网络聊天工具Socket编程心得

首先要了解TCP协议通信的流程：
1。服务器端首先创建服务器套接字
2。服务器套接字监听一个端口，等待客户端的请求
3。客户端创建一个客户端套接字
4。客户端向服务器发送请求
5。服务器确认与客户端的连接
6。客户端和服务器利用建立的连接进行通信
7。通信完毕后，客户端和服务器关闭各自的连接

Socket编程基础：
一。利用Socket建立服务器程序
1。创建一个服务器套接字，用IP地址和端口初始化服务器

IPAddress ipAddress = IPAddress.Parse("127.0.0.1");
TcpListener listener = new TcpListener(ipAddress, 1234);
2。监听服务器端口

listener.Start();
3。确认与客户端的连接

Socket socket = listener.AcceptSocket();
4。取得客户端传送过来的信息

//将传送过来的信息存入字节数组中
byte[] buffer = new byte[1024];
socket.Receive(buffer);
5。处理客户端的请求并回应客户端

string message = "hello";
byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(message.ToCharArray());
socket.Send(outbytes, message.Length, 0);
6。断开客户端的连接，释放客户端连接

socket.Close();
7。关闭服务器，释放服务器连接

listener.Close();

二。利用Socket建立客户端程序
1。创建客户端套接字

TcpClient tcpClient = new TcpClient();
2。连接服务器

tcpClient.Connect(IPAddress.Parse("127.0.0.1"), 1234);
3。得到与服务器通信的流通道

NetworkStream stream = tcpClient.GetStream();
4。向服务器发送数据

string cmd = "";
byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(cmd.ToCharArray());
stream.Write(outbytes, 0, outbytes.Length);
5。接收从服务器发回的数据

byte[] buffer = new byte[1024];
int len = stream.Read(buffer, 0, buffer.Length);
string msg = System.Text.Encoding.ASCII.GetString(buffer, 0, len);
6。断开连接

tcpClient.Close();

服务器端窗体ChatServer.cs:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace ChatServer
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class ChatServerForm : System.Windows.Forms.Form
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
// The port
static int port = 1234;
private TcpListener listener;
private Socket tmpSocket;
// The maximal clients the server can hold
static int MaxNum = 100;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox txtHost;
private System.Windows.Forms.TextBox txtPort;
private System.Windows.Forms.Button btnStart;
private System.Windows.Forms.Button btnExit;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.ComboBox cmbCurUserList;
private System.Windows.Forms.ListBox lstInfo;
// The array clients is to save the online clients
static ArrayList clients = new ArrayList();

