[英]TCP C# Server Python Client cannot communicate
我正在寫一些套接字服務器,客戶端應用程序,我有一個主要問題。 我的目標是在C#中創建一個異步服務器應用程序,在python中創建一個基本客戶端APP。 當我按照簡單的例子進行程序工作時。 但是當我編寫一個異步服務器,其中read
和write
處理程序消息是從客戶端APP發送的時,它不起作用。
這是我正在使用的示例服務器代碼。
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
// State object for reading client data asynchronously
public class StateObject
{
// Client socket.
public Socket workSocket = null;
// Size of receive buffer.
public const int BufferSize = 1024;
// Receive buffer.
public byte[] buffer = new byte[BufferSize];
// Received data string.
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousSocketListener
{
// Thread signal.
public static ManualResetEvent allDone = new ManualResetEvent(false);
public AsynchronousSocketListener()
{
}
public static void StartListening()
{
// Data buffer for incoming data.
byte[] bytes = new Byte[1024];
// Establish the local endpoint for the socket.
// The DNS name of the computer
// running the listener is "host.contoso.com".
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 3333);
IPEndPoint ipLocal = new IPEndPoint(IPAddress.Any, 3333);
// Create a TCP/IP socket.
Socket listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// Bind the socket to the local endpoint and listen for incoming connections.
try
{
listener.Bind(ipLocal);
listener.Listen(100);
while (true)
{
// Set the event to nonsignaled state.
allDone.Reset();
// Start an asynchronous socket to listen for connections.
Console.WriteLine("Waiting for a connection...");
listener.BeginAccept(
new AsyncCallback(AcceptCallback),
listener);
// Wait until a connection is made before continuing.
allDone.WaitOne();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
Console.WriteLine("\nPress ENTER to continue...");
Console.Read();
}
public static void AcceptCallback(IAsyncResult ar)
{
// Signal the main thread to continue.
allDone.Set();
// Get the socket that handles the client request.
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
// Create the state object.
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
}
public static void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
// Retrieve the state object and the handler socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
// Read data from the client socket.
int bytesRead = handler.EndReceive(ar);
Console.WriteLine("\n Enters(0)");
if (bytesRead > 0)
{
Console.WriteLine("\n Enters(1)");
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(
state.buffer, 0, bytesRead));
// Check for end-of-file tag. If it is not there, read
// more data.
content = state.sb.ToString();
if (content.IndexOf("<EOF>") > -1)
{
// All the data has been read from the
// client. Display it on the console.
Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",
content.Length, content);
// Echo the data back to the client.
Send(handler, content);
}
else
{
Console.WriteLine("\n Detect");
// Not all data received. Get more.
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
}
Console.WriteLine("\n Enters(1)");
}
private static void Send(Socket handler, String data)
{
// Convert the string data to byte data using ASCII encoding.
byte[] byteData = Encoding.ASCII.GetBytes(data);
// Begin sending the data to the remote device.
handler.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), handler);
}
private static void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket handler = (Socket)ar.AsyncState;
// Complete sending the data to the remote device.
int bytesSent = handler.EndSend(ar);
Console.WriteLine("Sent {0} bytes to client.", bytesSent);
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args)
{
StartListening();
return 0;
}
}
這是一個簡單的測試客戶端的python代碼
import socket
HOST, PORT = "127.0.0.1", 3333
data = "data"
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect((HOST, PORT))
sock.sendall(data)
print data
finally:
sock.close()
由於我在Server的ReadCallback
上插入了一些調試代碼,我看到該例程被調用,但它不會將接收的數據作為消息處理。 它似乎沒有端點。
任何想法或解決方案將不勝感激。
當bytesRead == 0
, ReadCallback
忽略了這種情況,這意味着客戶端停止發送數據。 如果您的Python代碼實際上是在沒有"<EOF>"
"data"
情況下發送"data"
,那么C#服務器就會忘記您的連接。
關於您的C#代碼,您可以改進一些事項:
使用ManualResetEventSlim
,它更快,它不使用操作系統句柄(除非你實際使用WaitHandle
屬性)
你應該處理來自例外EndAccept
在AcceptCallback
和EndReceive
在ReadCallback
,並可能提高例外處理SendCallback
你每次都在ReadCallback
從StringBuilder
創建一個字符串,這完全違背了使用StringBuilder
的目的; 你應該解析從Encoding.ASCII.GetString
獲得的每個字符串,以連續搜索每個字符<
, E
, O
, F
和>
// Add to StateObject
public const string EOF = "<EOF>";
public int eofOffset = -1;
public int searchOffset = 0;
// In ReadCallback
string data = Encoding.ASCII.GetString(state.buffer, 0, bytesRead);
state.sb.Append(data);
int o = state.searchOffset + state.eofOffset + 1;
while (o < state.sb.Length)
{
if (state.sb[o] != StateObject.EOF[state.eofOffset + 1])
{
state.eofOffset = -1;
state.searchOffset++;
o = state.searchOffset;
}
else
{
state.eofOffset++;
if (state.eofOffset == StateObject.EOF.Length)
{
break;
}
o++;
}
}
// Replace this:
//content = state.sb.ToString();
//if (content.IndexOf("<EOF>") > -1)
// with this:
if (state.eofOffset == StateObject.EOF.Length)
{
// Here is a good place to turn the StringBuilder into a string
// Perhaps truncate data to send back up to state.searchOffset
// ...
}
不是C#
的專家,但我認為你的Python
程序有問題。
try:
sock.connect((HOST, PORT))
sock.sendall("data")
print data
finally:
sock.close()
你想打印data
,這是沒有定義的。 因此, except
部分將被執行(如果它存在)。 然后,程序完成套接字關閉。
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