    {-# LINE 1 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}
    {-# LANGUAGE Trustworthy #-}
    -----------------------------------------------------------------------------

    -- |

    -- Module      :  System.Win32.Registry

    -- Copyright   :  (c) Alastair Reid, 1997-2003

    -- License     :  BSD-style (see the file libraries/base/LICENSE)

    --

    -- Maintainer  :  Esa Ilari Vuokko <ei@vuokko.info>

    -- Stability   :  provisional

    -- Portability :  portable

    --

    -- A collection of FFI declarations for accessing the Win32 registry.

    --

    -----------------------------------------------------------------------------

    module System.Win32.Registry
                    ( module System.Win32.Registry
                    ) where
    {- What's really on offer:
            (
              regCloseKey        -- :: HKEY -> IO ()
            , regConnectRegistry -- :: Maybe String -> HKEY -> IO HKEY
            , regCreateKey       -- :: HKEY -> String -> IO HKEY
            , regCreateKeyEx     -- :: HKEY -> String -> Maybe String
                                 -- -> RegCreateOptions -> REGSAM
                                 -- -> Maybe LPSECURITY_ATTRIBUTES
                                 -- -> IO (HKEY, Bool)
            , regDeleteKey       -- :: HKEY -> String -> IO ()
            , regDeleteValue     -- :: HKEY -> String -> IO ()
            , regEnumKeys        -- :: HKEY -> IO [String]
            , regEnumKey         -- :: HKEY -> DWORD -> Addr -> DWORD -> IO String
            , regEnumKeyValue    -- :: HKEY -> DWORD -> Addr -> DWORD -> Addr -> DWORD -> IO String
            , regFlushKey        -- :: HKEY -> IO ()
            , regLoadKey         -- :: HKEY -> String -> String -> IO ()
            , regNotifyChangeKeyValue -- :: HKEY -> Bool -> RegNotifyOptions
                                      -- -> HANDLE -> Bool -> IO ()
            , regOpenKey         -- :: HKEY -> String -> IO HKEY
            , regOpenKeyEx       -- :: HKEY -> String -> REGSAM -> IO HKEY
            , regQueryInfoKey    -- :: HKEY -> IO RegInfoKey
            , regQueryValue      -- :: HKEY -> Maybe String -> IO String
            , regQueryDefaultValue -- :: HKEY -> String -> IO String
            , regQueryValueEx    -- :: HKEY -> String -> Addr -> Int -> IO RegValueType
            , regReplaceKey      -- :: HKEY -> Maybe String -> String -> String -> IO ()
            , regRestoreKey      -- :: HKEY -> String -> RegRestoreFlags -> IO ()
            , regSaveKey         -- :: HKEY -> String -> Maybe LPSECURITY_ATTRIBUTES -> IO ()
            , regGetValue        -- :: HKEY -> Maybe String -> Maybe String -> RegTypeRestriction
                                 -- -> Maybe LPDWORD -> Maybe LPVOID -> Maybe LPDWORD -> IO ()
            , regSetValue        -- :: HKEY -> String -> String -> IO ()
            , regSetValueEx      -- :: HKEY -> String -> RegValueType -> LPTSTR -> Int -> IO ()
            , regSetStringValue  -- :: HKEY -> String -> String -> IO ()
            , regUnloadKey       -- :: HKEY -> String -> IO ()
            ) where
    -}

    {-
     Registry API omissions:

       RegQueryMultipleValues()
       RegEnumKeyEx()

    -}

    import Data.Word (Word32)
    import Foreign.ForeignPtr (withForeignPtr)
    import Foreign.Marshal.Alloc (alloca, allocaBytes, free, mallocBytes)
    import Foreign.Marshal.Array (allocaArray0)
    import Foreign.Marshal.Utils (maybeWith, with)
    import Foreign.Ptr (Ptr, castPtr, nullPtr)
    import Foreign.Storable (peek, peekByteOff, peekElemOff, sizeOf)
    import System.IO.Unsafe (unsafePerformIO)
    import System.Win32.File (LPSECURITY_ATTRIBUTES)
    import System.Win32.Time (FILETIME)
    import System.Win32.Types (DWORD, ErrCode, HKEY, LPCTSTR, PKEY, withTString)
    import System.Win32.Types (HANDLE, LONG, LPBYTE, newForeignHANDLE, peekTString)
    import System.Win32.Types (LPTSTR, TCHAR, LPDWORD, LPVOID, failUnlessSuccess)
    import System.Win32.Types (castUINTPtrToPtr, failUnlessSuccessOr, maybePtr)

