WriteMarker(string,int,RasterMarkerMetadata) Method

Summary

Writes a marker to an existing file.

Syntax

Objective-C

C++/CLI

Python

public void WriteMarker( 
   string fileName, 
   int pageNumber, 
   RasterMarkerMetadata marker 
)

- (BOOL)writeMarker:(nullable LTRasterMarkerMetadata *)marker  
             toFile:(NSString *)file  
         pageNumber:(NSInteger)pageNumber  
              error:(NSError **)error

public: 
void WriteMarker(  
   String^ fileName, 
   int pageNumber, 
   RasterMarkerMetadata^ marker 
)

def WriteMarker(self,fileName,pageNumber,marker):

Parameters

fileName
A String that contains the file name.

pageNumber
1-based index of the page at which to write the marker.

marker
A RasterMarkerMetadata object that contains the marker data.

Remarks

For Exif files, this metadata collection will contain all the Exif and GPS comments, stored in APP1. It will also contain the audio information stored in APP2.

When you add or remove tags, the tags array at the end of the file is re-written. When you modify existing tags, the new tag value is added to the file and the IFD is modified as necessary. In all of these cases, there is no image recompression.

Only JPEG and Exif JPEG files support writing markers.

Example

This example read the markers from a source file and saving them to a destination file

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
 
 
void MarkersExample(string srcFileName, string destFileName) 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Load the source image with markers 
   Debug.WriteLine("Loading the source image with all markers"); 
   codecs.Options.Load.Markers = true; 
   RasterImage srcImage = codecs.Load(srcFileName); 
 
   // Show the markers loaded 
   Debug.WriteLine("These markers were loaded:"); 
   foreach (RasterMarkerMetadata marker in srcImage.Markers) 
   { 
      byte[] data = marker.GetData(); 
      codecs.WriteMarker(srcFileName, 1, marker); 
      // codecs.WriteMarker(stream, 1, marker); 
      codecs.WriteTransformMarker(marker.Id, data, 0, 1); 
      Debug.WriteLine(" {0}, DataSize:{1}", marker.Id, data.Length); 
   } 
 
   // Create the destination image 
   RasterImage destImage = new RasterImage( 
      RasterMemoryFlags.Conventional, 
      320, 
      20, 
      24, 
      RasterByteOrder.Bgr, 
      RasterViewPerspective.TopLeft, 
      null, 
      IntPtr.Zero, 
      0); 
 
   // Save this as JPEG 
   codecs.Save(destImage, destFileName, RasterImageFormat.Jpeg, 24); 
 
   // Write the markers from the source image to this destination image 
   Debug.WriteLine("Writing the markers to the destination file"); 
   codecs.WriteMarkers(destFileName, 1, srcImage.Markers); 
 
   srcImage.Dispose(); 
   destImage.Dispose(); 
 
   // Re-load the destination image with markers 
   Debug.WriteLine("Loading the destination image with all markers"); 
   codecs.Options.Load.Markers = true; 
   destImage = codecs.Load(destFileName); 
 
   // Show the markers loaded 
   Debug.WriteLine("These markers were loaded:"); 
   foreach (RasterMarkerMetadata marker in destImage.Markers) 
   { 
      byte[] data = marker.GetData(); 
      Debug.WriteLine(" {0}, DataSize:{1}", marker.Id, data.Length); 
   } 
 
   destImage.Dispose(); 
 
   // Clean up 
   codecs.Dispose(); 
}

Requirements

Target Platforms

Reference

RasterCodecs Class

RasterCodecs Members

RasterCodecs.MarkersSupported

RasterCodecs.ReadMarkers

Overload List

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Help Version 22.0.2023.5.5

Leadtools.Codecs Assembly

Introduction

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Leadtools.Codecs Namespace

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