WriteGeoKeys(Stream,int,IEnumerable<RasterTagMetadata>) Method

Summary

Writes or changes one or more GeoKeys to an existing stream.

Syntax

Objective-C

C++/CLI

Java

Python

public void WriteGeoKeys( 
   Stream stream, 
   int pageNumber, 
   IEnumerable<RasterTagMetadata> geoKeys 
)

- (BOOL)writeGeoKeys:(nullable NSArray<LTRasterTagMetadata *> *)geoKeys  
            toStream:(LTLeadStream *)stream  
          pageNumber:(NSInteger)pageNumber  
               error:(NSError **)error

public void writeGeoKeys(ILeadStream stream, int pageNumber, RasterCollection<RasterTagMetadata> geoKeys)

public: 
void WriteGeoKeys(  
   Stream^ stream, 
   int pageNumber, 
   IEnumerable<RasterTagMetadata^>^ geoKeys 
)

def WriteGeoKeys(self,stream,pageNumber,geoKeys):

Parameters

stream
A Stream that contains the file data.

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

geoKeys
A collection of RasterTagMetadata GeoKey objects to identify the data in the TIFF file.

Remarks

This method writes to or changes the GeoKeys in an existing file.

This method works only with TIFF files. If you also want to write the other TIFF tags and comments, use WriteMarkers instead.

Note: Use this method carefully. LEADTOOLS will not restrict the GeoKeys that you write. If you write bad GeoKeys, the file might become corrupted. Consult the GeoTIFF specification documentation for a list of GeoKeys.

Some restrictions apply to this function if you use an IFD to indicate to which page to write the GeoKey. See the Loading and Saving Large TIFF / BigTIFF Files topic for more information.

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

RasterCodecs Class

RasterCodecs Members

Overload List

Implementing GeoKeys (GeoTIFF tags)

Implementing TIFF Comments and Tags

Working with Markers

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