Sfall-ScriptEditor

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using System;
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using System.Collections.Generic;
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using System.Text;
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using Microsoft.Win32;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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using System.IO;
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namespace ScriptEditor
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{
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    public static class FileAssociation
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    {
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        [DllImport("shell32.dll", SetLastError = true)]
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        private static extern void SHChangeNotify(int wEventId, uint uFlags, IntPtr dwItem1, IntPtr dwItem2);
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        private const string FILE_EXTENSION = ".ssl";
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        private const int SHCNE_ASSOCCHANGED = 0x8000000;
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        private const uint SHCNF_IDLIST = 0x0U;
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        private static readonly string appName = "SfallScriptEditor";
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        private static readonly string[] extAllowed = { FILE_EXTENSION, ".msg", ".int", ".fcd", ".h", ".ini", ".txt", ".cfg", ".xshd" };
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        public static bool CheckFileAllow(string ext, out bool Exists)
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        {
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            if (File.Exists(ext))
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                Exists = true;
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            else 
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                Exists = false;
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            ext = Path.GetExtension(ext).ToLowerInvariant();
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            bool result = (Array.IndexOf(extAllowed, ext) > -1);
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            if (!result)
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                MessageBox.Show("You can not open this file type in the editor.", "Error - file is not allowed");
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            return result;
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        }
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        public static void Associate(bool force = false)
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        {
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            if (!force && IsAssociated)
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                return; 
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            if (MessageBox.Show("Do you want to associate the files (.ssl .int and .msg) to the script editor?",
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                "Associate files", MessageBoxButtons.YesNo) == DialogResult.No)
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                return;
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            for (int i = 0; i < 4; i++)
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            {
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                // Удалить ранее ассоциированные с файлом разделы
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                var value = Registry.ClassesRoot.CreateSubKey(extAllowed[i]).GetValue("");
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                if (value != null)
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                    Registry.ClassesRoot.DeleteSubKeyTree(value.ToString(), false);
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                // Создаем новый раздел
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                Registry.ClassesRoot.CreateSubKey(extAllowed[i]).SetValue("", appName + extAllowed[i].Remove(0,1).ToUpper());
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                using (RegistryKey key = Registry.ClassesRoot.CreateSubKey(appName + extAllowed[i].Remove(0, 1).ToUpper()))
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                {
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                    key.SetValue("", "Sfall Script Editor v.4.0");
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                    key.SetValue("AlwaysShowExt", "");
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                    key.CreateSubKey("DefaultIcon").SetValue("", Settings.ResourcesFolder + "\\icon_" + extAllowed[i].Remove(0,1) + ".ico");
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                    key.CreateSubKey("Shell").SetValue("", "OpenSSEditor");
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                    key.CreateSubKey(@"Shell\OpenSSEditor").SetValue("", "Open in Sfall ScriptEditor");
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                    key.CreateSubKey(@"Shell\OpenSSEditor\Command").SetValue("", Application.ExecutablePath + " \"%1\"");
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                }
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            }
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            SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero);
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        }
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        private static bool IsAssociated
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        {
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            get {
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                string value = "";
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                var reg = Registry.ClassesRoot.OpenSubKey(FILE_EXTENSION, false);
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                if (reg != null)
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                     value = reg.GetValue("", string.Empty).ToString();  
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                return (value == (appName + "SSL"));
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            }
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        }
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        public static bool CheckFCDFile(ref string file)
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        {
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            string fltmp = file;
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            if (Path.GetExtension(fltmp) == ".fcd") {
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                    fltmp = Path.ChangeExtension(fltmp, ".ssl");
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                    if (File.Exists(fltmp)){
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                        file = fltmp;
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                        return true;
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                    } else {
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                        int z = fltmp.LastIndexOf(Path.DirectorySeparatorChar);
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                        if (z > 0) {
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                            z = fltmp.LastIndexOf(Path.DirectorySeparatorChar, z - 1);
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                            if (z > 0) {
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                                string path = fltmp.Remove(z + 1);
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                                fltmp = Path.Combine(path, Path.GetFileName(fltmp));
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                                if (File.Exists(fltmp)) {
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                                    file = fltmp;
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                                    return true;
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                                }
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                            }
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                        }
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                    }
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                    file = null;
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            }
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            if (file == null)
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                MessageBox.Show("The script file for this flowchart was not found.", "Missing script file");
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            return false;
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        }
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    }
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}
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