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{-
- Copyright 2015 Egor Tensin <Egor.Tensin@gmail.com>
- This file is licensed under the terms of the MIT License.
- See LICENSE.txt for details.
-}
module RegUtils ( delValue
, getString
, hkcu
, hklm
, setString ) where
import Control.Exception ( bracket )
import Data.Maybe ( fromMaybe )
import Foreign.ForeignPtr ( withForeignPtr )
import Foreign.Marshal.Alloc ( alloca, allocaBytes )
import Foreign.Ptr ( castPtr, plusPtr )
import Foreign.Storable ( peek, poke, sizeOf )
import Graphics.Win32.Window ( sendMessage )
import System.IO.Error ( mkIOError, doesNotExistErrorType )
import System.Win32.Types
import System.Win32.Registry
getType :: HKEY -> String -> String -> IO (Maybe RegValueType)
getType key subKeyPath valueName =
bracket (regOpenKey key subKeyPath) regCloseKey $ \key ->
withForeignPtr key $ \p_key ->
withTString valueName $ \p_valueName ->
alloca $ \p_type -> do
ret <- c_RegQueryValueEx p_key p_valueName nullPtr p_type nullPtr nullPtr
case ret of
0x0 -> do
type_ <- peek p_type
return $ Just type_
0x2 -> return Nothing
_ -> failWith "RegQueryValueEx" ret
getString :: HKEY -> String -> String -> IO String
getString key subKeyPath valueName =
bracket (regOpenKey key subKeyPath) regCloseKey $ \key ->
withForeignPtr key $ \p_key ->
withTString valueName $ \p_valueName ->
alloca $ \dataSizePtr -> do
poke dataSizePtr 0
ret <- c_RegQueryValueEx p_key p_valueName nullPtr nullPtr nullPtr dataSizePtr
case ret of
0x0 -> do
dataSize <- peek dataSizePtr
let newDataSize = dataSize + fromIntegral (sizeOf (undefined :: TCHAR))
poke dataSizePtr newDataSize
allocaBytes (fromIntegral newDataSize) $ \dataPtr -> do
poke (castPtr $ plusPtr dataPtr $ fromIntegral dataSize) '\0'
failUnlessSuccess "RegQueryValueEx" $
c_RegQueryValueEx p_key p_valueName nullPtr nullPtr dataPtr dataSizePtr
peekTString $ castPtr dataPtr
0x2 -> ioError $ mkIOError doesNotExistErrorType "RegQueryValueEx" Nothing $ Just (subKeyPath ++ "\\" ++ valueName)
_ -> failWith "RegQueryValueEx" ret
setString :: HKEY -> String -> String -> String -> IO ()
setString key subKeyPath valueName valueValue =
bracket (regOpenKey key subKeyPath) regCloseKey $ \subKey ->
withTString valueValue $ \p_valueValue -> do
type_ <- getType key subKeyPath valueName
regSetValueEx subKey valueName (fromMaybe rEG_SZ type_) p_valueValue $ (length valueValue + 1) * sizeOf (undefined :: TCHAR)
notifyEnvironmentUpdate
notifyEnvironmentUpdate :: IO ()
notifyEnvironmentUpdate =
withTString "Environment" $ \p_lparam -> do
let wparam = 0
let lparam = fromIntegral $ castPtrToUINTPtr p_lparam
let hwnd = castUINTPtrToPtr 0xffff
sendMessage hwnd wM_SETTINGCHANGE wparam lparam
return ()
where
wM_SETTINGCHANGE = 0x1A
delValue :: HKEY -> String -> String -> IO ()
delValue key subKeyPath valueName =
bracket (regOpenKey key subKeyPath) regCloseKey $ \subKey ->
withForeignPtr subKey $ \subKeyPtr ->
withTString valueName $ \p_valueName -> do
ret <- c_RegDeleteValue subKeyPtr p_valueName
notifyEnvironmentUpdate
case ret of
0x0 -> return ()
0x2 -> ioError $ mkIOError doesNotExistErrorType "RegQueryValueEx" Nothing $ Just (subKeyPath ++ "\\" ++ valueName)
_ -> failWith "RegDeleteValue" ret
hkcu = hKEY_CURRENT_USER
hklm = hKEY_LOCAL_MACHINE
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