public ChatServerForm()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.txtHost = new System.Windows.Forms.TextBox();
this.txtPort = new System.Windows.Forms.TextBox();
this.btnStart = new System.Windows.Forms.Button();
this.btnExit = new System.Windows.Forms.Button();
this.label3 = new System.Windows.Forms.Label();
this.cmbCurUserList = new System.Windows.Forms.ComboBox();
this.lstInfo = new System.Windows.Forms.ListBox();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(32, 32);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(54, 17);
this.label1.TabIndex = 0;
this.label1.Text = "主机号：";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(32, 72);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(54, 17);
this.label2.TabIndex = 1;
this.label2.Text = "端口号：";
//
// txtHost
//
this.txtHost.Location = new System.Drawing.Point(96, 24);
this.txtHost.Name = "txtHost";
this.txtHost.Size = new System.Drawing.Size(128, 21);
this.txtHost.TabIndex = 2;
this.txtHost.Text = "";
//
// txtPort
//
this.txtPort.Location = new System.Drawing.Point(96, 64);
this.txtPort.Name = "txtPort";
this.txtPort.Size = new System.Drawing.Size(128, 21);
this.txtPort.TabIndex = 3;
this.txtPort.Text = "";
//
// btnStart
//
this.btnStart.Location = new System.Drawing.Point(256, 24);
this.btnStart.Name = "btnStart";
this.btnStart.TabIndex = 4;
this.btnStart.Text = "启动";
this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
//
// btnExit
//
this.btnExit.Location = new System.Drawing.Point(256, 64);
this.btnExit.Name = "btnExit";
this.btnExit.TabIndex = 5;
this.btnExit.Text = "退出";
this.btnExit.Click += new System.EventHandler(this.btnExit_Click);
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(24, 112);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(91, 17);
this.label3.TabIndex = 6;
this.label3.Text = "当前在线用户：";
//
// cmbCurUserList
//
this.cmbCurUserList.Location = new System.Drawing.Point(120, 112);
this.cmbCurUserList.Name = "cmbCurUserList";
this.cmbCurUserList.Size = new System.Drawing.Size(136, 20);
this.cmbCurUserList.TabIndex = 7;
//
// lstInfo
//
this.lstInfo.ItemHeight = 12;
this.lstInfo.Location = new System.Drawing.Point(0, 144);
this.lstInfo.Name = "lstInfo";
this.lstInfo.Size = new System.Drawing.Size(344, 160);
this.lstInfo.TabIndex = 8;
//
// ChatServerForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(344, 301);
this.Controls.Add(this.lstInfo);
this.Controls.Add(this.cmbCurUserList);
this.Controls.Add(this.label3);
this.Controls.Add(this.btnExit);
this.Controls.Add(this.btnStart);
this.Controls.Add(this.txtPort);
this.Controls.Add(this.txtHost);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Name = "ChatServerForm";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new ChatServerForm());
}

private void Form1_Load(object sender, System.EventArgs e)
{
this.txtPort.ReadOnly = true;
this.txtPort.Text = port.ToString();
this.txtHost.Text = "127.0.0.1";
}

private void btnStart_Click(object sender, System.EventArgs e)
{
try
{
IPAddress ip = IPAddress.Parse(this.txtHost.Text);
listener = new TcpListener(ip, port); //创建服务器套字
listener.Start(); //开始监听服务器端口
lstInfo.Items.Add("服务器已经启动，正在监听" + txtHost.Text + ":" + txtPort.Text);

//启动一个新的线程，执行方法StartListen，以便在一个独立的进程中执行确认于客户端连接的操作.
Thread thread = new Thread(new ThreadStart(this.StartListen));
thread.Start();
btnStart.Enabled = false;
}
catch(Exception ex)
{
lstInfo.Items.Add(ex.Message);
}
}

private void StartListen()
{
while(true)
{
try
{
//当接受到一个客户端请求时,确认与客户端的连接
Socket socket = listener.AcceptSocket();

//用tmpSocket保存发出请求的客户端实例
tmpSocket = socket;

if (clients.Count >= MaxNum)
{
tmpSocket.Close();
}
else
{
//启动一个新的线程,执行方法this.ServiceClient,处理用户相应的要求
Thread clientService = new Thread(new ThreadStart(this.ServiceClient));
clientService.Start();
}
}
catch(Exception ex)
{
lstInfo.Items.Add(ex.Message);
}
}
}

private void ServiceClient()
{
//定义一个数组,用于接收从客户端发送过来的数据,每次所能接收的数据包的最大长度为1024字节
byte[] buffer = new byte[1024];
Socket clientSocket = tmpSocket;
bool keepConnect = true;

