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authorEgor Tensin <Egor.Tensin@gmail.com>2017-01-25 05:58:46 +0300
committerEgor Tensin <Egor.Tensin@gmail.com>2017-01-25 05:58:46 +0300
commitd3e2eeb7892e132120174de5567d932d83c97218 (patch)
treede2fa96af0f64764e7abf7b9482078e19502bae9 /src/WindowsEnv/Utils.hs
parentadd Portability to module descriptions (diff)
downloadwindows-env-d3e2eeb7892e132120174de5567d932d83c97218.tar.gz
windows-env-d3e2eeb7892e132120174de5567d932d83c97218.zip
rename namespace 'Windows' to 'WindowsEnv'
Diffstat (limited to 'src/WindowsEnv/Utils.hs')
-rw-r--r--src/WindowsEnv/Utils.hs30
1 files changed, 30 insertions, 0 deletions
diff --git a/src/WindowsEnv/Utils.hs b/src/WindowsEnv/Utils.hs
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+-- |
+-- Copyright : (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+-- License : MIT
+-- Maintainer : Egor.Tensin@gmail.com
+-- Stability : experimental
+-- Portability : Windows-only
+
+module WindowsEnv.Utils
+ ( notifyEnvironmentUpdate
+ ) where
+
+import Foreign.C.Types (CIntPtr(..))
+import qualified Graphics.Win32.GDI.Types as WinAPI
+import qualified Graphics.Win32.Message as WinAPI
+import qualified System.Win32.Types as WinAPI
+
+foreign import ccall "Windows.h SendNotifyMessageW"
+ c_SendNotifyMessage :: WinAPI.HWND -> WinAPI.WindowMessage -> WinAPI.WPARAM -> WinAPI.LPARAM -> IO WinAPI.LRESULT
+
+notifyEnvironmentUpdate :: IO ()
+notifyEnvironmentUpdate =
+ WinAPI.withTString "Environment" $ \lparamPtr -> do
+ let wparam = 0
+ let lparam = fromIntegral $ WinAPI.castPtrToUINTPtr lparamPtr
+ _ <- c_SendNotifyMessage allWindows messageCode wparam lparam
+ return ()
+ where
+ messageCode = WinAPI.wM_WININICHANGE
+ hWND_BROADCAST = WinAPI.castUINTPtrToPtr 0xffff
+ allWindows = hWND_BROADCAST