[Project] Halo Online Launcher

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Halo_Online_Launcher
{
    public partial class Form1 : Form
    {
        // Kernel Imports
        [DllImport("kernel32.dll")]
        static extern bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, [Out] byte[] lpBuffer, int dwSize, out int lpNumberOfBytesRead);
        [DllImport("kernel32.dll")]
        static extern bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, byte[] lpBuffer, int nSize, out int lpNumberOfBytesWritten);
        [DllImport("kernel32.dll")]
        static extern IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId);
        [DllImport("kernel32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool CloseHandle(IntPtr hObject);

        public Form1()
        {
            // Draw form
            InitializeComponent();

            // Load settings
            string[] lines = File.ReadAllLines("settings.hol");
            dir_val.Text = lines[0].Replace("dir=", "");
            acc_email.Text = lines[1].Replace("email=", "");
            acc_pass.Text = lines[2].Replace("password=", "");
        }

        private void dir_set_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog fbd = new FolderBrowserDialog();
            fbd.Description = "Select your Halo Online installation folder.";
            if (fbd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                dir_val.Text = fbd.SelectedPath;
        }

        private void launch_Click(object sender, EventArgs e)
        {
            // Save settings
            File.WriteAllText("settings.hol", "dir=" + dir_val.Text + Environment.NewLine + "email=" + acc_email.Text + Environment.NewLine + "password=" + acc_pass.Text);

            // Check for files
            if (!File.Exists(dir_val.Text + "\\eldorado.exe"))
                if (MessageBox.Show("You're missing \"eldorado.exe\", would you like to download the english version now?", "Missing File", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes)
                    Process.Start("https://mega.co.nz/#!LcdAhSQK!6XVCyyTBusTQU3CUHDdofXFgIvbyqXHnYy_5fsFv5AM");
            if (!File.Exists(dir_val.Text + "\\HaloFreeLoader.exe"))
                if (MessageBox.Show("You're missing \"HaloFreeLoader.exe\", would you like to download it now?", "Missing File", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes)
                    Process.Start("https://github.com/emoose/HaloFreeLoader/releases");

            // Launch Halo Online
            ProcessStartInfo psi_e = new ProcessStartInfo();
            psi_e.FileName = "eldorado.exe";
            psi_e.WorkingDirectory = dir_val.Text;
            psi_e.Arguments = "--account " + acc_email.Text + " --sign-in-code " + acc_pass.Text;
            Process.Start(psi_e);

            // Forceload map
            Thread.Sleep(5000);
            string str = "";
            if (map.Text == "")
                str = "mainmenu";
            else if (map.Text == "Guardian" || map.Text == "Riverworld")
                str = map.Text.ToLower();
            else
                str = "s3d_" + map.Text.ToLower();
            Process[] processes = Process.GetProcessesByName("eldorado");
            while (processes.Length < 1)
                processes = Process.GetProcessesByName("eldorado");
            IntPtr handle = OpenProcess(0x001F0FFF, true, processes[0].Id);
            int buffer = 0;
            WriteProcessMemory(handle, (IntPtr)0x5056D0, new byte[] { 0xC3 }, 1, out buffer);
            WriteProcessMemory(handle, (IntPtr)0x6D26DF, new byte[] { 0x90, 0x90, 0x90, 0x90, 0x90 }, 5, out buffer);
            while (true)
            {
                byte[] wait = new byte[1];
                ReadProcessMemory(handle, (IntPtr)0x23917F0, wait, 1, out buffer);
                if (wait[0] == 0)
                    break;
            }
            byte[] pbMap = Encoding.ASCII.GetBytes("maps\\" + str);
            WriteProcessMemory(handle, (IntPtr)0x23917F0, new byte[] { 1 }, 1, out buffer);
            WriteProcessMemory(handle, (IntPtr)0x2391800, new byte[] { 2, 0, 0, 0 }, 4, out buffer);
            WriteProcessMemory(handle, (IntPtr)0x2391824, pbMap, pbMap.Length, out buffer);
        }
    }
}