64位读取注册表与32位的区别

有一个读取注册表信息的程序  if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, subkeystring , 0, KEY_READ, &hKey) == ERROR_SUCCESS)/

，在32位下完全正常，但是在64位返回值正确，但就是读不到东西。后来单步发现读不到东西，就搜64位读注册表失败，发现需要加

if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, subkeystring , 0,KEY_READ|KEY_WOW64_64KEY, &hKey) == ERROR_SUCCESS)就可以了，我是全部把权限提高，还可以根据不同的操作系统，设置不同的参数。

可参考的文献：

http://msdn.microsoft.com/en-us/library/aa384129(v=VS.85).aspx

http://www.codeproject.com/Articles/51326/Net-Compilation-registry-accessing-and-applicatio

http://boluns.blog.163.com/blog/static/69845968201071132032313/

The code

The next code is a personal translation to C# of several pieces of code I found, mostly from here:

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[DllImport("advapi32.dll", CharSet = CharSet.Unicode, EntryPoint = "RegOpenKeyEx")]
static extern int RegOpenKeyEx(IntPtr hKey, string subKey, uint options, int sam, out IntPtr phkResult); [Flags] public enum eRegWow64Options : int { None = 0x0000, KEY_WOW64_64KEY = 0x0100, KEY_WOW64_32KEY = 0x0200, // Add here any others needed, from the table of the previous chapter } [Flags] public enum eRegistryRights : int { ReadKey = 131097, WriteKey = 131078, } public static RegistryKey OpenSubKey(RegistryKey pParentKey, string pSubKeyName, bool pWriteable, eRegWow64Options pOptions) { if (pParentKey == null || GetRegistryKeyHandle(pParentKey).Equals(System.IntPtr.Zero)) throw new System.Exception("OpenSubKey: Parent key is not open"); eRegistryRights Rights = eRegistryRights.ReadKey; if (pWriteable) Rights = eRegistryRights.WriteKey; System.IntPtr SubKeyHandle; System.Int32 Result = RegOpenKeyEx(GetRegistryKeyHandle(pParentKey), pSubKeyName, 0, (int)Rights | (int)pOptions, out SubKeyHandle); if (Result != 0) { System.ComponentModel.Win32Exception W32ex = new System.ComponentModel.Win32Exception(); throw new System.Exception("OpenSubKey: Exception encountered opening key", W32ex); } return PointerToRegistryKey(SubKeyHandle, pWriteable, false); } private static System.IntPtr GetRegistryKeyHandle(RegistryKey pRegisteryKey) { Type Type = Type.GetType("Microsoft.Win32.RegistryKey"); FieldInfo Info = Type.GetField("hkey", BindingFlags.NonPublic | BindingFlags.Instance); SafeHandle Handle = (SafeHandle)Info.GetValue(pRegisteryKey); IntPtr RealHandle = Handle.DangerousGetHandle(); return Handle.DangerousGetHandle(); } private static RegistryKey PointerToRegistryKey(IntPtr hKey, bool pWritable, bool pOwnsHandle) { // Create a SafeHandles.SafeRegistryHandle from this pointer - this is a private class BindingFlags privateConstructors = BindingFlags.Instance | BindingFlags.NonPublic; Type safeRegistryHandleType = typeof( SafeHandleZeroOrMinusOneIsInvalid).Assembly.GetType( "Microsoft.Win32.SafeHandles.SafeRegistryHandle"); Type[] safeRegistryHandleConstructorTypes = new Type[] { typeof(System.IntPtr), typeof(System.Boolean) }; ConstructorInfo safeRegistryHandleConstructor = safeRegistryHandleType.GetConstructor(privateConstructors, null, safeRegistryHandleConstructorTypes, null); Object safeHandle = safeRegistryHandleConstructor.Invoke(new Object[] { hKey, pOwnsHandle }); // Create a new Registry key using the private constructor using the // safeHandle - this should then behave like // a .NET natively opened handle and disposed of correctly Type registryKeyType = typeof(Microsoft.Win32.RegistryKey); Type[] registryKeyConstructorTypes = new Type[] { safeRegistryHandleType, typeof(Boolean) }; ConstructorInfo registryKeyConstructor = registryKeyType.GetConstructor(privateConstructors, null, registryKeyConstructorTypes, null); RegistryKey result = (RegistryKey)registryKeyConstructor.Invoke(new Object[] { safeHandle, pWritable }); return result; }

How to use the Code

The OpenSubKey will return the searched key, allowing you to specify reading from the normal registry, or from the alternative 32-bit, WOW64 registry. The following example reads from the 32-bit WOW64 registry:

try 
{ 
    RegistryKey key = OpenSubKey(Registry.LocalMachine,"Software\\[Key]",false,
        eRegWow64Options.KEY_WOW64_32KEY); 
}
catch 
{ 
    // Parent key not open, exception found at opening (probably related to // security permissions requested) }

You just need to place your key name where “[Key]” is.