Data Property

Summary

Gets the data for the image in native format.

Syntax

Objective-C

C++

Java

public object Data { get; }

Public ReadOnly Property Data As Object

@property (nonatomic, assign, readonly, nullable) const NSData *data

public Object getData()

public: 
property Object^ Data { 
   Object^ get(); 
}

Property Value

The data for the image.

Remarks

This value should only be used with images created with user-defined data. Other type of images will return an undefined internal value.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using Leadtools.Svg; 
 
 
public void DataExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Data.bmp"); 
 
	// Create an image with user defined data 
	int width = 40; 
	int height = 40; 
	int bitsPerPixel = 24; 
	int size = width * height * 3; 
	IntPtr data1 = Marshal.AllocHGlobal(size); 
 
	// Load the image 
	RasterImage image = new RasterImage( 
	   RasterMemoryFlags.User, 
	   width, 
	   height, 
	   bitsPerPixel, 
	   RasterByteOrder.Bgr, 
	   RasterViewPerspective.TopLeft, 
	   null, 
	   data1, 
	   size); 
 
	// Get a pointer to the internal data and fill it with gray shades 
	long dataSize = image.DataSize; 
 
	byte[] buffer = new byte[dataSize]; 
	bool inc = true; 
	byte value = 0; 
	for (int i = 0; i < buffer.Length; i += 3) 
	{ 
		buffer[i + 0] = value; 
		buffer[i + 1] = value; 
		buffer[i + 2] = value; 
 
		if (inc) 
		{ 
			if (value == 255) 
			{ 
				inc = false; 
				value = 254; 
			} 
			else 
				value++; 
		} 
		else 
		{ 
			if (value == 0) 
			{ 
				inc = true; 
				value = 1; 
			} 
			else 
				value--; 
		} 
	} 
 
	// Copy this buffer to the image data 
	IntPtr data2 = (IntPtr)image.Data; 
	Marshal.Copy(buffer, 0, data2, buffer.Length); 
 
	// Save the image 
	codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
 
	image.Dispose(); 
	Marshal.FreeHGlobal(data1); 
	codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Controls 
Imports Leadtools.Dicom 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Public Sub DataExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Data.bmp") 
 
   ' Create an image with user defined data 
   Dim width As Integer = 40 
   Dim height As Integer = 40 
   Dim bitsPerPixel As Integer = 24 
   Dim size As Integer = width * height * 3 
   Dim data1 As IntPtr = Marshal.AllocHGlobal(size) 
 
   ' Load the image 
   Dim image As RasterImage = New RasterImage(RasterMemoryFlags.User, width, height, bitsPerPixel, RasterByteOrder.Bgr, 
                                              RasterViewPerspective.TopLeft, Nothing, data1, size) 
 
   ' Get a pointer to the internal data and fill it with gray shades 
   Dim dataSize As Integer = CInt(image.DataSize) 
 
   Dim buffer As Byte() = New Byte(dataSize - 1) {} 
   Dim inc As Boolean = True 
   Dim value As Byte = 0 
   Dim i As Integer = 0 
   Do While i < buffer.Length 
      buffer(i + 0) = value 
      buffer(i + 1) = value 
      buffer(i + 2) = value 
 
      If inc Then 
         If value = 255 Then 
            inc = False 
            value = 254 
         Else 
            value = value + Convert.ToByte(1) 
         End If 
      Else 
         If value = 0 Then 
            inc = True 
            value = 1 
         Else 
            value = value - Convert.ToByte(1) 
         End If 
      End If 
      i += 3 
   Loop 
 
   ' Copy this buffer to the image data 
   Dim data2 As IntPtr = CType(image.Data, IntPtr) 
   Marshal.Copy(buffer, 0, data2, buffer.Length) 
 
   ' Save the image 
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24) 
 
   image.Dispose() 
   Marshal.FreeHGlobal(data1) 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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Help Version 21.0.2021.7.2

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies