[英]C# Client/Server: using Streamreader/writer
I'm relatively new to C# but here goes:我对 C# 比较陌生,但这里有:
I am developing a remote file service client/server console application in C# which is supposed to exchange messages using synchronous sockets.我正在用 C# 开发一个远程文件服务客户端/服务器控制台应用程序,它应该使用同步套接字交换消息。
One of the main problems (even thought it might seem simple) is to return a string from the server, to the client using streamreader/streamwriter.主要问题之一(甚至认为它可能看起来很简单)是使用流读取器/流写入器将字符串从服务器返回到客户端。
The application user a command line interface with options (from a switch statement) to execute actions.应用程序用户使用带有选项(来自 switch 语句)的命令行界面来执行操作。 Ie typing 1 and enter would execute the code to send the string from the server to the client.
即输入 1 并回车将执行代码以将字符串从服务器发送到客户端。
Below is a sample code from the client:以下是来自客户端的示例代码:
try
{
using (TcpClient client = (TcpClient)clientObject)
using (NetworkStream stream = client.GetStream())
using (StreamReader rd = new StreamReader(stream))
using (StreamWriter wr = new StreamWriter(stream))
{
string menuOption = rd.ReadLine();
switch (menuOption)
{
case "1":
case "one":
string passToClient = "Test Message!";
wr.WriteLine(passToClient);
break;
}
while (menuOption != "4");
}
}
I understand the code I posted is just a snippet of the program, but it would take up a fair amount of space and was hoping you can gather what I mean from this, if not I will post more.我知道我发布的代码只是程序的一个片段,但它会占用相当多的空间,希望你能从中了解我的意思,如果不是,我会发布更多。
This is just to give a general idea of what I am going for,这只是为了大致了解我要做什么,
I appreciate any help / advice you can give.感谢您提供的任何帮助/建议。 Its not so much code examples I'm looking for (although a little would help) but more some explanation on streamreader/writer as I cant seem to understand much of what is online.
它不是我正在寻找的代码示例(尽管有一点会有所帮助),而是更多关于 streamreader/writer 的解释,因为我似乎无法理解在线内容。
Thanks.谢谢。
I think you're just missing a wr.flush();
我认为你只是缺少一个
wr.flush();
but this article should cover everything you need:但这篇文章应该涵盖你需要的一切:
http://thuruinhttp.wordpress.com/2012/01/07/simple-clientserver-in-c/ http://thuruinhttp.wordpress.com/2012/01/07/simple-clientserver-in-c/
Whenever you use StreamWriter
you need to Flush() the contents of the stream.每当您使用
StreamWriter
您都需要Flush()流的内容。 I'll quote MSDN as the reason becomes quite clear:我将引用 MSDN,因为原因变得很清楚:
Clears all buffers for the current writer and causes any buffered data to be written to the underlying stream.
清除当前写入器的所有缓冲区,并使所有缓冲数据写入底层流。
You can call it quite simply like:你可以很简单地称它为:
wr.flush();
解决方案可以更简单:
StreamWriter wr = new StreamWriter(stream) { AutoFlush = true }
I just ran a test using your code, and it works fine, I can step right into the "one" case statement.我刚刚使用您的代码运行了一个测试,它运行良好,我可以直接进入“one”case 语句。
I am guessing you are either not including the line-break in the string you are sending, or you just have the TcpClient or TcpListener configured wrong.我猜您要么没有在发送的字符串中包含换行符,要么只是将 TcpClient 或 TcpListener 配置错误。
Here is the Client-Side code for my test:这是我的测试的客户端代码:
TcpClient client = new TcpClient("127.0.0.1", 13579);
string message = "one" + Environment.NewLine;
Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);
NetworkStream stream = client.GetStream();
stream.Write(data, 0, data.Length);
Here is the Server-Side:这是服务器端:
IPAddress localAddr = IPAddress.Parse("127.0.0.1");
TcpListener server = new TcpListener(localAddr, 13579);
server.Start();
TcpClient client = server.AcceptTcpClient();
using (client)
using (NetworkStream stream = client.GetStream())
using (StreamReader rd = new StreamReader(stream))
using (StreamWriter wr = new StreamWriter(stream))
{
string menuOption = rd.ReadLine();
switch (menuOption)
{
case "1":
case "one":
string passToClient = "Test Message!";
wr.WriteLine(passToClient);
break;
}
while (menuOption != "4") ;
}
Just run the server-side code first, which will block while waiting for connection and then while waiting for data.只需先运行服务器端代码,它会在等待连接时阻塞,然后在等待数据时阻塞。 Then run the client-side code.
然后运行客户端代码。 You should be able to catch a breakpoint on the switch().
您应该能够在 switch() 上捕获断点。
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