Buffer Property

Summary

Gets a pointer to the unmanaged memory containing the GeoKey data.

Syntax

Objective-C

C++/CLI

Java

Python

public RasterNativeBuffer Buffer { get; }

@property (nonatomic, assign, readonly, nullable) const unsigned char *data 
@property (nonatomic, assign, readonly)           NSUInteger dataLength

public RasterNativeBuffer getBuffer()

public: 
property RasterNativeBuffer Buffer { 
   RasterNativeBuffer get(); 
}

Buffer # get  (CodecsEnumGeoKeysEventArgs)

Property Value

A pointer to the unmanaged memory containing the GeoKey data.

Remarks

The number of bytes in Buffer can be obtained by RasterNativeBuffer.Length, while the number of items can be obtained by Count.

You can also construct a new RasterTagMetadata object from the data stored in this CodecsEnumGeoKeysEventArgs using the ToRasterTagMetadata method.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
 
 
 
IList<RasterTagMetadata> myGeoKeys; 
 
 
void EnumGeoKeysExample(string srcFileName, string destFileName) 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   geoKeySrcFileName = srcFileName; 
   myGeoKeys = new List<RasterTagMetadata>(); 
 
   codecs.GeoKeyFound += new EventHandler<CodecsEnumGeoKeysEventArgs>(codecs_GeyKeyFound); 
   codecs.EnumGeoKeys(srcFileName, 1); 
   codecs.GeoKeyFound -= new EventHandler<CodecsEnumGeoKeysEventArgs>(codecs_GeyKeyFound); 
 
   // We read all the tags now, save them to the file 
   Debug.WriteLine("{0} GeoKeys read, saving them to the destination file", myGeoKeys.Count); 
   codecs.WriteGeoKeys(destFileName, 1, myGeoKeys); 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
void codecs_GeyKeyFound(object sender, CodecsEnumGeoKeysEventArgs e) 
{ 
   Debug.WriteLine("GeoKey: Id={0}, Count={1}, Type={2}, Data Length={3}, Data=, Cancel={4}", e.Id, e.Count, e.MetadataType, e.Buffer.Length, e.Cancel); 
 
   // Load this GeoKey 
   RasterCodecs codecs = sender as RasterCodecs; 
   RasterTagMetadata geoKey = codecs.ReadGeoKey(geoKeySrcFileName, 1, e.Id); 
   byte[] data = geoKey.GetData(); 
   for (int i = 0; i < data.Length; i++) 
      Debug.WriteLine("{0:X} ", data[i].ToString()); 
 
   // Add it to our collection 
   myGeoKeys.Add(geoKey); 
   e.ToRasterTagMetadata(); 
}

 
import java.io.*; 
import java.net.*; 
import java.nio.file.Paths; 
import java.util.*; 
import java.time.Instant; 
import java.time.Duration; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.codecs.RasterCodecs.FeedCallbackThunk; 
import leadtools.drawing.internal.*; 
import leadtools.imageprocessing.*; 
import leadtools.imageprocessing.color.ChangeIntensityCommand; 
import leadtools.svg.*; 
 
 
RasterCollection<RasterTagMetadata> myGeoKeys; 
String geoKeySrcFileName; 
 
public void enumGeoKeysExample() throws IOException { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "raster_image_enum_geokey.tif"); 
   String destFileName = combine(LEAD_VARS_IMAGES_DIR, "raster_image_enum_geokeys_out.tif"); 
   RasterCodecs codecs = new RasterCodecs(); 
 
   geoKeySrcFileName = srcFileName; 
   myGeoKeys = new RasterCollection<RasterTagMetadata>(); 
 
   codecs.addGeoKeyFoundListener(codecsGetKeyFound); 
   ILeadStream srcFileStream = LeadStreamFactory.create(srcFileName); 
 
   codecs.enumGeoKeys(srcFileStream, 1); 
   codecs.removeGeoKeyFoundListener(codecsGetKeyFound); 
 
   // We read all the tags now, save them to the file 
   System.out.println(myGeoKeys.getCount() + " GeoKeys read, saving them to the destination file"); 
   ILeadStream destFileStream = LeadStreamFactory.create(destFileName); 
   RasterImage srcImage = codecs.load(srcFileName); 
 
   codecs.save(srcImage, destFileStream, RasterImageFormat.TIF, 0); 
   codecs.writeGeoKeys(destFileStream, 1, myGeoKeys); 
 
   // Clean up 
   srcFileStream.close(); 
   destFileStream.close(); 
   codecs.dispose(); 
} 
 
CodecsGeoKeyFoundListener codecsGetKeyFound = new CodecsGeoKeyFoundListener() { 
 
   @Override 
   public void onGeoKeyFound(CodecsEnumGeoKeysEvent e) { 
      System.out.printf("GeoKey: Id=%s, Count=%s, Type=%s, Data Length=%s, Data=, Cancel=%s%n", e.getId(), 
            e.getCount(), e.getMetadataType(), e.getBuffer().getLength(), e.getCancel()); 
      // Load this GeoKey 
      RasterCodecs codecs = (RasterCodecs) e.getSource(); 
      ILeadStream geoStream = LeadStreamFactory.create(geoKeySrcFileName); 
      RasterTagMetadata geoKey = codecs.readGeoKey(geoStream, 1, e.getId()); 
      byte[] data = geoKey.getData(); 
      for (int i = 0; i < data.length; i++) 
         System.out.println(data[i]); 
 
      // Add it to our collection 
      myGeoKeys.add(geoKey); 
      e.toRasterTagMetadata(); 
      try { 
         geoStream.close(); 
      } catch (IOException e1) { 
         e1.printStackTrace(); 
      } 
   } 
 
};

Requirements

Target Platforms

Reference

CodecsEnumGeoKeysEventArgs Class

CodecsEnumGeoKeysEventArgs Members

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Help Version 23.0.2024.2.29

Leadtools.Codecs Assembly

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Leadtools.Codecs Namespace

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