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-- |
-- Copyright : (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
-- License : MIT
-- Maintainer : Egor.Tensin@gmail.com
-- Stability : experimental
--
-- Low-level utility functions for reading and writing registry values.
module Windows.Registry
( IsKeyPath(..)
, RootKey(..)
, KeyPath(..)
, ValueName
, ValueType
, ValueData
, open
, close
, deleteValue
, queryValue
, getValue
, getExpandedString
, setValue
, setString
, setExpandableString
) where
import Data.Bits ((.|.))
import qualified Data.ByteString as B
import Data.List (intercalate)
import qualified Data.Text as T
import Data.Text.Encoding (decodeUtf16LE, encodeUtf16LE)
import Control.Exception (bracket)
import Foreign.ForeignPtr (withForeignPtr)
import Foreign.Marshal.Alloc (alloca, allocaBytes)
import Foreign.Marshal.Array (peekArray, pokeArray)
import Foreign.Storable (peek, poke)
import System.IO.Error (catchIOError)
import qualified System.Win32.Types as WinAPI
import qualified System.Win32.Registry as WinAPI
type Handle = WinAPI.HKEY
class IsKeyPath a where
openUnsafe :: a -> IO Handle
close :: Handle -> IO ()
close h = WinAPI.regCloseKey h
open :: IsKeyPath a => a -> IO (Either IOError Handle)
open a = catchIOError (fmap Right $ openUnsafe a) $ return . Left
data RootKey = CurrentUser
| LocalMachine
deriving (Eq)
instance IsKeyPath RootKey where
openUnsafe CurrentUser = return WinAPI.hKEY_CURRENT_USER
openUnsafe LocalMachine = return WinAPI.hKEY_LOCAL_MACHINE
instance Show RootKey where
show CurrentUser = "HKCU"
show LocalMachine = "HKLM"
data KeyPath = KeyPath RootKey [String]
pathSep :: String
pathSep = "\\"
instance IsKeyPath KeyPath where
openUnsafe (KeyPath root path) = do
rootHandle <- openUnsafe root
WinAPI.regOpenKey rootHandle $ intercalate pathSep path
instance Show KeyPath where
show (KeyPath root path) = intercalate pathSep $ show root : path
type ValueName = String
type ValueType = WinAPI.DWORD
type ValueData = (ValueType, B.ByteString)
encodeString :: String -> B.ByteString
encodeString = encodeUtf16LE . T.pack
decodeString :: ValueData -> String
decodeString (_, valueData) = T.unpack . decodeUtf16LE $ valueData
openCloseCatch :: IsKeyPath a => a -> (Handle -> IO b) -> IO (Either IOError b)
openCloseCatch keyPath f = catchIOError (fmap Right openClose) $ return . Left
where
openClose = bracket (openUnsafe keyPath) close f
foreign import ccall unsafe "Windows.h RegQueryValueExW"
c_RegQueryValueEx :: WinAPI.PKEY -> WinAPI.LPCTSTR -> WinAPI.LPDWORD -> WinAPI.LPDWORD -> WinAPI.LPBYTE -> WinAPI.LPDWORD -> IO WinAPI.ErrCode
foreign import ccall unsafe "Windows.h RegSetValueExW"
c_RegSetValueEx :: WinAPI.PKEY -> WinAPI.LPCTSTR -> WinAPI.DWORD -> WinAPI.DWORD -> WinAPI.LPBYTE -> WinAPI.DWORD -> IO WinAPI.ErrCode
foreign import ccall unsafe "Windows.h RegGetValueW"
c_RegGetValue :: WinAPI.PKEY -> WinAPI.LPCTSTR -> WinAPI.LPCTSTR -> WinAPI.DWORD -> WinAPI.LPDWORD -> WinAPI.LPBYTE -> WinAPI.LPDWORD -> IO WinAPI.ErrCode
queryValue :: IsKeyPath a => a -> ValueName -> IO (Either IOError ValueData)
