Question

C#中TCP进行同步套接字编程，服务器和客户端的工作流程（需要代码和图）

Answer 1

代码来了，。。
服务器:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Reflection;
using System.Diagnostics;
using System.Text.RegularExpressions;

namespace msgServer
{
public partial class frmServer : Form
{
private Socket socket;
private IPAddress myIP;
private IPEndPoint endPoint;
private int point;
private Socket clientSocket;
private Assembly ass = null;
private System.IO.Stream stream = null;
private System.Media.SoundPlayer pl;
private string txt;
private byte[] bs = new byte[512];
public frmServer()
{
InitializeComponent();
ass = Assembly.GetExecutingAssembly();
stream = ass.GetManifestResourceStream("msgServer.msg.wav");
pl = new System.Media.SoundPlayer(stream);
}

//字体选择
private void btnFont_Click(object sender, EventArgs e)
{
FontDialog font = new FontDialog();
font.ShowEffects = true;
font.ShowColor = true;
font.MinSize = 12;
font.Font = new Font("楷体_GB2312", 18, FontStyle.Bold);
font.Color = Color.Blue;

if (font.ShowDialog() == DialogResult.OK)
{
rtxtSend.Font = font.Font;
rtxtSend.ForeColor = font.Color;
}

}

//开始监听
private void btnStart_Click(object sender, EventArgs e)
{
System.Threading.Thread th1 = new System.Threading.Thread(ToConnect);
th1.Start();
}

//去连接
private void ToConnect()
{
try
{
myIP = IPAddress.Parse(txtIP.Text.Trim());//IP
point = Convert.ToInt32(txtPoint.Text.Trim());//Point
endPoint = new IPEndPoint(myIP, point); //终端

socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.Bind(endPoint);//绑定
socket.Listen(3); //最多3人同时连接

lblStatus.Text = "服务器已经运行...";

clientSocket = socket.Accept();//等待接受
//连接上时
if (clientSocket.Connected)
{
lblStatus.Text = "已经建立连接.";

while (true)
{
try
{
clientSocket.Receive(bs, bs.Length, 0);
pl.Play();
rtxtMsg.AppendText(System.Text.Encoding.Unicode.GetString(bs));
}
catch { lblStatus.Text = "连接已经断开."; }
}
}
}
catch { txtIP.Focus(); txtIP.SelectAll(); MessageBox.Show("IP error OR Point error"); }
}

//停止监听
private void btnStop_Click(object sender, EventArgs e)
{
try
{
socket.Close(3);
lblStatus.Text = "监听已经停止.";
}
catch
{
lblStatus.Text = "目前未建立连接.";
}
}

private void frmServer_KeyPress(object sender, KeyPressEventArgs e)
{

}

private void frmServer_KeyDown(object sender, KeyEventArgs e)
{
if ((e.Control && e.KeyCode == Keys.Enter) || (e.Alt && e.KeyCode == Keys.S))
{
btnSend.PerformClick();//单击发送
}
}

//发送消息
private void btnSend_Click(object sender, EventArgs e)
{
if (rtxtSend.Text.Trim() == "")
return;
else if (rtxtSend.Text.Trim().ToLower() == "clear()")
{
rtxtMsg.Clear();
rtxtSend.Text = "";
return;
}
else if (Regex.IsMatch(rtxtSend.Text.Trim().ToLower(), @"^[zoom(]+[\d]+[)]$"))
{
string str = rtxtSend.Text.ToLower();
int size = Convert.ToInt32(str.Substring(str.LastIndexOf('(') + 1,
str.IndexOf(')') - str.LastIndexOf('(') - 1));
rtxtMsg.Font = new Font("宋体", size,FontStyle.Bold);
return;
}
else if (Regex.IsMatch(rtxtSend.Text.Trim().ToLower(), @"^[down(]+[\d]+[)]$"))
{
string str = rtxtSend.Text.ToLower();
string size = str.Substring(str.LastIndexOf('(') + 1,str.IndexOf(')') - str.LastIndexOf('(') - 1);

if (Convert.ToInt32(size) > rtxtMsg.Text.Length)
return;