    #include "windows_cconv.h"

    hKEY_CLASSES_ROOT     :: HKEY
    hKEY_CLASSES_ROOT     = (unsafePerformIO . newForeignHANDLE . castUINTPtrToPtr) 18446744071562067968
    hKEY_CURRENT_CONFIG   :: HKEY
    hKEY_CURRENT_CONFIG   = (unsafePerformIO . newForeignHANDLE . castUINTPtrToPtr) 18446744071562067973
    hKEY_CURRENT_USER     :: HKEY
    hKEY_CURRENT_USER     = (unsafePerformIO . newForeignHANDLE . castUINTPtrToPtr) 18446744071562067969
    hKEY_LOCAL_MACHINE    :: HKEY
    hKEY_LOCAL_MACHINE    = (unsafePerformIO . newForeignHANDLE . castUINTPtrToPtr) 18446744071562067970
    hKEY_USERS            :: HKEY
    hKEY_USERS            = (unsafePerformIO . newForeignHANDLE . castUINTPtrToPtr) 18446744071562067971

    {-# LINE 90 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}
    -- , PKEYERFORMANCE_DATA  NT only

    -- , HKEY_DYN_DATA     95/98 only

    regCloseKey :: HKEY -> IO ()
    regCloseKey key =
      withForeignPtr key $ \ p_key ->
      failUnlessSuccess "RegCloseKey" $ c_RegCloseKey p_key
    foreign import WINDOWS_CCONV unsafe "windows.h RegCloseKey"
      c_RegCloseKey :: PKEY -> IO ErrCode

    -- Connects to a predefined registry handle on another computer.

    regConnectRegistry :: Maybe String -> HKEY -> IO HKEY
    regConnectRegistry mb_machine key =
      withForeignPtr key $ \ p_key ->
      maybeWith withTString mb_machine $ \ c_machine ->
      alloca $ \ p_out_key -> do
      failUnlessSuccess "RegConnectRegistry" $
        c_RegConnectRegistry c_machine p_key p_out_key
      p_new_key <- peek p_out_key
      newForeignHANDLE p_new_key
    foreign import WINDOWS_CCONV unsafe "windows.h RegConnectRegistryW"
      c_RegConnectRegistry :: LPCTSTR -> PKEY -> Ptr PKEY -> IO ErrCode

    regCreateKey :: HKEY -> String -> IO HKEY
    regCreateKey key subkey =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      alloca $ \ p_out_key -> do
      failUnlessSuccess "RegCreateKey" $
        c_RegCreateKey p_key c_subkey p_out_key
      p_new_key <- peek p_out_key
      newForeignHANDLE p_new_key
    foreign import WINDOWS_CCONV unsafe "windows.h RegCreateKeyW"
      c_RegCreateKey :: PKEY -> LPCTSTR -> Ptr PKEY -> IO ErrCode

    type RegCreateOptions = DWORD

    rEG_OPTION_NON_VOLATILE       :: RegCreateOptions
    rEG_OPTION_NON_VOLATILE       =  0
    rEG_OPTION_VOLATILE           :: RegCreateOptions
    rEG_OPTION_VOLATILE           =  1

    {-# LINE 132 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}

    type REGSAM = Word32
    {-# LINE 134 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}

    kEY_ALL_ACCESS        :: REGSAM
    kEY_ALL_ACCESS        =  983103
    kEY_CREATE_LINK       :: REGSAM
    kEY_CREATE_LINK       =  32
    kEY_CREATE_SUB_KEY    :: REGSAM
    kEY_CREATE_SUB_KEY    =  4
    kEY_ENUMERATE_SUB_KEYS  :: REGSAM
    kEY_ENUMERATE_SUB_KEYS  =  8
    kEY_EXECUTE           :: REGSAM
    kEY_EXECUTE           =  131097
    kEY_NOTIFY            :: REGSAM
    kEY_NOTIFY            =  16
    kEY_QUERY_VALUE       :: REGSAM
    kEY_QUERY_VALUE       =  1
    kEY_READ              :: REGSAM
    kEY_READ              =  131097
    kEY_SET_VALUE         :: REGSAM
    kEY_SET_VALUE         =  2
    kEY_WRITE             :: REGSAM
    kEY_WRITE             =  131078

