网络打印机C#Windows服务挑战

这个问题的解决方法是使用C＃开发一个Windows服务，该服务将监控打印机并将打印请求定向到网络打印机。具体步骤如下：

1.安装打印机驱动程序并安装网络打印机。 2.创建一个Windows服务项目。 3.在服务项目中添加一个打印机监视器，并建立一个打印机监听事件，以便在打印作业提交时接收通知。 4.使用Win32打印机API连接到本地打印机。 5.将打印作业转发到网络打印机。

以下是关键代码示例：

打印机监视器：

public partial class PrinterService : ServiceBase
{
    private LocalPrintServer _localPrintServer = new LocalPrintServer();
    private PrintQueue _printQueue;

    public PrinterService()
    {
        InitializeComponent();
    }

    protected override void OnStart(string[] args)
    {
        // Connect to the printer
        _printQueue = _localPrintServer.GetPrintQueue(args[0]);
        _printQueue.Refresh();

        // Set up a print job event handler
        _printQueue.JobSubmitted += PrintJobSubmitted;
    }

    protected override void OnStop()
    {
        // Remove the print job handler
        _printQueue.JobSubmitted -= PrintJobSubmitted;
    }

    private void PrintJobSubmitted(object sender, PrintJobEventArgs e)
    {
        // Forward the print job to the network printer
        var networkPrinter = new PrintQueue(new PrintServer(args[1]), args[2])
        {
            CurrentJobSettings = e.PrintJob.GetPrintTicket().GetXmlStream().ToString()
        };

        var networkJob = networkPrinter.AddJob(e.PrintJob.Name, e.PrintJob.JobIdentifier, e.PrintJob.JobStream, e.PrintJob.JobProperties, e.PrintJob.DocumentProperties);

        // Wait for the print job to complete on the network printer
        networkJob.Refresh();
        while (networkJob.IsPrinting)
        {
            Thread.Sleep(100);
            networkJob.Refresh();
        }
    }
}

安装Windows服务：

static class Program
{
    static void Main(string[] args)
    {
        if (!Environment.UserInteractive)
        {
            // Run as a service
            var servicesToRun = new ServiceBase[] { new PrinterService(args) };
            ServiceBase.Run(servicesToRun);
        }
        else if (args.Length == 3)
        {
            // Install or remove the service
            var serviceInstaller = new AssemblyInstaller(typeof(Program).Assembly, null)
            {
                UseNewContext = true
            };

            switch (args[0])
            {
                case "-install":
                    serviceInstaller.Install(new Hashtable());
                    serviceInstaller.Commit(new Hashtable());
                    break;

                case "-uninstall":
                    serviceInstaller.Uninstall(null);
                    break;
            }
        }
        else
        {
            Console.WriteLine("Invalid arguments.");
        }
    }
}

要安装服务，请在命令行中运行以下命令：

MyService.exe -install "Local Printer Name" "Network Printer IP" "Network Printer Name"

要卸载服务，请在命令行中运行以下命令：

MyService.exe -uninstall

使用此解决方案，Windows服务将定期检查打印机队列中的作业，并将其定向到网络打印机。如果有多个本地打印机，请为每个打