}
else if (Regex.IsMatch(rtxtSend.Text.Trim().ToLower(), @"^[up(]+[\d]+[)]$"))
{
string str = rtxtSend.Text.ToLower();
string size = str.Substring(str.LastIndexOf('(') + 1,str.IndexOf(')') - str.LastIndexOf('(') - 1);

}
else if (rtxtSend.Text.Trim().ToLower() == "exit(0)")
{
this.Close();
return;
}

try
{
byte[] bs = new byte[512];
string user = null;
if (txtUser.Text.Trim() == "在此输入你的名字" || txtUser.Text.Trim() == "")
{
user = "我";
bs = Encoding.Unicode.GetBytes(string.Format("对方说:({0})\r\n{1}\r\n",DateTime.Now.ToString(), rtxtSend.Text.Trim()));
}
else
{
bs = Encoding.Unicode.GetBytes(string.Format("{0}说:({1})\r\n{2}\r\n", txtUser.Text.Trim(),DateTime.Now.ToString(), rtxtSend.Text.Trim()));
user = txtUser.Text.Trim();
}
clientSocket.Send(bs, bs.Length, 0);//发送
txt = string.Format("{0}说:({1})\r\n{2}\r\n", user, DateTime.Now.ToString(),rtxtSend.Text.Trim());
int tempLen = rtxtMsg.Text.Length;
rtxtMsg.AppendText(txt);
rtxtMsg.Select(tempLen, txt.Length);
rtxtMsg.SelectionFont = new Font("宋体", 10);
rtxtMsg.SelectionColor = Color.Red;
rtxtSend.Clear();
}
catch { MessageBox.Show("未建立连接，无法发送数据!"); }
}

//关闭Socket
private void frmServer_FormClosing(object sender, FormClosingEventArgs e)
{
try
{
//关闭连接
socket.Close(3);
}
catch (Exception) { }
finally
{
foreach (Process p in Process.GetProcesses())
{
if (p.ProcessName == Application.ProductName)
p.Kill();
}
}
}

private void frmServer_Load(object sender, EventArgs e)
{
foreach (Process p in Process.GetProcesses())
{
if (p.ProcessName == Application.ProductName)//已经启动
{
if (p.Id != Process.GetCurrentProcess().Id)//不是当前进程
{
p.Kill();
}
}
}
}

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
this.TopMost = checkBox1.Checked;
}
}
}

客户端:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Diagnostics;
using System.Text.RegularExpressions;

namespace smgClient
{
public partial class frmClient : Form
{
private IPAddress IP;//ip
private EndPoint endpoint;//point
private Socket socket;//socket
private System.IO.Stream stream = null;
private System.Reflection.Assembly ass = null;
private System.Media.SoundPlayer pl = null;
private string txt;
private byte[] bs = new byte[512];

public frmClient()
{
InitializeComponent();
ass = System.Reflection.Assembly.GetExecutingAssembly();
stream = ass.GetManifestResourceStream("smgClient.msg.wav");
pl = new System.Media.SoundPlayer(stream);
}

//请求连接
private void btnRequestConnect_Click(object sender, EventArgs e)
{
System.Threading.Thread th = new System.Threading.Thread(this.ToConnect);
th.Start();
}

//连接服务器
private void ToConnect()
{
try
{
IP = IPAddress.Parse(txtIP.Text.Trim());
int point = Convert.ToInt32(txtPoint.Text.Trim());
endpoint = new IPEndPoint(IP, point);
//建立Socket
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//建立连接
socket.Connect(endpoint);
//连接成功
lblStatus.Text = "连接成功.";

while (true)
{
socket.Receive(bs, bs.Length, 0);
pl.Play();
rtxtMsg.AppendText(System.Text.Encoding.Unicode.GetString(bs));
}
}
catch (FormatException)
{ MessageBox.Show("IP error OR Point error"); }
catch (ArgumentNullException)
{ MessageBox.Show("IP error OR Point error"); }
catch (Exception)
{
lblStatus.Text = "连接失败，原因: 服务器已停止.";
}
}

//字体
private void btnFont_Click(object sender, EventArgs e)
{
FontDialog font = new FontDialog();
font.ShowEffects = true;
font.ShowColor = true;
font.MinSize = 12;
font.Font = new Font("楷体_GB2312", 18, FontStyle.Bold);
font.Color = Color.Blue;

if (font.ShowDialog() == DialogResult.OK)
{
rtxtSend.Font = font.Font;
rtxtSend.ForeColor = font.Color;
}
}

