我创建了一个 Windows 服务,允许通过命名管道进行通信。
当我编写一些单元测试来启动管道并测试通信时,此代码运行良好,但现在我在 Windows 服务中安装了相同的代码,但出现以下错误:
Exception Info: System.IO.IOException
Stack:
at System.IO.__Error.WinIOError(Int32, System.String)
at System.IO.Pipes.NamedPipeServerStream.Create(System.String, System.IO.Pipes.PipeDirection, Int32, System.IO.Pipes.PipeTransmissionMode, System.IO.Pipes.PipeOptions, Int32, Int32, System.IO.Pipes.PipeAccessRights, SECURITY_ATTRIBUTES)
at System.IO.Pipes.NamedPipeServerStream..ctor(System.String, System.IO.Pipes.PipeDirection, Int32, System.IO.Pipes.PipeTransmissionMode, System.IO.Pipes.PipeOptions, Int32, Int32, System.IO.Pipes.PipeSecurity, System.IO.HandleInheritability, System.IO.Pipes.PipeAccessRights)
at System.IO.Pipes.NamedPipeServerStream..ctor(System.String, System.IO.Pipes.PipeDirection, Int32, System.IO.Pipes.PipeTransmissionMode,
System.IO.Pipes.PipeOptions, Int32, Int32, System.IO.Pipes.PipeSecurity)
at System.Threading.ThreadHelper.ThreadStart_Context(System.Object)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Threading.ThreadHelper.ThreadStart(System.Object)
现在我做了一些谷歌搜索,并在 stackoverflow 中找到了这篇文章> POST但我实现了这个(除了 ps.AddAccessRule(pa); 因为它没有提到 was pa was) 我得到了同样的错误。
这是我的线程代码:
var pipeSecurity = new PipeSecurity();
pipeSecurity.AddAccessRule(new PipeAccessRule("Users", PipeAccessRights.ReadWrite | PipeAccessRights.CreateNewInstance, AccessControlType.Allow));
pipeSecurity.AddAccessRule(new PipeAccessRule("CREATOR OWNER", PipeAccessRights.FullControl, AccessControlType.Allow));
pipeSecurity.AddAccessRule(new PipeAccessRule("SYSTEM", PipeAccessRights.FullControl, AccessControlType.Allow));
var pipeServer = new NamedPipeServerStream(pipeName, PipeDirection.InOut, numThreads, PipeTransmissionMode.Message, PipeOptions.Asynchronous, 1024, 1024, pipeSecurity);
pipeServer.WaitForConnection();
任何帮助都会很棒。
好的,这是运行监听器的代码:
Windows 服务:
public static System.Timers.Timer Timer = new System.Timers.Timer();
public void Start()
{
Timer.Elapsed += (HeartBeat);
//Timer.Interval = 100; //Live
Timer.Interval = 2000; //Debug
Timer.Start();
}
public void Stop()
{
Timer.Stop();
}
private static void HeartBeat(object sender, ElapsedEventArgs e)
{
//listen for a message
ListenForMessage();
}
监听器代码:
private const String pipeName = "StackOVerFlowPipeCode";
private const int numThreads = 10;
public static void ListenForMessage()
{
int i;
var servers = new Thread[numThreads];
for (i = 0; i < numThreads; i++)
{
servers[i] = new Thread(ServerThread);
servers[i].Start();
}
Thread.Sleep(250);
while (i > 0)
{
for (var j = 0; j < numThreads; j++)
{
if (servers[j] == null) continue;
if (!servers[j].Join(250)) continue;
servers[j] = null;
i--; // decrement the thread watch count
}
}
}
private static void ServerThread(object data)
{
try
{
var pipeServer = new NamedPipeServerStream(pipeName, PipeDirection.InOut, numThreads);
pipeServer.WaitForConnection();
var ss = new StreamString(pipeServer);
ss.WriteString(pipeName);
var message = ss.ReadString();
//DO STUFF HERE WITH MESSAGE
pipeServer.Close();
}
catch (Exception ex)
{
//CRY LIKE A BABY WHO LOST HIS TEDDY
throw ex;
}
}
发现异常消息:所有管道实例都忙。
最佳答案
事实证明我的整个实现是有缺陷的,我删除了很多代码并重写了它并且它起作用了。我删除了 ListenForMessage() 中的代码,并将其替换为 ServerThread() 中的代码,然后还更改了服务调用此方法的方式,将其更改为计时器中的线程。它起作用了。
好吧,收到消息后的代码(如上面的//Do Stuff 所示)确实可以工作,但至少这个任务已经完成了。
注意:永远不要只是复制和过去代码并认为这是理所当然的,始终阅读并理解它。
关于c# - NamedPipes 在 Windows 服务中抛出异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4051048/