使用msdn上的异步接收数据的例子，发现漏接数据
使用TCP &UDP测试工具，创建一个服务器
每100ms发送一次1234567890
使用msdn上的异步接收数据的例子，作为客户端来接收数据
通过输出日志发现，并不是每一秒都能接收到10次数据
以下为代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;
namespace AsynSocket
{
// State object for receiving data from remote device.
public class StateObject
{
// Client socket.
public Socket workSocket = null;
// Size of receive buffer.
public const int BufferSize = 256;
// Receive buffer.
public byte[] buffer = new byte[BufferSize];
// Received data string.
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousClient
{
// The port number for the remote device.
private const int port = 6000;
// ManualResetEvent instances signal completion.
private static ManualResetEvent connectDone =
new ManualResetEvent(false);
private static ManualResetEvent sendDone =
new ManualResetEvent(false);
private static ManualResetEvent receiveDone =
new ManualResetEvent(false);
// The response from the remote device.
private static String response = String.Empty;
private static void StartClient()
{
// Connect to a remote device.
try
{
// Establish the remote endpoint for the socket.
// The name of the
// remote device is "host.contoso.com".
IPHostEntry ipHostInfo = Dns.Resolve("127.0.0.1");
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);
// Create a TCP/IP socket.
Socket client = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// Connect to the remote endpoint.
client.BeginConnect(remoteEP,
new AsyncCallback(ConnectCallback), client);
connectDone.WaitOne();
// Send test data to the remote device.
Send(client, "This is a test<EOF>");
sendDone.WaitOne();
// Receive the response from the remote device.
Receive(client);
receiveDone.WaitOne();
// Write the response to the console.
Console.WriteLine("Response received : {0}", response);
// Release the socket.
client.Shutdown(SocketShutdown.Both);
client.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void ConnectCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket client = (Socket)ar.AsyncState;
// Complete the connection.
client.EndConnect(ar);
Console.WriteLine("Socket connected to {0}",
client.RemoteEndPoint.ToString());
// Signal that the connection has been made.
connectDone.Set();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void Receive(Socket client)
{
try
{
// Create the state object.
StateObject state = new StateObject();
state.workSocket = client;
// Begin receiving the data from the remote device.
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void ReceiveCallback(IAsyncResult ar)
{
try
{
// Retrieve the state object and the client socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket client = state.workSocket;
// Read data from the remote device.
int bytesRead = client.EndReceive(ar);
//检验正文长度
//检验包头OXIFF
//获得包体长度
//根据包体长度和接收数据的长度来判断是否粘包
//验证通过后放进队列中
if (bytesRead > 0)
{
state.sb.Length = 0;
//state.sb = null;
// There might be more data, so store the data received so far.
state.sb.Append("从服务器接收的数据为：");
state.sb.Append(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
state.sb.Append("==");
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
//Console.WriteLine("从服务器接收的数据为：" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:mmm") + ":" + state.sb.ToString());
WriteFile(state.sb.ToString());
//当接收的字节数大于0的时候，再次调用回调函数来接收数据
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
else
{
// All the data has arrived; put it in response.
if (state.sb.Length > 1)
{
response = state.sb.ToString();
}
// Signal that all bytes have been received.
receiveDone.Set();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void Send(Socket client, 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.
client.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), client);
}
private static void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket client = (Socket)ar.AsyncState;
// Complete sending the data to the remote device.
int bytesSent = client.EndSend(ar);
Console.WriteLine("Sent {0} bytes to server.", bytesSent);
// Signal that all bytes have been sent.
sendDone.Set();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args)
{
StartClient();
return 0;
}
#region 写日志，日志的生成方式为按照固定大小生成
/// <summary>
/// 写日志文件
/// </summary>
/// <param name="data">日志文件内容</param>
public static void WriteFile(string data)
{
//创建一个AlgorithmLog文件夹来存储日志
string releaseLogPath = @"D:\vs2008Workspace\CSharp基础练习\AsynSocket\bin\Debug\Test\";
if (!Directory.Exists(releaseLogPath))
{
Directory.CreateDirectory(releaseLogPath);
}
string strCurrentTime = DateTime.Now.Year.ToString("0000") + "-" + DateTime.Now.Month.ToString("00") + "-" + DateTime.Now.Day.ToString("00");
strCurrentTime += " " + DateTime.Now.Hour.ToString("00") + ":" + DateTime.Now.Minute.ToString("00") + ":" + DateTime.Now.Second.ToString("00") + " ";
try
{
string releaseLogName = releaseLogPath + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
if (!File.Exists(releaseLogName))
{
FileStream fs = File.Create(releaseLogName);
fs.Close();
}
FileInfo fi = new FileInfo(releaseLogName);
if (fi.Length > 1024 * 1024 * 50) //50M
{
File.Move(releaseLogName, releaseLogPath + DateTime.Now.ToString("yyyyMMddHHmmss") + ".txt");
if (!File.Exists(releaseLogName)) { using (File.Create(releaseLogName)) { } }
}
FileStream fsWrite = new FileStream(releaseLogName, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
StreamWriter sr = new StreamWriter(fsWrite, System.Text.Encoding.Default);
sr.WriteLine(strCurrentTime + data);
sr.Dispose();
sr.Close();
fsWrite.Dispose();
fsWrite.Close();
}
catch (Exception ex)
{
WriteFile("WriteFile方法异常：" + ex.ToString());
return;
}
}
#endregion
}
}
[解决办法]
没有看你的代码（太长了），仅看最后这个列表，这看不出有问题。TCP的原理你要稍微接触一点，它与UDP相比，它就是“慢启动、自动粘包”的，它要保证数据可靠地发送到目的地，而且不会对网络造成冲击，所以它会自动缓冲一段时间，等待更多的数据然后一块儿发送出去。
[解决办法]
每100ms发送一次1234567890
并不能保证每秒正好发送10次