使用Windows服务轮询

Question

通过一些示例，我参考了我的轮询Polling Service - C#。

这是我的代码。

public partial class Service1 : ServiceBase 
{ 
    private readonly PollingService _pollingService = new PollingService(); 

    public Service1() 
    { 
     InitializeComponent(); 
    } 

    protected override void OnStart(string[] args) 
    { 
     _pollingService.StartPolling(); 
    } 

    protected override void OnStop() 
    { 
     _pollingService.StopPolling(); 
    } 
} 

public class PollingService 
{ 
    private Thread _workerThread; 
    private AutoResetEvent _finished; 
    private const int _timeout = 60 * 1000; 
    string command = "5120000000000000000000000000000"; 


    public void StartPolling() 
    { 
     _workerThread = new Thread(Poll); 
     _finished = new AutoResetEvent(false); 
     _workerThread.Start(); 
    } 

    private void Poll() 
    { 
     while (!_finished.WaitOne(_timeout)) 
     { 
      //do the task 
      using (TcpClient newclient = new TcpClient()) 
      { 
       IAsyncResult ar = newclient.BeginConnect("192.168.0.151", 4000, null, null); 
       if (!ar.AsyncWaitHandle.WaitOne(TimeSpan.FromSeconds(2), false)) 
       { 
        return; 
       } 

       NetworkStream ns = newclient.GetStream(); 
       byte[] outbytes = HexStringToByteArray(command); 
       ns.Write(outbytes, 0, outbytes.Length); 
      } 
     } 
    } 

    public void StopPolling() 
    { 
     _finished.Set(); 
     _workerThread.Join(); 
    } 

    public static byte[] HexStringToByteArray(string hexString) 
    { 
     if (hexString.Length % 2 > 0) 
     { 
      throw new Exception("Invalid command."); 
     } 
     byte[] result = new byte[hexString.Length/2]; 
     try 
     { 
      for (int i = 0; i < result.Length; i++) 
      { 
       result[i] = Convert.ToByte(hexString.Substring(2 * i, 2), 16); 
      } 
     } 
     catch (Exception) 
     { 
      throw; 
     } 
     return result; 
    } 
} 

我设法安装。但是，当我尝试启动服务时，我得到Windows could not start the service on Local Computer. Error 5: Access is denied。我试过使用这里给出的解决方案，Error 5 : Access Denied when starting windows service，但是，它不工作。

Answer 1

我找到了解决方案，将服务属性从This Account更改为Local System Account并附带一些更新的代码。

using (TcpClient newclient = new TcpClient("192.168.0.151", 4000)) 
{ 
    NetworkStream ns = newclient.GetStream(); 
    byte[] outbytes = Encoding.ASCII.GetBytes(command); 
    ns.Write(outbytes, 0, outbytes.Length); 
    ns.Close(); 
    newclient.Close(); 
}