queryValue keyPath valueName =
openCloseCatch keyPath $ \keyHandle ->
withForeignPtr keyHandle $ \keyHandlePtr ->
WinAPI.withTString valueName $ \valueNamePtr ->
alloca $ \dataSizePtr -> do
poke dataSizePtr 0
WinAPI.failUnlessSuccess "RegQueryValueExW" $ c_RegQueryValueEx keyHandlePtr valueNamePtr WinAPI.nullPtr WinAPI.nullPtr WinAPI.nullPtr dataSizePtr
dataSize <- fmap fromIntegral $ peek dataSizePtr
alloca $ \dataTypePtr -> do
allocaBytes dataSize $ \bufferPtr -> do
WinAPI.failUnlessSuccess "RegQueryValueExW" $ c_RegQueryValueEx keyHandlePtr valueNamePtr WinAPI.nullPtr dataTypePtr bufferPtr dataSizePtr
buffer <- peekArray dataSize bufferPtr
dataType <- peek dataTypePtr
return (dataType, B.pack buffer)
getValue :: IsKeyPath a => a -> ValueName -> [ValueType] -> IO (Either IOError ValueData)
getValue keyPath valueName allowedTypes =
openCloseCatch keyPath $ \keyHandle ->
withForeignPtr keyHandle $ \keyHandlePtr ->
WinAPI.withTString valueName $ \valueNamePtr ->
alloca $ \dataTypePtr ->
alloca $ \dataSizePtr -> do
poke dataSizePtr 0
let flags = foldr (.|.) 0 allowedTypes
WinAPI.failUnlessSuccess "RegGetValueW" $ c_RegGetValue keyHandlePtr WinAPI.nullPtr valueNamePtr flags dataTypePtr WinAPI.nullPtr dataSizePtr
dataSize <- fmap fromIntegral $ peek dataSizePtr
allocaBytes dataSize $ \bufferPtr -> do
WinAPI.failUnlessSuccess "RegGetValueW" $ c_RegGetValue keyHandlePtr WinAPI.nullPtr valueNamePtr flags dataTypePtr bufferPtr dataSizePtr
buffer <- peekArray dataSize bufferPtr
dataType <- peek dataTypePtr
return (dataType, B.pack buffer)
getExpandedString :: IsKeyPath a => a -> ValueName -> IO (Either IOError String)
getExpandedString keyPath valueName = do
valueData <- getValue keyPath valueName [WinAPI.rEG_SZ, WinAPI.rEG_EXPAND_SZ]
return $ fmap decodeString valueData
setValue :: IsKeyPath a => a -> ValueName -> ValueData -> IO (Either IOError ())
setValue keyPath valueName (valueType, valueData) =
openCloseCatch keyPath $ \keyHandle ->
withForeignPtr keyHandle $ \keyHandlePtr ->
WinAPI.withTString valueName $ \valueNamePtr -> do
let buffer = B.unpack valueData
let dataSize = B.length valueData
allocaBytes dataSize $ \bufferPtr -> do
pokeArray bufferPtr buffer
WinAPI.failUnlessSuccess "RegSetValueExW" $ c_RegSetValueEx keyHandlePtr valueNamePtr 0 valueType bufferPtr (fromIntegral dataSize)
setString :: IsKeyPath a => a -> ValueName -> String -> IO (Either IOError ())
setString keyPath valueName valueData =
setValue keyPath valueName (WinAPI.rEG_SZ, encodeString valueData)
setExpandableString :: IsKeyPath a => a -> ValueName -> String -> IO (Either IOError ())
setExpandableString keyPath valueName valueData =
setValue keyPath valueName (WinAPI.rEG_EXPAND_SZ, encodeString valueData)
deleteValue :: IsKeyPath a => a -> ValueName -> IO (Either IOError ())
deleteValue keyPath valueName =
openCloseCatch keyPath $ \keyHandle ->
withForeignPtr keyHandle $ \keyHandlePtr ->
WinAPI.withTString valueName $ \valueNamePtr -> do
WinAPI.failUnlessSuccess "RegDeleteValueW" $ WinAPI.c_RegDeleteValue keyHandlePtr valueNamePtr
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