Win32-services: Windows service applications

This package provides a partial binding to the Win32 System Services API. It's now possible to write Windows service applications using Haskell.

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.SystemServices.Services

main = startServiceCtrlDispatcher "Test" $ name _ -> do
    mStop <- newEmptyMVar
    hStatus <- registerServiceCtrlHandlerEx name $ handler mStop
    setServiceStatus hStatus running
    takeMVar mStop
    setServiceStatus hStatus stopped

handler mStop hStatus STOP = do
    setServiceStatus hStatus stopPending
    putMVar mStop ()
    return True
handler _ _ INTERROGATE = return True
handler _ _ _           = return False

stopped = SERVICE_STATUS WIN32_OWN_PROCESS STOPPED [] nO_ERROR 0 0 0
stopPending = stopped { currentState = STOP_PENDING
                      , waitHint = 3000 }
running = stopped { currentState = RUNNING
                  , controlsAccepted = [ACCEPT_STOP] }

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.

Modules

[Last Documentation]

Downloads

• Win32-services-0.1.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

Maintainer's Corner

Package maintainers

• MichaelSteele, gussen

For package maintainers and hackage trustees

• edit package information

Candidates

• 0.4, 0.4.0.1