    {-# LINE 147 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}

    regCreateKeyEx :: HKEY -> String -> Maybe String -> RegCreateOptions -> REGSAM -> Maybe LPSECURITY_ATTRIBUTES -> IO (HKEY, Bool)
    regCreateKeyEx key subkey cls opts sam mb_attr =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      maybeWith withTString cls $ \ c_cls ->
      alloca $ \ p_res ->
      alloca $ \ p_disp -> do
      failUnlessSuccess "RegCreateKeyEx" $
        c_RegCreateKeyEx p_key c_subkey 0 c_cls opts sam (maybePtr mb_attr) p_res p_disp
      p_out_key <- peek p_res
      out_key <- newForeignHANDLE p_out_key
      disp <- peek p_disp
      return (out_key, disp == 1)
    {-# LINE 161 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}
    foreign import WINDOWS_CCONV unsafe "windows.h RegCreateKeyExW"
      c_RegCreateKeyEx :: PKEY -> LPCTSTR -> DWORD -> LPCTSTR -> RegCreateOptions -> REGSAM -> LPSECURITY_ATTRIBUTES -> Ptr PKEY -> Ptr DWORD -> IO ErrCode

    regDeleteKey :: HKEY -> String -> IO ()
    regDeleteKey key subkey =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      failUnlessSuccess "RegDeleteKey" $ c_RegDeleteKey p_key c_subkey
    foreign import WINDOWS_CCONV unsafe "windows.h RegDeleteKeyW"
      c_RegDeleteKey :: PKEY -> LPCTSTR -> IO ErrCode

    regDeleteValue :: HKEY -> String -> IO ()
    regDeleteValue key name =
      withForeignPtr key $ \ p_key ->
      withTString name $ \ c_name ->
      failUnlessSuccess "RegDeleteValue" $ c_RegDeleteValue p_key c_name
    foreign import WINDOWS_CCONV unsafe "windows.h RegDeleteValueW"
      c_RegDeleteValue :: PKEY -> LPCTSTR -> IO ErrCode

    -- XXX Not 100% sure this is right, but I think it is.

    -- Surely this function already exists somewhere?

    mallocWideChars :: Int -> IO (Ptr a)
    mallocWideChars i = mallocBytes (4 * i)

    regEnumKeys :: HKEY -> IO [String]
    regEnumKeys hkey = do
       hinfo <- regQueryInfoKey hkey
       let buflen = 1+max_subkey_len hinfo
       buf   <- mallocWideChars (fromIntegral buflen)
       ls    <- go 0 buf buflen
       free buf
       return ls
     where
       go n buf buflen = do
          (v,flg)  <- regEnumKey hkey n buf buflen
          if flg /= 0
           then return []
           else do
             vs <- go (n+1) buf buflen
             return (v:vs)

    regEnumKeyVals :: HKEY -> IO [(String,String,RegValueType)]
    regEnumKeyVals hkey = do
       hinfo <- regQueryInfoKey hkey
       let nmlen  = 1+max_value_name_len hinfo  -- add spc for terminating NUL.

       let vallen = 1+max_value_len hinfo
       nmbuf  <- mallocWideChars (fromIntegral nmlen)
       valbuf <- mallocWideChars (fromIntegral vallen)
       ls     <- go 0 nmbuf nmlen valbuf vallen
       free nmbuf
       free valbuf
       return ls
     where
       go n nmbuf nmlen valbuf vallen = do
          (ty,nm,flg) <- regEnumValue hkey n nmbuf nmlen valbuf vallen
          if flg /= 0
           then return []
           else do

            val <-
               case ty of
                 x | x == rEG_SZ    -> peekTString (castPtr valbuf)
                   | x == rEG_DWORD -> peekElemOff (castPtr valbuf) 0 >>= \ v -> return (show (v :: DWORD))
                   | otherwise      -> return "<<unknown>>"

            vs <- go (n+1) nmbuf nmlen valbuf vallen
            return ((nm,val,ty):vs)

