Just a template of Windows Service, packaged as a dynamic library (DLL). Why, I hear you ask? Well I wanted to know if that could work. The answer is yes.
Actual work goes into DoWork(argc, argv). The example will just loop and wait for a stop request.
Service can be installed using rundll32.exe .\minimal_service.dll,InstallService (or sc create MySvcDll binPath= C:\Windows\System32\rundll32.exe "C:\...\minimal_service.dll",RunService)
The service can then be run using sc start MySvc (it will log to the szLogPath file), or interactively using rundll32.exe .\minimal_service.dll,RunInteractive