Passing and Receiving Arguments in Visual Studio .NET

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Passing and Receiving Arguments
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A great feature of Windows services is their ability to receive arguments. You specify one or more arguments for your service in the General tab of the Properties dialog box in the Services MMC snap-in. For example, the final version of the Encryptor service provided in the companion code receives the name of the directory in which files are automatically encrypted in this way. (See Figure 20-3.) The arguments that you specify are converted to a String array and passed as an argu ment to the OnStart method. So you need only one statement to implement this feature in the Encryptor service. (Added lines are in boldface.)
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20:
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Protected Overrides Sub OnStart(ByVal args() As String) If an argument has been specified, use it as the path of the directory being watched. If args.Length > 0 Then Path = args(0) End Sub
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Windows Services
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Debugging a Windows Service
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The easiest way to debug a Windows service is to attach the Visual Studio debugger to it. To use this technique, compile the service project in Debug mode, start the process as usual, and switch back to Visual Studio. Next, run the Processes command from the Debug menu, select the Show system processes option, and double-click on the Encryp torService element in the list of running processes. This action brings up the Attach To Process dialog box, which lets you confirm that you want to debug the service applica tion (at this point, the screen looks like Figure 20-4). Click OK to close this dialog box.
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Figure 20-4
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Attaching the Visual Studio debugger to a running Windows service application
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In the Processes dialog box, you can decide what happens when the debugging is stopped. You can choose the Detach From This Process option (in which case, the ser vice will continue to run when the debugger stops) and the Terminate This Process option (in which case, the service will terminate). Finally, click Close to start debugging the service application. You can now set one or more breakpoints, as you would in a regular application. For example, you might set a breakpoint at the beginning of the FileSystemWatcher1_Created procedure to trace code in the service application and see what happens when a new file is created in the directory being monitored.
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Part IV
Win32 Applications
When debugging a service in this fashion, you should keep one limitation in mind: you can attach a debugger only to a service that s already running. For this reason, you can t debug the code in the Main or OnStart procedure. In theory, you might add a pause in the OnStart method to give you the time necessary to set up the debugger immediately after the service is started however, Windows imposes a 30-second timeout on all attempts to start a service. If your debugging chores take longer than that, the system assumes that the service can t run. One way to debug the code in the OnStart method is to add another dummy service to your service project. You can therefore start the dummy process so that its process appears in the list of processes that can be debugged in Visual Studio. At this point, you can attach the debugger to that process and trace through all its initialization code. Even in this case, however, you re subject to the 30-second timeout mentioned in the preceding paragraph.
The ServiceController Component
The System.ServiceProcess.ServiceController component lets you programmatically control any service on a local or remote machine. You can list all the existing services as well as start, stop, pause, and resume them (provided you have sufficient adminis trative permissions on the system). You can create an instance of the ServiceController class in three distinct ways: by dragging an element from the Server Explorer window to the form s component tray area, by dropping an item from the Component tab of the Toolbox, or simply by means of code. The three techniques are equivalent, but I ll focus on the last one because it also can be used from inside classes and modules.
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