    -- It's up to the programmer to ensure that a large enough

    -- buffer is passed in here.

    regEnumKey :: HKEY -> DWORD -> LPTSTR -> DWORD -> IO (String, Int)
    regEnumKey key index c_name len =
      withForeignPtr key $ \ p_key -> do
      no_more <- failUnlessSuccessOr eRROR_NO_MORE_ITEMS "RegEnumKey" $
        c_RegEnumKey p_key index c_name len
      str <- peekTString c_name
      return (str, fromEnum no_more)
    foreign import WINDOWS_CCONV unsafe "windows.h RegEnumKeyW"
      c_RegEnumKey :: PKEY -> DWORD -> LPTSTR -> DWORD -> IO ErrCode

    regEnumValue :: HKEY -> DWORD -> LPTSTR -> DWORD -> LPBYTE -> DWORD -> IO (RegValueType, String, Int)
    regEnumValue key index name name_len value value_len =
      withForeignPtr key $ \ p_key ->
      with name_len $ \ p_name_len ->
      with value_len $ \ p_value_len ->
      alloca $ \ p_reg_ty -> do
      no_more <- failUnlessSuccessOr eRROR_NO_MORE_ITEMS "RegEnumValue" $
        c_RegEnumValue p_key index name p_name_len nullPtr p_reg_ty value p_value_len
      reg_ty <- peek p_reg_ty
      str <- peekTString name
      return (reg_ty, str, fromEnum no_more)
    foreign import WINDOWS_CCONV unsafe "windows.h RegEnumValueW"
      c_RegEnumValue :: PKEY -> DWORD -> LPTSTR -> Ptr DWORD -> Ptr DWORD -> Ptr DWORD -> LPBYTE -> Ptr DWORD -> IO ErrCode

    eRROR_NO_MORE_ITEMS :: ErrCode
    eRROR_NO_MORE_ITEMS = 259
    {-# LINE 258 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}

    regFlushKey :: HKEY -> IO ()
    regFlushKey key =
      withForeignPtr key $ \ p_key ->
      failUnlessSuccess "RegFlushKey" $ c_RegFlushKey p_key
    foreign import WINDOWS_CCONV unsafe "windows.h RegFlushKey"
      c_RegFlushKey :: PKEY -> IO ErrCode

    -- ifdef FOR_WINDOWS_NT

    -- RegGetKeySecurity :: HKEY -> SECURITY_INFORMATION -> IO SECURITY_DESCRIPTION

    -- endif

    regLoadKey :: HKEY -> String -> String -> IO ()
    regLoadKey key subkey file =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      withTString file $ \ c_file ->
      failUnlessSuccess "RegLoadKey" $ c_RegLoadKey p_key c_subkey c_file
    foreign import WINDOWS_CCONV unsafe "windows.h RegLoadKeyW"
      c_RegLoadKey :: PKEY -> LPCTSTR -> LPCTSTR -> IO ErrCode

    -- ifdef FOR_WINDOWS_NT

    type RegNotifyOptions = DWORD

    rEG_NOTIFY_CHANGE_NAME        :: RegNotifyOptions
    rEG_NOTIFY_CHANGE_NAME        =  1
    rEG_NOTIFY_CHANGE_ATTRIBUTES  :: RegNotifyOptions
    rEG_NOTIFY_CHANGE_ATTRIBUTES  =  2
    rEG_NOTIFY_CHANGE_LAST_SET    :: RegNotifyOptions
    rEG_NOTIFY_CHANGE_LAST_SET    =  4
    rEG_NOTIFY_CHANGE_SECURITY    :: RegNotifyOptions
    rEG_NOTIFY_CHANGE_SECURITY    =  8