//用循环不断地与客户端进行交互,直到客户端发出Exit命令,将keepConnect设置为false
//退出循环,关闭连接,中止当前线程
while(keepConnect)
{
//接收数据并存入buffer数组中
clientSocket.Receive(buffer);
//将字符数组转化为字符串
string clientCommand = System.Text.Encoding.ASCII.GetString(buffer);
string[] tokens = clientCommand.Split('|');
//tokens[0]中保存了命令标识符(CONN或CHAT或PRIV或EXIT)
if (tokens[0] == "CONN") // CONN|用户名|
{
Client _client = new Client(tokens[1], clientSocket);
clients.Add(_client);
lstInfo.Items.Add(tokens[1] + " has joined");
//将刚连接的用户名加入到当前在线用户列表中
this.cmbCurUserList.Items.Add(tokens[1]);
//对每一个在线用户发送JOIN和LIST信息命令,以此来更新客户端的在线用户列表
for(int i=0; i<clients.Count; i++)
{
Client client = (Client)clients[i];
//向客户端发送JOIN命令,以此来提示有新的客户进入聊天室
SendToClient(client, "JOIN|" + tokens[1] + "|");
Thread.Sleep(100);
string msgUsers = "LIST|" + GetUserList();
//向客户端发送LIST命令,以此来更新客户端的当前在线用户列表
SendToClient(client, msgUsers);
}
}
if (tokens[0] == "CHAT") // CHAT|用户名:内容|
{
//向所有当前在线用户转发此信息
for (int i=0; i<clients.Count; i++)
{
Client client = (Client)clients[i];
//将"发送者的用户名:发送内容"转发给用户
SendToClient(client, tokens[1]);
}
}
if (tokens[0] == "PRIV") // PRIV|发送者用户名|接受者用户名|发送内容
{
string sender = tokens[1];
string receiver = tokens[2];
string content = tokens[3];

string message = sender + "send to " + receiver + ": " + content;

//仅把信息转发给发送者和接收者
for (int i=0; i<clients.Count; i++)
{
Client client = (Client)clients[i];
if (client.Name == tokens[2])
{
this.SendToClient(client, message);
}
if (client.Name == tokens[1])
{
this.SendToClient(client, message);
}
}
}
if (tokens[0] == "EXIT") // EXIT|用户名
{
for (int i=0; i<clients.Count; i++)
{
Client client = (Client)clients[i];
string message = tokens[1] + " has gone!";
this.SendToClient(client, message);
if (client.Name == tokens[1])
{
//将该用户从对应的Client对象从clients数组中删除
clients.RemoveAt(i);
//将该用户名从当前在线用户列表中删除
this.cmbCurUserList.Items.Remove(client.Name);
//向客户端发送QUIT命令，以此来关闭客户端程序
message = "QUIT|";
this.SendToClient(client, message);
}
}
for (int i=0;i<clients.Count;i++)
{
Client client = (Client)clients[i];
string message = "LIST|" + GetUserList();
this.SendToClient(client, message);
}
this.lstInfo.Items.Add(tokens[1] + " has gone!");
//断开与该用户的连接
clientSocket.Close();
keepConnect = false;
}

}
}

//实现向客户端发送命令请求的功能
private void SendToClient(Client client, string msg)
{
System.Byte[] message = System.Text.Encoding.ASCII.GetBytes(msg.ToCharArray());
client.ClientSocket.Send(message, message.Length, 0);
}

//以 username1|username2|username3| 的形式返回当前在线用户名列表
private string GetUserList()
{
string list = "";
for (int i=0; i<clients.Count; i++)
{
Client client = (Client)clients[i];
list += client.Name + "|";
}
return list;
}

private void btnExit_Click(object sender, System.EventArgs e)
{
this.Close();
Application.ExitThread();
Application.Exit();
}

//定义一个Client类,每个当前在线用户都对应这它的一个实例,它包含了当前在线用户名和该用户
//与服务器连接的Socket对象,
public class Client
{
string name;
Socket clSocket;

public Client(string _name, Socket _socket)
{
name = _name;
clSocket = _socket;
}

public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
public Socket ClientSocket
{
get
{
return clSocket;
}
set
{
clSocket = value;
}
}
}
}
}

