterImage
Dim value As RasterCollection(Of RasterCommentMetadata)
 
value = instance.Comments
@property (nonatomic, assign, readonly, nullable) NSMutableArray<LTRasterCommentMetadata *> *comments
public RasterCollection<RasterCommentMetadata> getComments()
 get_Comments();

Property Value

A collection of RasterCommentMetadata used when reading and writing certain file formats (including GIF).
Remarks

Several formats allow you to store non-image data such as comments, tags, and markers.

You can manipulate the comments of an image by adding/removing RasterCommentMetadata objects to this collection.

By setting the CodecsSaveOptions.Comments property to true before calling RasterCodecs.Save, you can save the comments in this collection when the image is saved into a file.

By setting the CodecsLoadOptions.Markers property to true before calling RasterCodecs.Load, you can load all the markers (if any) into this collection when an image is loaded from a file.

You can use the RasterCodecs.WriteMarkers method to save the markers directly to an existing file.

For more information, refer to Non Image Data and Types of File Comments.

Example
Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg

Private Sub DisplayComment(ByVal comment As RasterCommentMetadata)
   Select Case comment.DataType
      Case RasterCommentMetadataDataType.Ascii
         MessageBox.Show("Comment of type " & comment.Type.ToString() & " = " & comment.ToAscii())
   End Select
End Sub
      
Public Sub CommentsExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP"))
   'Ascii
   Dim commentDataAscii As RasterCommentMetadata = New RasterCommentMetadata()
   ' set the artist comment
   commentDataAscii.Type = RasterCommentMetadataType.Artist
   commentDataAscii.FromAscii("Test String")
   image.Comments.Add(commentDataAscii)

   codecs.Options.Save.Comments = True
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_COMMENTS.TIF"), RasterImageFormat.Tif, 0)
   ' load the comment together with the image

   Dim comment As RasterCommentMetadata = codecs.ReadComment(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_COMMENTS.TIF"), 1, _
                                                             RasterCommentMetadataType.Artist)
   DisplayComment(comment)

   codecs.Dispose()
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;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using Leadtools.Svg;

private void DisplayComment(RasterCommentMetadata comment)
{
   switch(comment.DataType)
   {
      case RasterCommentMetadataDataType.Ascii:
         MessageBox.Show("Comment of type " + comment.Type.ToString() + " = " + comment.ToAscii());
         break;
   }
}
      
public void CommentsExample()
{
   RasterCodecs codecs = new RasterCodecs();
   RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path, "IMAGE1.CMP"));
   //Ascii
   RasterCommentMetadata commentDataAscii = new RasterCommentMetadata();
   // set the artist comment
   commentDataAscii.Type = RasterCommentMetadataType.Artist;
   commentDataAscii.FromAscii("Test String");
   image.Comments.Add(commentDataAscii);

   codecs.Options.Save.Comments = true;
   codecs.Save(image,Path.Combine(ImagesPath.Path, "IMAGE1_COMMENTS.TIF"), RasterImageFormat.Tif, 0);
   // load the comment together with the image

   RasterCommentMetadata comment = codecs.ReadComment(Path.Combine(ImagesPath.Path, "IMAGE1_COMMENTS.TIF"), 1, RasterCommentMetadataType.Artist);
   DisplayComment(comment);

   codecs.Dispose();
}
function DisplayComment(comment)
{
   switch (comment.dataType)
   {
      case Leadtools.RasterCommentMetadataDataType.ascii:
         console.info("Comment of type " + comment.type.toString() + " = " + comment.toAscii());
         break;
   }
}


RasterImageExamples.prototype.CommentsExample = function () {
   Tools.SetLicense();
   with (Leadtools) {
      with (Leadtools.Codecs) {
         var codecs = new RasterCodecs();
         var srcFileName = "Assets\\Image1.cmp";
         var image;

         return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
            return codecs.loadAsync(LeadStreamFactory.create(loadFile))
         })
               .then(function (img) {
                  image = img;