    {-# LINE 290 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}

    regNotifyChangeKeyValue :: HKEY -> Bool -> RegNotifyOptions -> HANDLE -> Bool -> IO ()
    regNotifyChangeKeyValue key watch notifyFilter event async =
      withForeignPtr key $ \ p_key ->
      failUnlessSuccess "RegNotifyChangeKeyValue" $
        c_RegNotifyChangeKeyValue p_key watch notifyFilter event async
    foreign import WINDOWS_CCONV unsafe "windows.h RegNotifyChangeKeyValue"
      c_RegNotifyChangeKeyValue :: PKEY -> Bool -> RegNotifyOptions -> HANDLE -> Bool -> IO ErrCode

    -- endif

    -- for Win 3.x compatibility, use RegOpenKeyEx instead.

    regOpenKey :: HKEY -> String -> IO HKEY
    regOpenKey key subkey =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      alloca $ \ p_res -> do
      failUnlessSuccess "RegOpenKey" $ c_RegOpenKey p_key c_subkey p_res
      p_res_key <- peek p_res
      newForeignHANDLE p_res_key
    foreign import WINDOWS_CCONV unsafe "windows.h RegOpenKeyW"
      c_RegOpenKey :: PKEY -> LPCTSTR -> Ptr PKEY -> IO ErrCode

    regOpenKeyEx :: HKEY -> String -> REGSAM -> IO HKEY
    regOpenKeyEx key subkey sam =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      alloca $ \ p_res -> do
      failUnlessSuccess "RegOpenKeyEx" $ c_RegOpenKeyEx p_key c_subkey 0 sam p_res
      p_res_key <- peek p_res
      newForeignHANDLE p_res_key
    foreign import WINDOWS_CCONV unsafe "windows.h RegOpenKeyExW"
      c_RegOpenKeyEx :: PKEY -> LPCTSTR -> DWORD -> REGSAM -> Ptr PKEY -> IO ErrCode

    data RegInfoKey =
      RegInfoKey {
        class_string       :: String,
        class_id           :: Int,
        subkeys            :: Word32,
        max_subkey_len     :: Word32,
        max_class_len      :: Word32,
        values             :: Word32,
        max_value_name_len :: Word32,
        max_value_len      :: Word32,
        sec_len            :: Int,
        lastWrite_lo       :: Word32,
        lastWrite_hi       :: Word32
      }

    regQueryInfoKey :: HKEY -> IO RegInfoKey
    regQueryInfoKey key =
      withForeignPtr key $ \ p_key ->
      allocaBytes 100 $ \ c_class_string ->
      alloca $ \ p_class_id ->
      alloca $ \ p_subkeys ->
      alloca $ \ p_max_subkey_len ->
      alloca $ \ p_max_class_len ->
      alloca $ \ p_values ->
      alloca $ \ p_max_value_name_len ->
      alloca $ \ p_max_value_len ->
      alloca $ \ p_sec_len ->
      allocaBytes ((8)) $ \ p_lastWrite -> do
    {-# LINE 353 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}
      failUnlessSuccess "RegQueryInfoKey" $
        c_RegQueryInfoKey p_key c_class_string p_class_id nullPtr p_subkeys
            p_max_subkey_len p_max_class_len p_values p_max_value_name_len
            p_max_value_len p_sec_len p_lastWrite
      class_string' <- peekTString c_class_string
      class_id' <- peek p_class_id
      subkeys' <- peek p_subkeys
      max_subkey_len' <- peek p_max_subkey_len
      max_class_len' <- peek p_max_class_len
      values' <- peek p_values
      max_value_name_len' <- peek p_max_value_name_len
      max_value_len' <- peek p_max_value_len
      sec_len' <- peek p_sec_len
      lastWrite_lo' <- (\hsc_ptr -> peekByteOff hsc_ptr 0) p_lastWrite
    {-# LINE 367 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}
      lastWrite_hi' <- (\hsc_ptr -> peekByteOff hsc_ptr 4) p_lastWrite
    {-# LINE 368 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}
      return $ RegInfoKey
        { class_string = class_string'
        , class_id = fromIntegral class_id'
        , subkeys = subkeys'
        , max_subkey_len = max_subkey_len'
        , max_class_len = max_class_len'
        , values = values'
        , max_value_name_len = max_value_name_len'
        , max_value_len = max_value_len'
        , sec_len = fromIntegral sec_len'
        , lastWrite_lo = lastWrite_lo'
        , lastWrite_hi = lastWrite_hi'
        }
    foreign import WINDOWS_CCONV unsafe "windows.h RegQueryInfoKeyW"
      c_RegQueryInfoKey :: PKEY -> LPTSTR -> Ptr DWORD -> Ptr DWORD -> Ptr DWORD -> Ptr DWORD -> Ptr DWORD -> Ptr DWORD -> Ptr DWORD -> Ptr DWORD -> Ptr DWORD -> Ptr FILETIME -> IO ErrCode

