的StreamWriter将不刷新到的NetworkStream [英] StreamWriter won't flush to NetworkStream

问题描述

使用的StreamWriter 来写入的NetworkStream 和的StreamReader 来读取响应。这款应用程序发送命令和读取响应新闻服务器。

Using a StreamWriter to write to a NetworkStream, and a StreamReader to read the response. The app is sending commands and reading responses to a news server.

简体code（没有错误处理，等等。）：

Simplified code (sans error handling, etc.):

tcpClient = new TcpClient();
tcpClient.Connect(Name, Port);

networkStream = tcpClient.GetStream();
serverReader = new StreamReader(networkStream, Encoding.Default);
serverWriter = new StreamWriter(networkStream, Encoding.ASCII) {
                     AutoFlush = true
                   };

// reads the server's response to the connect:  "200 news.newsserver.com"
// commenting out these lines doesn't solve the problem
while (serverReader.Peek() > -1) {
    serverReader.ReadLine();
}

serverWriter.WriteLine("authinfo user username");

// expect response "381 more authentication required", but code just blocks
string response = serverReader.ReadLine();

在最后一行的code块，presumably等待网络数据流发送响应。

The code blocks at that last line, presumably waiting for the network stream to send a response.

我能避免通过设置超时环挂的程序 serverReader.Peek（），但我会永远超时;我从来没有得到回应。

I can avoid hanging the app by setting a timeout loop using serverReader.Peek(), but I will always timeout; I never get a response.

如果我远程连接到服务器和端口直接输入命令，立刻得到回应。

If I telnet to the server and port directly and enter the commands, I get an immediate response.

如果我称之为 serverWriter.Flush（）明确，而不是使用自动刷新属性，我仍然阻塞，从来没有得到回应。

If I call serverWriter.Flush() explicitly, instead of using the AutoFlush property, I still block and never get a response.

任何想法，为什么我没有收到使用此方法服务器的响应？

Any ideas why I'm not getting a response to the server using this approach?

谢谢！

以上code的确实的工作对我来说，让我回去，并在那code到code这是行不通的建造。

The above code does work for me, so I went back and built upon that code to the code that wouldn't work.

在code，挂，我还是用的超时环路serverReader.Peek（）。皮克（）总是返回-1，即使有缓冲区中的数据读取！与阻塞调用的ReadLine（）更换皮克（）循环解决了我的问题。

In the code that hangs, I was still using the timeout loop with serverReader.Peek(). Peek() always returns -1, even though there is data in the buffer to read!! Replacing the Peek() loop with a blocking call to ReadLine() solves my problem.

我把原来因为应用程序是多线程超时循环，我不想阻止。我将不得不重新审视这个问题，看我怎么能解决这个线程时间没有使用皮克（）。

I put the timeout loop in originally because the app is multi-threaded, and I didn't want to block. I will have to revisit this issue and see how I can resolve the thread timing without using Peek().

感谢所有，很好的答案！

Thanks all, good answers!

推荐答案

以上code的确实的工作对我来说，让我回去，并在那code内置到code表示是行不通的。

The above code does work for me, so I went back and built upon that code to the code that wouldn't work.

在code，挂，我还是用的超时环路serverReader.Peek（）。皮克（）总是返回-1，即使有缓冲区中的数据读取！与阻塞调用的ReadLine（）更换皮克（）循环解决了我的问题。

In the code that hangs, I was still using the timeout loop with serverReader.Peek(). Peek() always returns -1, even though there is data in the buffer to read!! Replacing the Peek() loop with a blocking call to ReadLine() solves my problem.

我把原来因为应用程序是多线程超时循环，我不想阻止。我将不得不重新审视这个问题，看我怎么能解决这个线程时间没有使用皮克（）。

I put the timeout loop in originally because the app is multi-threaded, and I didn't want to block. I will have to revisit this issue and see how I can resolve the thread timing without using Peek().

感谢所有，很好的答案！

Thanks all, good answers!

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