At the start of our method, we should load our WinML model, pretty much the same way we were doing before:. This creates a FileSystemWatcher instance that will hook up to some Windows events for us, and automatically raise the Created event whenever there is a new file created on the folder we are watching. Notice that we are adding Filters to it, which are mapping to the extension filters coming from our new command line argument. We are waiting milliseconds 1 second , before we process the file.
The FileSystemWatcher is attached to the Windows events, and is so fast that it will raise the Created event even before the file is closed by whichever process is still creating it. We could have created a retry logic if we caught this specific exception but, again, this solution is a simplification, and will keep our code simple for this sample. The ProcessFileAsync method expects a full path to an image file and a confidence float, just like we had before.
Notice that the folderName argument passed in our MoveFileToFolder method is the label with highest confidence, returned by our WinML classification model for that one specific image. Therefore, we are moving that file inside a folder with its category name.
The whole process is so fast that if you copy and paste an image file into the folder we are watching, it barely stays inside the folder, almost instantaneously being moved to a newly or existing folder. The next step is to 1 deploy this somewhere, 2 register our Windows Service, and 3 start it! The deployment step is very straight forward.
This will let you select where you want to publish it, and since this is a simple. NET5 console application, we can choose between a variety of places. Lets select a simple Folder. On the next step, just select Folder again and click Next. On the last step, we need to select a path. Click on Finish to create the publish profile, and then on Publish to build our code and deploy it! You will see that all the files that we need are properly deployed in that folder, so we can now configure our service!
Another way to publish your project is using the dotnet publish command. Windows Services are managed through a tool called Service Controller , a. Remember that you need admin privileges to create a service on Windows, so run an elevated command line to run these commands. Notice that we are passing the binPath argument in quotes. We are passing our arguments to the executable right after the path, still inside the quotes, which will be handled by our implementation of the CommandLineParser.
This means our service is created, but not yet running. To run it, lets call the SC command again, but now with different parameters:. If you never noticed, there is a Services tab:. Here is the folder before I do anything:. The instant I copy these files over to the Images folder, there will be an intentional one second delay, followed by a refresh of explorer showing all the images already classified:. But how do we know how these files were classified?
The answer is the Windows Events. When you open the Event Viewer you will see a tree view on the left side, that categorizes the events. Remember when we configured our LogName , during our process initialization? This is where the log will be, inside the Applications and Services Logs :.
You can quickly see that the Cat2. NET Core. Windows Services. NET Core base, but can be added via a single handy dandy package. What we are most interested in from the above Nuget is the ServiceBase class. Start, Stop, Pause etc.
We are going to create a class in our code that does a simple logging job to a temp file, just so we can see how it works. Our code looks like :. Heavy lifting should not be happening inside the OnStart event at all!
To do that, we can run the following from a command prompt in the root of our project. Notice that we pass in the -r flag to tell it which platform to build for. For this next part, you will need to open a command prompt as an administrator. Then use the following command :. The SC command is a bog standard windows command Has nothing to do with. NET Core , that installs a windows service. Importantly, we pass in the full path to our windows service exe. Here is where I really think doing things the Microsoft way falls down.
Debugging our service becomes a real chore. For starters our overridden methods from the ServiceBase are set to be protected. The best way I found was to have a public method for each event that the protected method also calls. Bit confusing, but works like this :. Your other option is to do a release in debug mode, actually install the service, and then attach the debugger.
Like creating an install. Luckily there is a helpful library called Topshelf that takes a tonne of the pain away, and in the next part of this series we will be looking at how we can get going with that. NET Core 3. Elapsed event:. In the MyNewService class, add a member variable. It contains the identifier of the next event to write into the event log:.
Instead of running all your work on the main thread, you can run tasks by using background worker threads. For more information, see System. Insert a line of code in 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. Services report their status to the Service Control Manager so that a user can tell whether a service is functioning correctly.
InteropServices namespace:. Add the following code to MyNewService. Before you run a Windows service, you need to install it, which registers it with the Service Control Manager. Add installers to your project to handle the registration details. In the Design view, select the background area, then choose Add Installer from the shortcut menu. By default, Visual Studio adds a component class named ProjectInstaller , which contains two installers, to your project.
These installers are for your service and for the service's associated process. Add text to the Description property, such as A sample service. This text appears in the Description column of the Services window and describes the service to the user.
Add text to the DisplayName property. This text appears in the Display Name column of the Services window. This name can be different from the ServiceName property, which is the name the system uses for example, the name you use for the net start command to start your service.
Set the StartType property to Automatic from the drop-down list. When you're finished, the Properties windows should look like the following figure:. Set the Account property to LocalSystem from the drop-down list.
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.
Before you decide to add startup parameters, consider whether it's the best way to pass information to your service. Although they're easy to use and parse, and a user can easily override them, they might be harder for a user to discover and use without documentation. Generally, if your service requires more than just a few startup parameters, you should use the registry or a configuration file instead. A Windows service can accept command-line arguments, or startup parameters.
When you add code to process startup parameters, a user can start your service with their own custom startup parameters in the service properties window. However, these startup parameters aren't persisted the next time the service starts. To set startup parameters permanently, set them in the registry. Under each service's subkey, 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 sample code, see ConfigurationManager. Select Program. In the Main method, change the code to add an input parameter and pass it to the service constructor:.
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