    -- RegQueryMultipleValues :: HKEY -> IO ([VALENT],String)

    {-# DEPRECATED regQueryValueKey "Use regQueryValue instead." #-}
    regQueryValueKey :: HKEY -> Maybe String -> IO String
    regQueryValueKey key mb_subkey =
      withForeignPtr key $ \ p_key ->
      maybeWith withTString mb_subkey $ \ c_subkey ->
      alloca $ \ p_value_len -> do
      failUnlessSuccess "RegQueryValueKey" $
        c_RegQueryValue p_key c_subkey nullPtr p_value_len
      value_len <- peek p_value_len
      allocaArray0 (fromIntegral value_len) $ \ c_value -> do
        failUnlessSuccess "RegQueryValueKey" $
          c_RegQueryValue p_key c_subkey c_value p_value_len
        peekTString c_value

    regQueryValue :: HKEY -> Maybe String -> IO String
    regQueryValue key mb_subkey =
      withForeignPtr key $ \ p_key ->
      maybeWith withTString mb_subkey $ \ c_subkey ->
      alloca $ \ p_value_len -> do
      failUnlessSuccess "RegQueryValue" $
        c_RegQueryValue p_key c_subkey nullPtr p_value_len
      value_len <- peek p_value_len
      allocaArray0 (fromIntegral value_len) $ \ c_value -> do
        failUnlessSuccess "RegQueryValue" $
          c_RegQueryValue p_key c_subkey c_value p_value_len
        peekTString c_value
    foreign import WINDOWS_CCONV unsafe "windows.h RegQueryValueW"
      c_RegQueryValue :: PKEY -> LPCTSTR -> LPTSTR -> Ptr LONG -> IO ErrCode

    -- Gets the data associated with the default value of a key (assumed to be of

    -- type REG_SZ) using RegQeryValueEx.

    regQueryDefaultValue :: HKEY -> String -> IO String
    regQueryDefaultValue key mb_subkey =
      withForeignPtr key $ \ p_key ->
      withTString mb_subkey $ \ c_subkey ->
      alloca $ \ p_ty ->
      alloca $ \ p_value_len -> do
      failUnlessSuccess "regQueryDefaultValue" $
        c_RegQueryValueEx p_key c_subkey nullPtr p_ty nullPtr p_value_len
      ty <- peek p_ty
      failUnlessSuccess "regQueryDefaultValue" $ return (if ty == rEG_SZ then 0 else 1)
      value_len <- peek p_value_len
      allocaArray0 (fromIntegral value_len) $ \ c_value -> do
        failUnlessSuccess "regQueryDefaultValue" $
          c_RegQueryValueEx p_key c_subkey nullPtr p_ty c_value p_value_len
        peekTString (castPtr c_value)

    regQueryValueEx :: HKEY -> String -> LPBYTE -> Int -> IO RegValueType
    regQueryValueEx key name value value_len =
      withForeignPtr key $ \ p_key ->
      withTString name $ \ c_name ->
      alloca $ \ p_ty ->
      with (fromIntegral value_len) $ \ p_value_len -> do
      failUnlessSuccess "RegQueryValueEx" $
        c_RegQueryValueEx p_key c_name nullPtr p_ty value p_value_len
      peek p_ty
    foreign import WINDOWS_CCONV unsafe "windows.h RegQueryValueExW"
      c_RegQueryValueEx :: PKEY -> LPCTSTR -> Ptr DWORD -> Ptr DWORD -> LPBYTE -> Ptr DWORD -> IO ErrCode

