Session 2
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The document discusses Windows services, their architecture, and how to create a basic Windows service program. It explains that Windows services allow applications to run without a user logged in and outlines the key components needed - the service program, service control manager, and service configuration program. It provides code examples for implementing the main entry point of a service program and handlers for start and stop requests.
Session 2
- 1. Session 2 Windows Services
- 2. Session Objectives Explain Windows Services & its architecture Explain the Service Control Manager Create a Windows Service Program Discuss the service configuration program
- 3. Windows Services (1) Applications require user interaction to get them started IIS (Internet Information Server) automatically starts without the user logging into the system Windows service can run without any user logging in
- 4. Windows Services (2) To execute Windows Services, you need the Windows NT Kernel The Windows NT Kernel is available only in Windows NT/ 2000/ XP It is not available on systems running Windows 95/ 98/ Me
- 5. Windows Services MMC (1) Windows Services can be monitored using the Windows 2000 Services MMC In Windows NT, the Services option is found in the Control Panel
- 6. Windows Services MMC (2) The MMC for services looks something like -
- 7. Windows Services - Architecture(1) Three types of programs are required to operate a service - Service Program Service Control Program Service Configuration Program
- 8. Windows Services - Architecture (2) Graphical Representation -
- 9. The Service Program Service program contains logic of Windows Service A service program might contain code for more than one Windows Service The service program must have an entry point i.e. the Main() method
- 10. Service Control Manager (1) Windows Services need to be registered with the Service Control Manager The entry point – Main() method takes care of the registration process The Main() method is called automatically at boot time if the windows service is configured to start automatically
- 11. Service Control Manager (2) The service program should also implement handlers The handler of the service program handles the start/ stop/ pause requests from the Service Control Manager To implement a service program we need to inherit from a class called the ServiceBase class
- 12. Service Control Program Creating a service control program is optional A Service Control Program facilitates easy access to control the service and also provides custom functionality The ServiceController class needs to be inherited to implement a service controller program
- 13. Service Configuration Program The configuration of a windows service either happens at the time of installation or later Configuration includes settings that will start the service automatically or manually To implement a configuration program, you need to inherit from classes – ServiceProcessInstaller, ServiceInstaller
- 14. Creating a Windows Service (1) Select Windows Service -
- 15. Example 1
- 16. Example 2
- 17. Example 3
- 18. Creating a Service Installer Adding an Installer -
- 19. Properties of the Service Installer Viewing the properties of the installer -
- 20. Installing a Windows Service The .exe file created has to be registered with the Windows Registry Syntax - OR
- 21. Running a Windows Service (1) Windows Services MMC -
- 22. Running a Windows Service (2) Windows Services started -
- 23. Uninstalling a Windows Service Syntax -
- 24. Example 4
- 25. Service Program Code (2) Consider the following example -
- 26. OnStart() Example 5 -
- 28. OnStop() Example 6 -