DiskImageView.cs

This code demonstrates how to create an image view on disk and write/read data to/from it. The code creates a 3D image of size 100x100x100 without allocating any CPU memory, and writes a line of data in each slice. Finally, it then reads and prints the value of the last written sample.

using IOLink;
using System;
using System.Runtime.Intrinsics;
 
namespace Examples
{
 
    public class DiskImageView
    {
        static ImageView Generate()
        {
 
            VectorXu64 shape = new VectorXu64(100, 100, 100);
            DataType dt = DataTypeId.DOUBLE;
 
            // create an image view on disk
            ImageView image = ImageViewFactory.CreateOnDisk(shape, dt);
 
            double[] lineBuffer = new double[shape[0]];
            VectorXu64 lineSize = new VectorXu64(shape[0], 1, 1);
 
            Console.WriteLine("Writing data slice by slice, line by line");
 
            // write data slice by slice, line by line with a
            // growing value
            double valueInit = 0;
            for (ulong i = 0; i < shape[2]; ++i)
            {
                for (ulong j = 0; j < shape[1]; ++j)
                {
                    RegionXu64 lineRegion = new RegionXu64(new VectorXu64(0, j, i), lineSize);
 
                    // fill buffer with the same value
                    for (ulong k = 0; k < shape[0]; ++k)
                    {
                        lineBuffer[k] = valueInit;
                    }
 
                    image.WriteRegion(lineRegion, lineBuffer);
                    valueInit++;
                }
            }
 
            Console.WriteLine("Writing completed");
 
            return image;
        }
 
        public static void Main(string[] args)
        {
            var image = Generate();
 
            Console.WriteLine("Reading Last Sample");
 
            byte[] bytearr = new byte[8];
            image.Read(new VectorXu64(99, 99, 99), bytearr);
 
            // convert byte array to double
            double value = BitConverter.ToDouble(bytearr, 0);
 
            Console.WriteLine("Last Sample Value: " + value);
 
            Console.WriteLine("SUCCESS");
        }
    }
}