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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 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 $ \keyPtr ->
withTString valueName $ \valueNamePtr ->
alloca $ \typePtr -> do
ret <- c_RegQueryValueEx keyPtr valueNamePtr nullPtr typePtr nullPtr nullPtr
case ret of
0x0 -> do
type' <- peek typePtr
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 $ \keyPtr ->
withTString valueName $ \valueNamePtr ->
alloca $ \dataSizePtr -> do
poke dataSizePtr 0
ret <- c_RegQueryValueEx keyPtr valueNamePtr 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 keyPtr valueNamePtr 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 $ \ptr -> do
type' <- getType key subKeyPath valueName
regSetValueEx subKey valueName (fromMaybe rEG_SZ type') ptr $ (length valueValue + 1) * sizeOf (undefined :: TCHAR)
notifyEnvironmentUpdate
foreign import ccall "BroadcastSystemMessageW"
c_BroadcastSystemMessage :: DWORD -> LPDWORD -> UINT -> WPARAM -> LPARAM -> IO LONG
notifyEnvironmentUpdate :: IO ()
notifyEnvironmentUpdate =
withTString "Environment" $ \lparamPtr -> do
let wparam = fromIntegral $ castPtrToUINTPtr nullPtr
let lparam = fromIntegral $ castPtrToUINTPtr lparamPtr
c_BroadcastSystemMessage bSF_POSTMESSAGE nullPtr wM_SETTINGCHANGE wparam lparam
return ()
where
bSF_POSTMESSAGE = 0x10
wM_SETTINGCHANGE = 0x1A
delValue :: HKEY -> String -> String -> IO ()
delValue key subKeyPath valueName =
bracket (regOpenKey key subKeyPath) regCloseKey $ \subKey ->
withForeignPtr subKey $ \subKeyPtr ->
withTString valueName $ \valueNamePtr -> do
ret <- c_RegDeleteValue subKeyPtr valueNamePtr
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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