Sfall-ScriptEditor

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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace ScriptEditor
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{
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    /// <summary>
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    /// Handles enforcing single application instance and interacting with running instance.
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    /// </summary>
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    public static class SingleInstanceManager
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    {
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        private const int HWND_BROADCAST = 0xffff;
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        private static readonly string CommandLineFile = Path.Combine(Path.GetTempPath(), "commandline.txt");
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        [DllImport("user32")]
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        private static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);
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        [DllImport("user32")]
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        private static extern int RegisterWindowMessage(string message);
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        public static readonly int WM_SFALL_SCRIPT_EDITOR_OPEN = RegisterWindowMessage("WM_SFALL_SCRIPT_EDITOR_4_OPEN");
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        public static void SendEditorOpenMessage()
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        {
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            SingleInstanceManager.PostMessage(
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                    (IntPtr)SingleInstanceManager.HWND_BROADCAST,
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                    SingleInstanceManager.WM_SFALL_SCRIPT_EDITOR_OPEN,
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                    IntPtr.Zero,
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                    IntPtr.Zero);
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        }
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        /// <summary>
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        /// Saves command line arguments for use in another instance.
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        /// </summary>
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        /// <param name="args"></param>
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        public static void SaveCommandLine(string[] args)
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        {
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            var fullArgs = new string[args.Length];
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            for (int i = 0; i < args.Length; i++) {
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                fullArgs[i] = Path.IsPathRooted(args[i])
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                    ? args[i]
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                    : Path.GetFullPath(args[i]);
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                File.AppendAllText(SingleInstanceManager.CommandLineFile, fullArgs[i] + Environment.NewLine);
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            }
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        }
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        /// <summary>
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        /// Loads command line arguments previously saved by another instance.
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        /// </summary>
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        /// <returns></returns>
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        public static string[] LoadCommandLine() 
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        {
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            if (File.Exists(SingleInstanceManager.CommandLineFile)) {
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                string[] read = File.ReadAllLines(SingleInstanceManager.CommandLineFile);
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                DeleteCommandLine();
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                return read;
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            }
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            return new string[0];
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        }
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        public static void DeleteCommandLine()
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        {
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            File.Delete(CommandLineFile);
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        }
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    }
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}
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