我还在努力提高我之前写的一点点。 现在我遇到了接收数据的问题。我有一个程序,我用它来发送字符串使用tcpClient到一个程序,我在其中侦听指定的端口。它工作正常,所以我决定再向前发送数据
public static void receiveThread()
{
while (true)
{
TcpListener tcpListener = new TcpListener(IPAddress.Any, port);
tcpListener.Start();
Console.WriteLine("Waiting for connection...");
TcpClient tcpClient = tcpListener.AcceptTcpClient();
Console.WriteLine("Connected with {0}", tcpClient.Client.RemoteEndPoint);
while (!(tcpClient.Client.Poll(20, SelectMode.SelectRead)))
{
NetworkStream networkStream = tcpClient.GetStream();
StreamReader streamReader = new StreamReader(networkStream);
data = streamReader.ReadLine();
if (data != null)
{
Console.WriteLine("Received data: {0}", data);
send(data); // Here Im using send Method
}
}
Console.WriteLine("Dissconnected...\n");
tcpListener.Stop();
}
}
/// <summary>
/// Sending data
/// </summary>
/// <param name="data">Data to send</param>
public static void send(string data)
{
TcpClient tcpClient = new TcpClient();
try
{
tcpClient.Connect(ipAddress, sendPort);
Console.WriteLine("Connected with {0}", tcpClient.Client.RemoteEndPoint);
}
catch (Exception e)
{
Console.WriteLine(e);
}
if (tcpClient.Connected)
{
NetworkStream networkStream = tcpClient.GetStream();
StreamWriter streamWriter = new StreamWriter(networkStream);
Console.WriteLine("Messege {0} to {1}", data, tcpClient.Client.RemoteEndPoint);
streamWriter.WriteLine(data);
streamWriter.Flush();
tcpClient.Close();
}
}
有时它工作正常,但更常见的是,我们称之为接收器,无法得到我想发送的内容。我真的不知道它有什么问题。看起来send方法可能有问题。以下是接收器输出的示例
Waiting for connection...
Connected with 127.0.0.1:52449
Dissconnected...
Waiting for connection...
Connected with 127.0.0.1:52450
Received data: qweqwe
Dissconnected...
Waiting for connection...
Connected with 127.0.0.1:52451
Dissconnected...
Waiting for connection...
Connected with 127.0.0.1:52452
Dissconnected...
Waiting for connection...
Connected with 127.0.0.1:52453
Received data: zxczx
Dissconnected...
Waiting for connection...
Connected with 127.0.0.1:52454
Dissconnected...
Waiting for connection...
Connected with 127.0.0.1:52455
Received data: aasd
Dissconnected...
Waiting for connection...
Connected with 127.0.0.1:52457
Received data: www
Dissconnected...
答案 0 :(得分:6)
这里有几个问题:
StreamReader
有一个4kB缓冲区,并会在第一次调用ReadLine()
时尝试尽可能多地读取。结果是你可能在StreamReader中有数据并且当没有更多可用数据时进入Poll(),因为它已被读取。Poll()
需要几微秒。对于传入数据,等待 0.02ms 可能会返回false,除非您在调用Poll()
之前存在数据。如果您只是想读取行并想要超时和StreamReader
,我会做类似的事情:
delegate string ReadLineDelegate ();
...
using (NetworkStream networkStream = tcpClient.GetStream()) {
StreamReader reader = new StreamReader(networkStream);
ReadLineDelegate rl = new ReadLineDelegate (reader.ReadLine);
while (true) {
IAsyncResult ares = rl.BeginInvoke (null, null);
if (ares.AsyncWaitHandle.WaitOne (100) == false)
break; // stop after waiting 100ms
string str = rl.EndInvoke (ares);
if (str != null) {
Console.WriteLine ("Received: {0}", str);
send (str);
}
}
}
答案 1 :(得分:1)
在追逐鬼魂之前,确保数据实际存在于流上。如果有ALWAYS数据我们可以解决问题,但是从逻辑上看它看起来好像流被淘汰或者没有数据就可以了。