    regReplaceKey :: HKEY -> Maybe String -> String -> String -> IO ()
    regReplaceKey key subkey newfile oldfile =
      withForeignPtr key $ \ p_key ->
      maybeWith withTString subkey $ \ c_subkey ->
      withTString newfile $ \ c_newfile ->
      withTString oldfile $ \ c_oldfile ->
      failUnlessSuccess "RegReplaceKey" $
        c_RegReplaceKey p_key c_subkey c_newfile c_oldfile
    foreign import WINDOWS_CCONV unsafe "windows.h RegReplaceKeyW"
      c_RegReplaceKey :: PKEY -> LPCTSTR -> LPCTSTR -> LPCTSTR -> IO ErrCode

    type RegRestoreFlags = DWORD

    rEG_WHOLE_HIVE_VOLATILE  :: RegRestoreFlags
    rEG_WHOLE_HIVE_VOLATILE  =  1
    rEG_REFRESH_HIVE      :: RegRestoreFlags
    rEG_REFRESH_HIVE      =  2
    rEG_NO_LAZY_FLUSH     :: RegRestoreFlags
    rEG_NO_LAZY_FLUSH     =  4

    {-# LINE 463 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}

    regRestoreKey :: HKEY -> String -> RegRestoreFlags -> IO ()
    regRestoreKey key file flags =
      withForeignPtr key $ \ p_key ->
      withTString file $ \ c_file ->
      failUnlessSuccess "RegRestoreKey" $ c_RegRestoreKey p_key c_file flags
    foreign import WINDOWS_CCONV unsafe "windows.h RegRestoreKeyW"
      c_RegRestoreKey :: PKEY -> LPCTSTR -> RegRestoreFlags -> IO ErrCode

    regSaveKey :: HKEY -> String -> Maybe LPSECURITY_ATTRIBUTES -> IO ()
    regSaveKey key file mb_attr =
      withForeignPtr key $ \ p_key ->
      withTString file $ \ c_file ->
      failUnlessSuccess "RegSaveKey" $ c_RegSaveKey p_key c_file (maybePtr mb_attr)
    foreign import WINDOWS_CCONV unsafe "windows.h RegSaveKeyW"
      c_RegSaveKey :: PKEY -> LPCTSTR -> LPSECURITY_ATTRIBUTES -> IO ErrCode

    -- ifdef FOR_WINDOWS_NT

    -- RegSetKeySecurity :: HKEY -> SECURITY_INFORMATION -> SECURITY_DESCRIPTOR -> IO ()

    -- endif

    -- 3.1 compat. - only allows storage of REG_SZ values.

    regGetValue :: HKEY -> Maybe String -> Maybe String -> RegTypeRestriction -> Maybe LPDWORD -> Maybe LPVOID -> Maybe LPDWORD -> IO ()
    regGetValue key m_subkey m_valuename flags m_type m_value m_size =
      withForeignPtr key $ \ p_key ->
      maybeWith withTString m_subkey $ \ c_subkey ->
      maybeWith withTString m_valuename $ \ c_valuename ->
      failUnlessSuccess "RegGetValue" $
        c_RegGetValue p_key c_subkey c_valuename flags (maybePtr m_type) (maybePtr m_value) (maybePtr m_size)
    foreign import WINDOWS_CCONV unsafe "windows.h RegGetValueW"
      c_RegGetValue :: PKEY -> LPCTSTR -> LPCTSTR -> DWORD -> LPDWORD -> LPVOID -> LPDWORD -> IO ErrCode

