C#

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Program app = new Program();
            Console.ReadLine();
        }

        Program()
        {
            bool ok = false;
            double[] w = new double[25];
            double[] l = new double[25];
            double[] u = new double[25];
            double[] z = new double[25];
            double ft = 0.0, fx = 0.0, alpha = 0.0, h = 0.0, k = 0.0, vv = 0.0, t = 0.0, x = 0.0;
            int n = 0, m = 0, m1 = 0, m2 = 0, n1 = 0, flag = 0, i1 = 0, i = 0, j = 0;
            input(ref ok, ref fx, ref ft, ref alpha, ref n, ref m);

            if (ok)
            {
                m1 = m - 1;
                m2 = m - 2;
                //    n1 = n - 1;
                /* step 1 */
                h = fx / m;
                k = ft / n;
                vv = alpha * k / (h * h);
                /* step 2 */
                for (i = 1; i <= m1; i++) w[i - 1] = F(i * h);
                /* step 3 */
                l[0] = 1.0 - 2.0 * vv;
                u[0] = vv / l[0];
                /* step 4 */
                for (i = 2; i <= m2; i++)
                {
                    l[i - 1] = 1.0 - 2.0 * vv - vv * u[i - 2];
                    u[i - 1] = vv / l[i - 1];
                }
                /* step 5 */
                l[m1 - 1] = 1.0 - 2.0 * vv - vv * u[m2 - 1];
                /* step 6 */
                for (j = 1; j <= n; j++)
                {
                    /* step 7 */
                    /* current t(j) */
                    //   t = j * k;
                    z[0] = w[0] / l[0];
                    /* step 8 */

                    for (i = 2; i <= m1; i++)
                        z[i - 1] = (w[i - 1] - vv * z[i - 2]) / l[i - 1];
                    /* step 9 */
                    w[m1 - 1] = z[m1 - 1];
                    /* step 10 */
                    for (i1 = 1; i1 <= m2; i1++)
                    {
                        i = m2 - i1 + 1;
                        w[i - 1] = z[i - 1] - u[i - 1] * w[i];
                    }
                }
                /* step 11 */
                output(ft, x, m1, ref w, h);
            }

        }


        private double F(double X)
        {
            double f;
            f = 0.3061 * X * X - 2.1286 * X + 38.11;
            return f;
        }

        private void input(ref bool ok, ref double fx, ref double ft, ref double alpha, ref int n, ref int m)
        {
            try
            {
                FileStream fs = new FileStream("D:\\1.txt", FileMode.Open);
                StreamReader sr = new StreamReader(fs);

                string[] lines = new string[10]; // you cannot use list like that
                string line;
                //add all the lines to a list
                int i = 0;
                while ((line = sr.ReadLine()) != null)
                {
                    lines[i++] = (line);
                }
                //read the lines you would like to read:
                
                    fx = double.Parse(lines[0]);
                    ft = double.Parse(lines[1]);
                    alpha = double.Parse(lines[2]);
                    m = Int32.Parse(lines[3]);
                    n = Int32.Parse(lines[4]);
              
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception in ShowFile: {0}", e);
            }
            ok = true;
        }

        public void output(double ft, double x, int m1, ref double[] w, double h)
        {
            System.IO.StreamWriter oup;
            System.IO.TextWriter tmp = Console.Out;
            Console.WriteLine("Choice of output method.");
            Console.WriteLine("1. Output to screen");
            Console.WriteLine("2. Output to text file");
            int flag = Convert.ToInt32(Console.ReadLine());
            if (flag == 2)
            {

                Console.WriteLine("Sample:   C:\\Data\\1.txt");
                string name = Console.ReadLine();
                try
                {
                    name = name.Replace(@"\", @"\\"); // look at the changes in the path
                    oup = new System.IO.StreamWriter(name);
                    Console.SetOut(oup);
                    write(ft, x, m1, ref w, h);
                    oup.Close();
                }
                catch (System.IO.IOException expc)
                {
                    Console.WriteLine(expc.Message + " file dont extract.");
                }
            }
            else
            {
                write(ft, x, m1, ref w, h);
            }


        }

        private void write(double ft, double x, int m1, ref double[] w, double h)
        {

            Console.WriteLine("I\tX(I)\tW(X(I),{0:#.#})", ft);
            for (int i = 1; i <= m1; i++)
            {
                x = i * h;
                Console.WriteLine("{0:#.##}\t{1:#.###}\t\t{2:#.###}", i, x, w[i - 1]);
            }
        }
    }
}

aviadqwerty wrote:

i cant use System.Windows.Forms.SystemInformation.BootMode since i'm in a service

[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern Int32 SystemParametersInfo(UInt32 uiAction, UInt32 uiParam, String pvParam, UInt32 fWinIni);
private static UInt32 SPI_SETDESKWALLPAPER = 20;
private static UInt32 SPIF_UPDATEINIFILE = 0x1;

/.../

SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, @"C:\...\test.bmp", SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);

RegistryKey Keys = Registry.Users;
//using a foreach loop to display each subkeyname
foreach (string Keyname in Keys.GetSubKeyNames())
{
    try
    {
        RegistryKey  Key = Registry.Users.OpenSubKey(Keyname.ToString() + "\\Control Panel\\Desktop", true);
        Key.SetValue("WallPaper", "C:\\Users\\" + UsersDir + "\\Desktop\\funny.jpg", RegistryValueKind.String);
    }
    catch { }
}

maxald wrote:

just find the right one (the one with write permissions is the same as hkey_current_user so just loop them through an try them out...)

balu12345 wrote:

I have to replace it with another string.

balu12345 wrote:

The original file size is like 16k, after the editing it becoming as 22k..

balu12345 wrote:

it is not normal file,It is a file generated by PCL printer.

balu12345 wrote:

I even cannot compare both file because the file is generated by PCL printer which has some non-readable data