服务器端未正确读取消息 [英] Server side not reading message correctly
问题描述
我正在开发一个客户端-服务器应用程序,其中客户端在Android中,服务器在C#中.在将C#用于服务器之前,我使用了autoIT,除了我必须发送9个字符的消息,否则它将获得奇怪的符号这一事实,它可以很好地工作.
I'm developing a client-server application, where the client is in Android and the server in C#. Before using C# for the server I used autoIT and it worked fine aside from the fact that I had to send messages of 9 characters or else it would get weird symbols.
现在在C#中,我遇到了同样的问题.我尝试删除所有空白,但始终在邮件开头留下一些内容.
Now in C# I'm having the same problem. I tried removing all white space but it always leaves something at the start of the message.
单字消息,例如:
"SendClose"
服务器读取为
" SendClose" or " SendClose" if i remove the white spaces
请注意前导空白.有趣的是,当我检查字符串长度时,它说只有11个字符,所以我不知道发生了什么.也许有2个标签?
Note the leading white space. It's interesting because when I check the string length it says it is only 11 characters so I don't know what is going on; maybe 2 tabs?
这是我的C#代码:
using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
public class TcpListenerSample {
static void Main(string[] args) {
try {
// set the TcpListener on port 13000
int port = 80;
IPAddress localAddr = IPAddress.Parse("192.168.1.68");
TcpListener server = new TcpListener(localAddr, port);
// Start listening for client requests
server.Start();
// Buffer for reading data
byte[] bytes = new byte[1024];
string data;
//Enter the listening loop
while (true) {
Console.Write("Waiting for a connection... ");
// Perform a blocking call to accept requests.
// You could also user server.AcceptSocket() here.
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Connected!");
// Get a stream object for reading and writing
NetworkStream stream = client.GetStream();
int i;
// Loop to receive all the data sent by the client.
i = stream.Read(bytes, 0, bytes.Length);
while (i != 0) {
// Translate data bytes to a ASCII string.
data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
Console.WriteLine(String.Format("Received: {0}", data));
// Process the data sent by the client.
data = data.ToUpper();
byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);
// Send back a response.
stream.Write(msg, 0, msg.Length);
Console.WriteLine(String.Format("Sent: {0}", data));
i = stream.Read(bytes, 0, bytes.Length);
}
// Shutdown and end connection
client.Close();
}
}
catch (SocketException e) {
Console.WriteLine("SocketException: {0}", e);
}
Console.WriteLine("Hit enter to continue...");
Console.Read();
}
}
推荐答案
data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
Console.WriteLine(StripExtended(data));
static string StripExtended(string arg)
{
StringBuilder buffer = new StringBuilder(arg.Length); //Max length
foreach(char ch in arg)
{
UInt16 num = Convert.ToUInt16(ch);//In .NET, chars are UTF-16
//The basic characters have the same code points as ASCII, and the extended characters are bigger
if((num >= 32u) && (num <= 126u)) buffer.Append(ch);
}
return buffer.ToString();
}
}
}
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