Height Property

Summary

Gets the height of the RasterImage object being created in pixels.

Syntax

Objective-C

C++/CLI

Java

Python

public int Height { get; }

@property (nonatomic, assign, readonly) NSInteger height;

public int getHeight();

public: 
property int Height { 
   int get(); 
}

Height # get  (RasterImageAllocateData)

Property Value

The height of the RasterImage object being created in pixels.

Remarks

You cannot change the width, height, bits/pixel, order or size of the RasterImage object being created. You can however inspect and change the memory model (conventional, disk, tiled, etc.).

Example

using Leadtools; 
using Leadtools.Codecs; 
 
 
private void SetRasterImageAllocateCallbackExample() 
{ 
	try 
	{ 
		// Set the LEADTOOLS temporary directory to a value we can watch easily 
		RasterDefaults.TemporaryDirectory = Path.Combine(LEAD_VARS.ImagesDir, @"Temp\LEADTOOLS"); 
 
		// Install a callback to notify us when LEADTOOLS images are created 
		// IMPORTANT: SetRasterImageAllocateCallback is global and not thread safe. It will fire 
		// for each image being created after this point, so if the action you are performing in the 
		// callback requires synchronzation, add the required code. For what this sample is trying 
		// to accomplish, our solution is perfectly safe and no synchronization is needed. 
		RasterDefaults.SetRasterImageAllocateCallback(new RasterImageAllocateCallback(MyRasterImageAllocateCallback)); 
 
		// We want conventional memory and nothing else 
		RasterMemoryFlags flags = RasterMemoryFlags.Conventional | RasterMemoryFlags.NoDisk | RasterMemoryFlags.NoTiled; 
		// Create a huge RasterImage 
		using (RasterImage img = new RasterImage(flags, 20000, 20000, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, null, null, 0)) 
		{ 
			// Rotate it 90 degrees, this will have a memory size greater than the default 
			// size of conventional memory and cause LEADTOOLS to switch to a disk or tiled memory 
			// model. In the callback below, we instruct LEADTOOLS to only use conventional memory so the command 
			// will throw an out of memory exception as expected. 
			Leadtools.ImageProcessing.RotateCommand cmd = new Leadtools.ImageProcessing.RotateCommand(); 
			cmd.Angle = 90 * 100; 
			// Exception will be thrown inside here: No Memory since our callback 
			// will be called and we instruct LEADTOOLS to not use disk 
			cmd.Run(img); 
		} 
	} 
	catch (Exception ex) 
	{ 
		// Show the error 
		Console.WriteLine(ex.Message); 
	} 
} 
 
private static RasterExceptionCode MyRasterImageAllocateCallback(RasterImageAllocateData data) 
{ 
	Console.WriteLine("Trying to allocate:"); 
	Console.WriteLine("   Memory: {0}", data.MemoryFlags); 
	Console.WriteLine("   Size: {0} by {1}", data.Width, data.Height); 
	Console.WriteLine("   BPP: {0}, Order: {1}", data.BitsPerPixel, data.Order); 
	Console.WriteLine("   Size: {0}", data.Size); 
 
	// Note, all values beside MemoryFlags are read only and cannot be changed 
 
	// We want conventional memory and nothing else, so change this 
	data.MemoryFlags = RasterMemoryFlags.Conventional | RasterMemoryFlags.NoTiled | RasterMemoryFlags.NoDisk; 
 
	// If you remove the code above, the toolkit will most probably switch to disk or tiled memory model 
	// and creating this huge image will be successful, however, we only want conventional 
	// memory in this example, and out of memory exception is the expected behavior of this 
	// example 
 
	// Let LEADTOOLS continue with creating the image process 
	// You can return any other value to abort 
	return RasterExceptionCode.Success; 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImageAllocateData Class

RasterImageAllocateData Members

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Help Version 22.0.2023.5.16

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies