The Win32-services package
This package provides a partial binding to the Win32 System Services API. It makes it easy to write Windows service applications using Haskell. _Only 32-bit versions of GHC are supported at this time._
The binding is partial. Here are a few ways in which it differs from the official API:
Only services running within their own process are supported. These are processes of the WIN32_OWN_PROCESS type.
In cases where multiple versions of the same function exist (for compatibility), this binding only offers one of them.
None of the extended control codes are supported. Handlers you write will automatically report this to the operating system when such controls are received.
Only facilities for writing services are supported; not controlling them.
Effort has been made to simplify using the API without hiding what is happening behind the scenes. Users are encouraged to read Microsoft's documentation under 'Dev Center - Desktop > Docs > Desktop app development documentation > System Services > Services'. The official example has been ported to Haskell. This can be found in the examples directory of the source tree.
Simple Example and Usage
module Main where import Control.Concurrent.MVar import System.Win32.Services main = do mStop <- newEmptyMVar startServiceCtrlDispatcher "Test" 3000 (handler mStop) $ \_ _ h -> do setServiceStatus h running takeMVar mStop setServiceStatus h stopped handler mStop hStatus Stop = do setServiceStatus hStatus stopPending putMVar mStop () return True handler _ _ Interrogate = return True handler _ _ _ = return False running = ServiceStatus Win32OwnProcess Running [AcceptStop] nO_ERROR 0 0 0 stopped = ServiceStatus Win32OwnProcess Stopped  nO_ERROR 0 0 0 stopPending = ServiceStatus Win32OwnProcess StopPending [AcceptStop] nO_ERROR 0 0 0
C:programmingtest>ghc --make -threaded Main.hs [1 of 1] Compiling Main ( Main.hs, Main.o ) Linking Main.exe ... <linker warnings omitted> C:\programming\test>copy Main.exe c:\svc\Test.exe 1 file(s) copied.
Execute the following from an elevated command prompt to register the service:
C:\svc>sc create Test binPath= c:\svc\Test.exe [SC] CreateService SUCCESS
The service can now be started and stopped from the services console.
Depending on which version of Windows and the Windows SDK you are using the .cabal file will need to be modified before installing. A simple `cabal install Win32-services` may not work. For example, If you are building on Windows 8 64-bit with the Windows 8 SDK the extra-lib-dirs field will need to be changed to read as follows:
Extra-Lib-Dirs: "C:\\Program Files (x86)\\Windows Kits\\8.0\\Lib\\win8\\um\\x86"
|Versions||0.1, 0.2, 0.2.1, 0.2.2, 0.2.2.1, 0.2.3, 0.2.3.1, 0.2.4, 0.2.5, 0.2.5.1, 0.3 (info)|
|Dependencies||base (>=4.5 && <4.9), Win32 (>=2.2 && <2.4), Win32-errors (==0.2.*) [details]|
|Copyright||Copyright 2011-2015 Michael Steele|
|Maintainer||Michael Steele <email@example.com>|
|Source repository||head: git clone git://github.com/mikesteele81/win32-services.git|
|Uploaded||Mon May 25 21:37:04 UTC 2015 by MichaelSteele|
|Downloads||2461 total (16 in the last 30 days)|
|Status||Docs uploaded by user
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