ToDouble Method

Summary

Converts the tag data to an array of double precision values.

Syntax

Objective-C

C++/CLI

Java

Python

public double[] ToDouble()

- (void)toDouble:(double *)buffer itemCount:(NSUInteger)count

public double[] toDouble();

public: 
array<double>^ ToDouble();

def ToDouble(self):

Return Value

The tag data converted to an array of double precision values.

Example

using Leadtools; 
using Leadtools.Codecs; 
 
 
public void RasterTagMetadataExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
	codecs.ThrowExceptionsOnInvalidImages = true; 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_tags.tif"); 
 
	// Load the image 
	RasterImage image = codecs.Load(srcFileName); 
 
	// add the tags 
	const int tagSoftware = 0x8001; 
 
	RasterTagMetadata tag; 
 
	// Ascii 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Ascii; 
	tag.FromAscii("Test String"); 
	image.Tags.Add(tag); 
 
	// Byte 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Byte; 
	byte[] byteArray = new byte[1]; 
	byteArray[0] = 10; 
	tag.FromByte(byteArray); 
	image.Tags.Add(tag); 
 
	// SByte 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.SByte; 
	sbyte[] sbyteArray = new sbyte[1]; 
	sbyteArray[0] = -45; 
	tag.FromSByte(sbyteArray); 
	image.Tags.Add(tag); 
 
	// Int16 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Int16; 
	short[] shortArray = new short[1]; 
	shortArray[0] = 64; 
	tag.FromInt16(shortArray); 
	image.Tags.Add(tag); 
 
	// Uint16 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.UInt16; 
	ushort[] uint16Array = new ushort[1]; 
	uint16Array[0] = 50; 
	tag.FromUInt16(uint16Array); 
	image.Tags.Add(tag); 
 
	// Int32 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Int32; 
	int[] intArray = new int[1]; 
	intArray[0] = -1326; 
	tag.FromInt32(intArray); 
	image.Tags.Add(tag); 
 
	// Uint32 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.UInt32; 
	uint[] uintArray = new uint[1]; 
	uintArray[0] = 1326; 
	tag.FromUInt32(uintArray); 
	image.Tags.Add(tag); 
 
	// single 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Single; 
	float[] singleArray = new float[1]; 
	singleArray[0] = 4.53f; 
	tag.FromSingle(singleArray); 
	image.Tags.Add(tag); 
 
	// Double 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Double; 
	double[] doubleArray = new double[1]; 
	doubleArray[0] = 7.1; 
	tag.FromDouble(doubleArray); 
	image.Tags.Add(tag); 
 
	// Rational 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Rational; 
	RasterMetadataRational[] rational = new RasterMetadataRational[1]; 
	rational[0] = new RasterMetadataRational(); 
	rational[0].Numerator = 3; 
	rational[0].Denominator = 2; 
	tag.FromRational(rational); 
	image.Tags.Add(tag); 
 
	// URational 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.URational; 
	RasterMetadataURational[] urational = new RasterMetadataURational[1]; 
	urational[0] = new RasterMetadataURational(3, 2); 
	tag.FromURational(urational); 
	image.Tags.Add(tag); 
 
	// Save the image and its tags to the destination tiff file 
	codecs.Options.Save.Tags = true; 
	codecs.Save(image, destFileName, RasterImageFormat.Tif, 1); 
 
	// Enumerate the tags from the file 
	codecs.TagFound += new EventHandler<CodecsEnumTagsEventArgs>(codecs_TagFound); 
	codecs.EnumTags(destFileName, 1); 
 
	// clean up 
	image.Dispose(); 
	codecs.Dispose(); 
} 
 
void codecs_TagFound(object sender, CodecsEnumTagsEventArgs e) 
{ 
	Console.WriteLine("Found tag id = {0}, count = {1}, type = {2}", e.Id, e.Count, e.MetadataType); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterTagMetadata Class

RasterTagMetadata Members

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Help Version 22.0.2023.5.16

Leadtools Assembly

Introduction

Getting Started

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Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies