C#32位程序读写64注册表

public class Utility
{
#region 32位程序读写64注册表

static UIntPtr HKEY_CLASSES_ROOT = (UIntPtr)0x80000000;
static UIntPtr HKEY_CURRENT_USER = (UIntPtr)0x80000001;
static UIntPtr HKEY_LOCAL_MACHINE = (UIntPtr)0x80000002;
static UIntPtr HKEY_USERS = (UIntPtr)0x80000003;
static UIntPtr HKEY_CURRENT_CONFIG = (UIntPtr)0x80000005;

// 关闭64位（文件系统）的操作转向
[DllImport("Kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool Wow64DisableWow64FsRedirection(ref IntPtr ptr);
// 开启64位（文件系统）的操作转向
[DllImport("Kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool Wow64RevertWow64FsRedirection(IntPtr ptr);

// 获取操作Key值句柄
[DllImport("Advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern uint RegOpenKeyEx(UIntPtr hKey, string lpSubKey, uint ulOptions, int samDesired, out IntPtr phkResult);
//关闭注册表转向（禁用特定项的注册表反射）
[DllImport("Advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern long RegDisableReflectionKey(IntPtr hKey);
//使能注册表转向（开启特定项的注册表反射）
[DllImport("Advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern long RegEnableReflectionKey(IntPtr hKey);
//获取Key值（即：Key值句柄所标志的Key对象的值）
[DllImport("Advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern int RegQueryValueEx(IntPtr hKey, string lpValueName, int lpReserved,
out uint lpType, System.Text.StringBuilder lpData,
ref uint lpcbData);

private static UIntPtr TransferKeyName(string keyName)
{
switch (keyName)
{
case "HKEY_CLASSES_ROOT":
return HKEY_CLASSES_ROOT;
case "HKEY_CURRENT_USER":
return HKEY_CURRENT_USER;
case "HKEY_LOCAL_MACHINE":
return HKEY_LOCAL_MACHINE;
case "HKEY_USERS":
return HKEY_USERS;
case "HKEY_CURRENT_CONFIG":
return HKEY_CURRENT_CONFIG;
}

return HKEY_CLASSES_ROOT;
}

public static string Get64BitRegistryKey(string parentKeyName, string subKeyName, string keyName)
{
int KEY_QUERY_VALUE = (0x0001);
int KEY_WOW64_64KEY = (0x0100);
int KEY_ALL_WOW64 = (KEY_QUERY_VALUE | KEY_WOW64_64KEY);

try
{
//将Windows注册表主键名转化成为不带正负号的

整形句柄（与平台是32或者64位有关）
UIntPtr hKey = TransferKeyName(parentKeyName);

//声明将要获取Key值的句柄
IntPtr pHKey = IntPtr.Zero;

//记录读取到的Key值
StringBuilder result = new StringBuilder("".PadLeft(1024));
uint resultSize = 1024;
uint lpType = 0;

//关闭文件系统转向
IntPtr oldWOW64State = new IntPtr();
if (Wow64DisableWow64FsRedirection(ref oldWOW64State))
{
//获得操作Key值的句柄
RegOpenKeyEx(hKey, subKeyName, 0, KEY_ALL_WOW64, out pHKey);

//关闭注册表转向（禁止特定项的注册表反射）
RegDisableReflectionKey(pHKey);

//获取访问的Key值
RegQueryValueEx(pHKey, keyName, 0, out lpType, result, ref resultSize);

//打开注册表转向（开启特定项的注册表反射）
RegEnableReflectionKey(pHKey);
}

//打开文件系统转向
Wow64RevertWow64FsRedirection(oldWOW64State);

//返回Key值
return result.ToString().Trim();
}
catch (Exception ex)
{
return null;
}
}

#endregion
}