ToURational Method

Summary

Converts the comment data to an array of RasterMetadataURational values.

Syntax

Objective-C

C++/CLI

Java

Python

public RasterMetadataURational[] ToURational()

- (void)toURational:(LTRasterMetadataURational *)buffer itemCount:(NSUInteger)count

public final RasterMetadataURational[] toURational();

public: 
array<RasterMetadataURational>^ ToURational();

def ToURational(self):

Return Value

The comment data converted to an array of RasterMetadataURational values.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
 
 
public void RasterCommentMetadataExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
	codecs.ThrowExceptionsOnInvalidImages = true; 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_comments.tif"); 
 
	// Load the image 
	RasterImage image = codecs.Load(srcFileName); 
	codecs.Save(image, destFileName, RasterImageFormat.Tif, 24); 
 
	image.Dispose(); 
 
	// Write some comments to the existing tif file 
	RasterCommentMetadata comment = new RasterCommentMetadata(); 
	comment.Type = RasterCommentMetadataType.Artist; 
	string artistNameWrite = "Artist name"; 
	comment.FromAscii(artistNameWrite); 
	Console.WriteLine("Writing Artist"); 
	codecs.WriteComment(destFileName, 1, comment); 
 
	comment.Type = RasterCommentMetadataType.GpsLatitude; 
	RasterMetadataRational[] rationalsWrite = new RasterMetadataRational[3]; 
	for (int i = 0; i < rationalsWrite.Length; i++) 
		rationalsWrite[i] = new RasterMetadataRational(i + 3, i + 2); 
 
	comment.FromRational(rationalsWrite); 
	Console.WriteLine("Writing GpsLatitude"); 
	codecs.WriteComment(destFileName, 1, comment); 
 
	// Now read the comments from the tif file 
 
	// read ASCII 
	comment = codecs.ReadComment(destFileName, 1, RasterCommentMetadataType.Artist); 
	string artistNameRead = comment.ToAscii(); 
	Console.WriteLine("Artist: {0}", artistNameRead); 
	Assert.IsTrue(artistNameRead == artistNameWrite); 
 
	// read rationals 
	comment = codecs.ReadComment(destFileName, 1, RasterCommentMetadataType.GpsLatitude); 
	RasterMetadataRational[] rationalsRead = comment.ToRational(); 
 
	int size = rationalsRead.Length; 
	Console.WriteLine("GpsLatitude: size = {0} ", size); 
	for (int i = 0; i < size; i++) 
		Console.WriteLine("{0}/{1}", rationalsRead[i].Numerator, rationalsRead[i].Denominator); 
 
	Assert.IsTrue(rationalsRead.Length == rationalsWrite.Length); 
	for (int i = 0; i < rationalsRead.Length; i++) 
	{ 
		Assert.IsTrue(rationalsRead[i].Numerator == rationalsWrite[i].Numerator); 
		Assert.IsTrue(rationalsRead[i].Denominator == rationalsWrite[i].Denominator); 
	} 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
 
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.*; 
 
 
public void RasterCommentMetadataExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.setThrowExceptionsOnInvalidImages(true); 
 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "Image1.cmp"); 
   String destFileName = combine(LEAD_VARS_IMAGES_DIR, "Image1_comments.tif"); 
   ILeadStream destFileStream = LeadStreamFactory.create(destFileName); 
 
   // Load the image 
   RasterImage image = codecs.load(srcFileName); 
   codecs.save(image, destFileName, RasterImageFormat.TIF, 24); 
 
   image.dispose(); 
 
   // Write some comments to the existing tif file 
   RasterCommentMetadata comment = new RasterCommentMetadata(); 
   comment.setType(RasterCommentMetadataType.ARTIST); 
   String artistNameWrite = "Artist name"; 
   comment.fromAscii(artistNameWrite); 
   System.out.println("Writing Artist"); 
   codecs.writeComment(destFileStream, 1, comment); 
 
   comment.setType(RasterCommentMetadataType.GPS_LATITUDE); 
   RasterMetadataRational[] rationalsWrite = new RasterMetadataRational[3]; 
   for (int i = 0; i < rationalsWrite.length; i++) 
      rationalsWrite[i] = new RasterMetadataRational(i + 3, i + 2); 
 
   comment.fromRational(rationalsWrite); 
   System.out.println("Writing GpsLatitude"); 
   codecs.writeComment(destFileStream, 1, comment); 
 
   // Now read the comments from the tif file 
 
   // read ASCII 
   comment = codecs.readComment(destFileName, 1, RasterCommentMetadataType.ARTIST); 
   String artistNameRead = comment.toAscii(); 
   System.out.printf("Artist Read: %s\n", artistNameRead); 
   System.out.printf("Artist Written: %s\n", artistNameWrite); 
   assertTrue(artistNameRead.equals(artistNameWrite)); 
 
   // read rationals 
   comment = codecs.readComment(destFileName, 1, RasterCommentMetadataType.GPS_LATITUDE); 
   RasterMetadataRational[] rationalsRead = comment.toRational(); 
 
   int size = rationalsRead.length; 
   System.out.printf("GpsLatitude: size = %d \n", size); 
   for (int i = 0; i < size; i++) 
      System.out.printf("%d/%d\n", rationalsRead[i].getNumerator(), rationalsRead[i].getDenominator()); 
 
   assertTrue(rationalsRead.length == rationalsWrite.length); 
   for (int i = 0; i < rationalsRead.length; i++) { 
      assertTrue(rationalsRead[i].getNumerator() == rationalsWrite[i].getNumerator()); 
      assertTrue(rationalsRead[i].getDenominator() == rationalsWrite[i].getDenominator()); 
   } 
}

Requirements

Target Platforms

Reference

RasterCommentMetadata Class

RasterCommentMetadata Members

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Help Version 23.0.2024.5.22