EZPPClient-Installer/EZPPClient Installer/Utils/OsuUtil.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Path = System.IO.Path;
using File = System.IO.File;
using Microsoft.Win32;

namespace EZPPClient_Installer
{
  class OsuUtil
  {
    public static string osuInstallDir()
    {
      string path = "";
      string registry_key = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";
      string second_registry_key = @"SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall";

      using (Microsoft.Win32.RegistryKey key = Registry.LocalMachine.OpenSubKey(registry_key))
      {
        foreach (string subkey_name in key.GetSubKeyNames())
        {
          using (RegistryKey subkey = key.OpenSubKey(subkey_name))
          {
            if ((string)subkey.GetValue("DisplayName") == "osu!")
            {
              path = Path.GetDirectoryName(subkey.GetValue("DisplayIcon").ToString());
            }
          }
        }
      }

      if (string.IsNullOrEmpty(path))
      {
        using (Microsoft.Win32.RegistryKey key = Registry.LocalMachine.OpenSubKey(second_registry_key))
        {
          foreach (string subkey_name in key.GetSubKeyNames())
          {
            using (RegistryKey subkey = key.OpenSubKey(subkey_name))
            {
              if ((string)subkey.GetValue("DisplayName") == "osu!")
              {
                path = Path.GetDirectoryName(subkey.GetValue("DisplayIcon").ToString());
              }
            }
          }
        }
      }

      return path;
    }
  }
}