                  //Ascii
                  var commentDataAscii = new RasterCommentMetadata();
                  // set the artist comment
                  commentDataAscii.type = RasterCommentMetadataType.artist;
                  commentDataAscii.fromAscii("Test String");
                  image.comments.append(commentDataAscii);

                  codecs.options.save.comments = true;
                  return Tools.AppLocalFolder().createFileAsync("IMAGE1_COMMENTS.TIF")
               })
               .then(function (saveFile) {
                  var saveStream = LeadStreamFactory.create(saveFile);
                  return codecs.saveAsync(image, saveStream, RasterImageFormat.tif, 0)
               })
               .then(function () {

                  // load the comment together with the image
                  return Tools.AppLocalFolder().getFileAsync("IMAGE1_COMMENTS.TIF")
               })
               .then(function (loadFile) {
                  return codecs.readCommentAsync(LeadStreamFactory.create(loadFile), 1, RasterCommentMetadataType.artist)
               })
               .then(function (comment) {
                  DisplayComment(comment);
                  image.close();
                  codecs.close();
               });
      }
   }
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;

private void DisplayComment(RasterCommentMetadata comment)
{
   switch (comment.DataType)
   {
      case RasterCommentMetadataDataType.Ascii:
         Debug.WriteLine("Comment of type " + comment.Type.ToString() + " = " + comment.ToAscii());
         break;
   }
}
      
public async Task CommentsExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = @"Assets\Image1.cmp";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));
   //Ascii
   RasterCommentMetadata commentDataAscii = new RasterCommentMetadata();
   // set the artist comment
   commentDataAscii.Type = RasterCommentMetadataType.Artist;
   commentDataAscii.FromAscii("Test String");
   image.Comments.Add(commentDataAscii);

   codecs.Options.Save.Comments = true;
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync("IMAGE1_COMMENTS.TIF");
   ILeadStream saveStream = LeadStreamFactory.Create(saveFile);
   await codecs.SaveAsync(image, saveStream, RasterImageFormat.Tif, 0);

   // load the comment together with the image
   loadFile = await Tools.AppLocalFolder.GetFileAsync("IMAGE1_COMMENTS.TIF");
   RasterCommentMetadata comment = await codecs.ReadCommentAsync(LeadStreamFactory.Create(loadFile), 1, RasterCommentMetadataType.Artist);
   DisplayComment(comment);

   codecs.Dispose();
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Dicom;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Examples;
using Leadtools.Windows.Media;

private void DisplayComment(RasterCommentMetadata comment)
{
   switch (comment.DataType)
   {
      case RasterCommentMetadataDataType.Ascii:
         Debug.WriteLine("Comment of type " + comment.Type.ToString() + " = " + comment.ToAscii());
         break;
   }
}
public void CommentsExample(RasterImage image, Stream destStream)
{
   //Ascii
   RasterCommentMetadata commentDataAscii = new RasterCommentMetadata();
   // set the artist comment
   commentDataAscii.Type = RasterCommentMetadataType.Artist;
   commentDataAscii.FromAscii("Test String");
   image.Comments.Add(commentDataAscii);
   RasterCodecs codecs = new RasterCodecs();
   codecs.Options.Save.Comments = true;
   codecs.Save(image, destStream, RasterImageFormat.Tif, 0);
   // load the comment together with the image

   RasterCommentMetadata comment = codecs.ReadComment(destStream, 1, RasterCommentMetadataType.Artist);
   DisplayComment(comment);
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Dicom
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Windows.Media

Private Sub DisplayComment(ByVal comment As RasterCommentMetadata)
   Select Case comment.DataType
      Case RasterCommentMetadataDataType.Ascii
         Debug.WriteLine("Comment of type " & comment.Type.ToString() & " = " & comment.ToAscii())
   End Select
End Sub
Public Sub CommentsExample(ByVal image As RasterImage, ByVal destStream As Stream)
   'Ascii
   Dim commentDataAscii As RasterCommentMetadata = New RasterCommentMetadata()
   ' set the artist comment
   commentDataAscii.Type = RasterCommentMetadataType.Artist
   commentDataAscii.FromAscii("Test String")
   image.Comments.Add(commentDataAscii)
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Options.Save.Comments = True
   codecs.Save(image, destStream, RasterImageFormat.Tif, 0)
   ' load the comment together with the image

   Dim comment As RasterCommentMetadata = codecs.ReadComment(destStream, 1, RasterCommentMetadataType.Artist)
   DisplayComment(comment)
End Sub
Requirements

Target Platforms

See Also

Reference

RasterImage Class
RasterImage Members

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