From the Components section of the Toolbox , drag an EventLog component to the designer. In the code editor, locate the OnStart method that was automatically overridden when you created the project. Add a line of code that writes an entry to the event log when the service starts:. A service application is designed to be long-running, so it usually polls or monitors something in the system. The monitoring is set up in the OnStart method. The OnStart method must return to the operating system after the service's operation has begun.
It must not loop forever or block. To set up a simple polling mechanism, you can use the System. Timer component as follows: In the OnStart method, set parameters on the component, and then set the Enabled property to true. The timer raises events in your code periodically, at which time your service could do its monitoring. You can use the following code to do this:.
Add a member variable to the class. It contains the identifier of the next event to write into the event log. You might want to perform tasks by using background worker threads instead of running all your work on the main thread. For more information, see System. Add a line of code to the OnStop method that adds an entry to the event log when the service is stopped:. You can override the OnPause , OnContinue , and OnShutdown methods to define additional processing for your component.
The following code shows how you can override the OnContinue method:. Some custom actions have to occur when a Windows service is installed by the Installer class. Visual Studio can create these installers specifically for a Windows service and add them to your project.
Services report their status to the Service Control Manager, so that users can tell whether a service is functioning correctly. By default, services that inherit from ServiceBase report a limited set of status settings, including Stopped, Paused, and Running.
If a service takes a little while to start up, it might be helpful to report a Start Pending status. Add a using statement or Imports declaration for the System. InteropServices namespace in the MyNewService.
Add the following code to MyNewService. To implement the Start Pending status, add the following code to the beginning of the OnStart method:. Add code to set the status to Running at the end of the OnStart method. Optional Repeat this procedure for the OnStop method. Before you can run a Windows service, you need to install it, which registers it with the Service Control Manager. You can add installers to your project that handle the registration details. Click the background of the designer to select the service itself, instead of any of its contents.
By default, a component class that contains two installers is added to your project. The component is named ProjectInstaller , and the installers it contains are the installer for your service and the installer for the service's associated process.
Set the Description property to some text, such as "A sample service". Set the DisplayName property to the text that you want to appear in the Services window in the Name column. This name can be different from the ServiceName property, which is the name used by the system for example, when you use the net start command to start your service. Set the StartType property to Automatic. Set the Account property to LocalSystem. This causes the service to be installed and to run using the local system account.
The LocalSystem account has broad permissions, including the ability to write to the event log. Use this account with caution, because it might increase your risk of attacks from malicious software. For other tasks, consider using the LocalService account, which acts as a non-privileged user on the local computer and presents anonymous credentials to any remote server. This example fails if you try to use the LocalService account, because it needs permission to write to the event log.
For more information about installers, see How to: Add Installers to Your service Application. A Windows service, like any other executable, can accept command-line arguments, or startup parameters. When you add code to process startup parameters, users can start your service with their own custom startup parameters by using the Services window in the Windows Control Panel. However, these startup parameters are not persisted the next time the service starts. To set startup parameters permanently, you can set them in the registry, as shown in this procedure.
Before you decide to add startup parameters, consider whether that is the best way to pass information to your service. Although startup parameters are easy to use and to parse, and users can easily override them, they might be harder for users to discover and use without documentation. Generally, if your service requires more than just a few startup parameters, you should consider using the registry or a configuration file instead.
Under the service's key, you can use the Parameters subkey to store information that your service can access. You can use application configuration files for a Windows service the same way you do for other types of programs. For example code, see AppSettings. Create an empty project and create a reference to the necessary namespaces by following these steps:. NET Framework tab, scroll to System. Add a class and configure it to inherit from ServiceBase:. Create a Main method for your class, and use it to define the service your class will contain; userService1 is the name of the class:.
Override the OnStart method, and define any processing you want to occur when your service is started. Override any other methods you want to define custom processing for, and write code to determine the actions the service should take in each case. Add the necessary installers for your service application. For more information, see How to: Add Installers to Your Service Application. Build your project by selecting Build Solution from the Build menu.
Create a setup project and the custom actions to install your service. For an example, see Walkthrough: Install and Uninstall Services. Introduction to Windows Service Applications How to: Create Windows Services How to: Log Information About Services Walkthrough:
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Mar 02, · A basic Windows service in C++ (CppWindowsServ ice) This code sample demonstrates creating a basic Windows Service application in VC++. An article that shows how to create a simple Windows service in C++. Download sample - KB; Introduction. why not writing a simple desktop application/process? i mean which parts of jobs are getting easier to do if we use services or why should we use them? tnx: Re: purpose of service.
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