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-rw-r--r--src/WindowsUtils.hs28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/WindowsUtils.hs b/src/WindowsUtils.hs
new file mode 100644
index 0000000..6fa1f0e
--- /dev/null
+++ b/src/WindowsUtils.hs
@@ -0,0 +1,28 @@
+{-
+ - Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
+ - This file is licensed under the terms of the MIT License.
+ - See LICENSE.txt for details.
+-}
+
+module WindowsUtils
+ ( notifyEnvironmentUpdate
+ ) where
+
+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 "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