    type RegTypeRestriction = DWORD

    rRF_RT_ANY             :: RegTypeRestriction
    rRF_RT_ANY             =  65535
    rRF_RT_DWORD           :: RegTypeRestriction
    rRF_RT_DWORD           =  24
    rRF_RT_QWORD           :: RegTypeRestriction
    rRF_RT_QWORD           =  72
    rRF_RT_REG_BINARY      :: RegTypeRestriction
    rRF_RT_REG_BINARY      =  8
    rRF_RT_REG_DWORD       :: RegTypeRestriction
    rRF_RT_REG_DWORD       =  16
    rRF_RT_REG_EXPAND_SZ   :: RegTypeRestriction
    rRF_RT_REG_EXPAND_SZ   =  4
    rRF_RT_REG_MULTI_SZ    :: RegTypeRestriction
    rRF_RT_REG_MULTI_SZ    =  32
    rRF_RT_REG_NONE        :: RegTypeRestriction
    rRF_RT_REG_NONE        =  1
    rRF_RT_REG_QWORD       :: RegTypeRestriction
    rRF_RT_REG_QWORD       =  64
    rRF_RT_REG_SZ          :: RegTypeRestriction
    rRF_RT_REG_SZ          =  2
    rRF_NOEXPAND           :: RegTypeRestriction
    rRF_NOEXPAND           =  268435456
    rRF_ZEROONFAILURE      :: RegTypeRestriction
    rRF_ZEROONFAILURE      =  536870912
    rRF_SUBKEY_WOW6464KEY  :: RegTypeRestriction
    rRF_SUBKEY_WOW6464KEY  =  65536
    rRF_SUBKEY_WOW6432KEY  :: RegTypeRestriction
    rRF_SUBKEY_WOW6432KEY  =  131072

    {-# LINE 516 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}

    regSetValue :: HKEY -> String -> String -> IO ()
    regSetValue key subkey value =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      withTString value $ \ c_value ->
      failUnlessSuccess "RegSetValue" $
        c_RegSetValue p_key c_subkey rEG_SZ c_value 0 -- cbData is ignored, value needs to be null terminated.

    foreign import WINDOWS_CCONV unsafe "windows.h RegSetValueW"
      c_RegSetValue :: PKEY -> LPCTSTR -> DWORD -> LPCTSTR -> Int -> IO ErrCode

    type RegValueType = DWORD

    rEG_BINARY            :: RegValueType
    rEG_BINARY            =  3
    rEG_DWORD             :: RegValueType
    rEG_DWORD             =  4
    rEG_DWORD_LITTLE_ENDIAN  :: RegValueType
    rEG_DWORD_LITTLE_ENDIAN  =  4
    rEG_DWORD_BIG_ENDIAN  :: RegValueType
    rEG_DWORD_BIG_ENDIAN  =  5
    rEG_EXPAND_SZ         :: RegValueType
    rEG_EXPAND_SZ         =  2
    rEG_LINK              :: RegValueType
    rEG_LINK              =  6
    rEG_MULTI_SZ          :: RegValueType
    rEG_MULTI_SZ          =  7
    rEG_NONE              :: RegValueType
    rEG_NONE              =  0
    rEG_RESOURCE_LIST     :: RegValueType
    rEG_RESOURCE_LIST     =  8
    rEG_SZ                :: RegValueType
    rEG_SZ                =  1

    {-# LINE 542 "libraries\\Win32\\System\\Win32\\Registry.hsc" #-}

    -- regSetValueEx has a somewhat wieldly interface if all you want to do is

    -- add a string value (a Common Thing to want to do), so we support this

    -- specially:

    regSetStringValue :: HKEY -> String -> String -> IO ()
    regSetStringValue hk key val =
      withTString val $ \ v ->
      regSetValueEx hk key rEG_SZ v ((1+length val) * sizeOf (undefined::TCHAR))

    regSetValueEx :: HKEY -> String -> RegValueType -> LPTSTR -> Int -> IO ()
    regSetValueEx key subkey ty value value_len =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      failUnlessSuccess "RegSetValueEx" $
        c_RegSetValueEx p_key c_subkey 0 ty value value_len
    foreign import WINDOWS_CCONV unsafe "windows.h RegSetValueExW"
      c_RegSetValueEx :: PKEY -> LPCTSTR -> DWORD -> RegValueType -> LPTSTR -> Int -> IO ErrCode

    regUnLoadKey :: HKEY -> String -> IO ()
    regUnLoadKey key subkey =
      withForeignPtr key $ \ p_key ->
      withTString subkey $ \ c_subkey ->
      failUnlessSuccess "RegUnLoadKey" $ c_RegUnLoadKey p_key c_subkey
    foreign import WINDOWS_CCONV unsafe "windows.h RegUnLoadKeyW"
      c_RegUnLoadKey :: PKEY -> LPCTSTR -> IO ErrCode