32位程式訪問64位系統上的Windows註冊表

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今天在工作的過程中遇到個奇怪的為問題，就是通過c#擷取註冊表索引值的問題，一般都比較簡單：

 string SQLPath = string.Empty;                        RegistryKey hkml = Registry.LocalMachine;            RegistryKey MSSQLServerKey = hkml.OpenSubKey(@"SOFTWARE\MICROSOFT\MSSQLServer");            if (MSSQLServerKey != null)            {                string[] keys = MSSQLServerKey.GetSubKeyNames();                RegistryKey setupKey = MSSQLServerKey.OpenSubKey("Setup");                if(setupKey!=null)                {                    SQLPath = setupKey.GetValue("SQLPath").ToString();                }}

但是我要取得值就是沒有得到，debug,發現setupkey返回為null,開啟原生註冊表是有的阿，奇了怪了……

這是怎麼回事？？？？  問了同事，他也覺得奇怪。 後來我發現是不是註冊表位元問題啊，一下子找到為什麼系統返回是缺少的那些索引值。

發現Wow6432Node下面返回的就是我們在debug時候的傳回值。

這下感覺找到瞭解決問題的方向了。就是要解決32位程式訪問64位系統上的Windows註冊表的問題。

最後在網上找到了兩位高人的解法，我在這裡都貼出來

C# 32位程式訪問64位系統註冊表

使用.netFx4.0提供的方法解決32位程式訪問64位系統的64位註冊表

 

最後我嘗試使用了後一種方法，解決了這個問題。在此，非常感謝浪穀的解決方案。

  public static string GetSQLServerInstallPath()        {            string SQLPath = string.Empty;                        RegistryKey hkml = Registry.LocalMachine;            RegistryKey MSSQLServerKey = hkml.OpenSubKey(@"SOFTWARE\MICROSOFT\MSSQLServer");            if (MSSQLServerKey != null)            {                string[] keys = MSSQLServerKey.GetSubKeyNames();                RegistryKey setupKey = MSSQLServerKey.OpenSubKey("Setup");                if(setupKey!=null)                {                    SQLPath = setupKey.GetValue("SQLPath").ToString();                }              else                                 {                    SQLPath = Get64BitRegistryKey(RegistryHive.LocalMachine, @"SOFTWARE\MICROSOFT\MSSQLServer\Setup", "SQLPath", RegistryView.Registry64);                }            }            return SQLPath;        }        /// <summary>        /// this method is use for the 32appliction to get the 64bit regestkey        /// </summary>        /// <param name="parentKeyName"></param>        /// <param name="subKeyName"></param>        /// <param name="keyName"></param>        /// <returns></returns>        public static string Get64BitRegistryKey(RegistryHive hive,string keyName,string valueName,RegistryView view)        {            Microsoft.Win32.SafeHandles.SafeRegistryHandle handle = new Microsoft.Win32.SafeHandles.SafeRegistryHandle(GetHiveHandle(hive),true);            RegistryKey subkey = RegistryKey.FromHandle(handle, view).OpenSubKey(keyName);            RegistryKey key = RegistryKey.FromHandle(subkey.Handle, view);            return key.GetValue(valueName).ToString();        }        static IntPtr GetHiveHandle(RegistryHive hive)        {            IntPtr preexistingHandle = IntPtr.Zero;            IntPtr HKEY_CLASSES_ROOT = new IntPtr(-2147483648);            IntPtr HKEY_CURRENT_USER = new IntPtr(-2147483647);            IntPtr HKEY_LOCAL_MACHINE = new IntPtr(-2147483646);            IntPtr HKEY_USERS = new IntPtr(-2147483645);            IntPtr HKEY_PERFORMANCE_DATA = new IntPtr(-2147483644);            IntPtr HKEY_CURRENT_CONFIG = new IntPtr(-2147483643);            IntPtr HKEY_DYN_DATA = new IntPtr(-2147483642);            switch (hive)            {                case RegistryHive.ClassesRoot: preexistingHandle = HKEY_CLASSES_ROOT; break;                case RegistryHive.CurrentUser: preexistingHandle = HKEY_CURRENT_USER; break;                case RegistryHive.LocalMachine: preexistingHandle = HKEY_LOCAL_MACHINE; break;                case RegistryHive.Users: preexistingHandle = HKEY_USERS; break;                case RegistryHive.PerformanceData: preexistingHandle = HKEY_PERFORMANCE_DATA; break;                case RegistryHive.CurrentConfig: preexistingHandle = HKEY_CURRENT_CONFIG; break;                case RegistryHive.DynData: preexistingHandle = HKEY_DYN_DATA; break;            }            return preexistingHandle;        }

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