//关闭连接
private void btnCloseConnect_Click(object sender, EventArgs e)
{
try
{
socket.Close();
lblStatus.Text = "连接已经关闭.";
}
catch
{
lblStatus.Text = "目前未建立连接.";
}
}

//发送消息
private void btnSend_Click(object sender, EventArgs e)
{
if (rtxtSend.Text.Trim() == "")
return;
else if (rtxtSend.Text.Trim().ToLower() == "clear()")
{
rtxtMsg.Clear();
rtxtSend.Text = "";
return;
}
else if (Regex.IsMatch(rtxtSend.Text.Trim().ToLower(), @"^[zoom(]+[\d]+[)]$"))
{
string str = rtxtSend.Text.ToLower();
int size = Convert.ToInt32(str.Substring(str.LastIndexOf('(') + 1,
str.IndexOf(')') - str.LastIndexOf('(') - 1));
rtxtMsg.Font = new Font("宋体", size, FontStyle.Bold);
return;
}
else if (Regex.IsMatch(rtxtSend.Text.Trim().ToLower(), @"^[down(]+[\d]+[)]$"))
{
string str = rtxtSend.Text.ToLower();
string size = str.Substring(str.LastIndexOf('(') + 1, str.IndexOf(')') - str.LastIndexOf('(') - 1);

if (Convert.ToInt32(size) > rtxtMsg.Text.Length)
return;

}
else if (Regex.IsMatch(rtxtSend.Text.Trim().ToLower(), @"^[up(]+[\d]+[)]$"))
{
string str = rtxtSend.Text.ToLower();
string size = str.Substring(str.LastIndexOf('(') + 1, str.IndexOf(')') - str.LastIndexOf('(') - 1);

}
else if (rtxtSend.Text.Trim().ToLower() == "exit(0)")
{
this.Close();
return;
}

try
{
byte[] bs = new byte[512];
string user = null;
if (txtUser.Text.Trim() == "在此输入你的名字" || txtUser.Text.Trim() == "")
{
user = "我";
bs = Encoding.Unicode.GetBytes(string.Format("对方说:({0})\r\n{1}\r\n", DateTime.Now.ToString(),rtxtSend.Text.Trim()));
}
else
{
bs = Encoding.Unicode.GetBytes(string.Format("{0}说:({1})\r\n{2}\r\n", txtUser.Text.Trim(),DateTime.Now.ToString(),rtxtSend.Text.Trim()));
user = txtUser.Text.Trim();
}

socket.Send(bs, bs.Length, 0);//发送

txt = string.Format("{0}说:({1})\r\n{2}\r\n", user, DateTime.Now.ToString(), rtxtSend.Text.Trim());
int tempLen = rtxtMsg.Text.Length;
rtxtMsg.AppendText(txt);
rtxtMsg.Select(tempLen, txt.Length);
rtxtMsg.SelectionFont = new Font("宋体", 10);
rtxtMsg.SelectionColor = Color.Red;
rtxtSend.Clear();
}
catch(Exception ex)
{ MessageBox.Show("连接尚未建立！无法发送数据!" + ex.Message); }
}

//避开打开多个
private void frmClient_Load(object sender, EventArgs e)
{
foreach (Process p in Process.GetProcesses())
{
if (p.ProcessName == Application.ProductName)//有进程
{
if (p.Id != Process.GetCurrentProcess().Id)//不是当前进程
{
p.Kill();
}
}
}
}

private void frmClient_FormClosing(object sender, FormClosingEventArgs e)
{
try
{
socket.Close();
}
catch(Exception) { }
finally
{
foreach (Process p in Process.GetProcesses())
{
if (p.ProcessName == Application.ProductName)
p.Kill();
}
}
}

private void frmClient_KeyDown(object sender, KeyEventArgs e)
{
if ((e.Control && e.KeyCode == Keys.Enter) || (e.Alt && e.KeyCode == Keys.S))
{
btnSend.PerformClick();
}
}

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
this.TopMost = checkBox1.Checked;
}
}
}

Answer 2

s端：建立套接字，绑定端口，监听，发送及接收；
c端：建立套接字，基于端口连接，发送及接收。