客户端主窗体：ChatClient.cs:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace ChatClient
{
/// <summary>
/// ChatClientForm 的摘要说明。
/// </summary>
public class ChatClientForm : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox txtAlias;
private System.Windows.Forms.ListBox lstContent;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.ListBox lstUsers;
private System.Windows.Forms.CheckBox chkPrivate;
private System.Windows.Forms.TextBox txtSend;
private System.Windows.Forms.Button btnSend;
private System.Windows.Forms.Button btnExit;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

private TcpClient tcpClient; //与服务器的连接
private NetworkStream stream; //与服务器数据交互的流通道
private string userAlias; //用户名
private bool isPrivate = false; //是否为私聊

[STAThread]
static void Main()
{
Application.Run(new ChatClientForm());
}

public ChatClientForm()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.txtAlias = new System.Windows.Forms.TextBox();
this.lstContent = new System.Windows.Forms.ListBox();
this.label2 = new System.Windows.Forms.Label();
this.lstUsers = new System.Windows.Forms.ListBox();
this.chkPrivate = new System.Windows.Forms.CheckBox();
this.txtSend = new System.Windows.Forms.TextBox();
this.btnSend = new System.Windows.Forms.Button();
this.btnExit = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(104, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(42, 17);
this.label1.TabIndex = 0;
this.label1.Text = "昵称：";
//
// txtAlias
//
this.txtAlias.Location = new System.Drawing.Point(208, 8);
this.txtAlias.Name = "txtAlias";
this.txtAlias.ReadOnly = true;
this.txtAlias.TabIndex = 1;
this.txtAlias.Text = "";
//
// lstContent
//
this.lstContent.ItemHeight = 12;
this.lstContent.Location = new System.Drawing.Point(0, 40);
this.lstContent.Name = "lstContent";
this.lstContent.Size = new System.Drawing.Size(432, 172);
this.lstContent.TabIndex = 2;
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(0, 224);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(116, 17);
this.label2.TabIndex = 3;
this.label2.Text = "当前在线用户列表：";
//
// lstUsers
//
this.lstUsers.ItemHeight = 12;
this.lstUsers.Location = new System.Drawing.Point(0, 240);
this.lstUsers.Name = "lstUsers";
this.lstUsers.Size = new System.Drawing.Size(120, 100);
this.lstUsers.TabIndex = 4;
//
// chkPrivate
//
this.chkPrivate.Location = new System.Drawing.Point(136, 240);
this.chkPrivate.Name = "chkPrivate";
this.chkPrivate.TabIndex = 5;
this.chkPrivate.Text = "悄悄话";
this.chkPrivate.CheckedChanged += new System.EventHandler(this.chkPrivate_CheckedChanged);
//
// txtSend
//
this.txtSend.Location = new System.Drawing.Point(136, 272);
this.txtSend.Name = "txtSend";
this.txtSend.Size = new System.Drawing.Size(288, 21);
this.txtSend.TabIndex = 6;
this.txtSend.Text = "";
//
// btnSend
//
this.btnSend.Location = new System.Drawing.Point(136, 312);
this.btnSend.Name = "btnSend";
this.btnSend.TabIndex = 7;
this.btnSend.Text = "发送";
this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
//
// btnExit
//
this.btnExit.Location = new System.Drawing.Point(344, 312);
this.btnExit.Name = "btnExit";
this.btnExit.TabIndex = 8;
this.btnExit.Text = "离开";
this.btnExit.Click += new System.EventHandler(this.btnExit_Click);
//
// ChatClientForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(432, 349);
this.Controls.Add(this.btnExit);
this.Controls.Add(this.btnSend);
this.Controls.Add(this.txtSend);
this.Controls.Add(this.chkPrivate);
this.Controls.Add(this.lstUsers);
this.Controls.Add(this.label2);
this.Controls.Add(this.lstContent);
this.Controls.Add(this.txtAlias);
this.Controls.Add(this.label1);
this.Name = "ChatClientForm";
this.Text = "ChatClientForm";
this.Load += new System.EventHandler(this.ChatClientForm_Load);
this.ResumeLayout(false);

}
#endregion

private void ChatClientForm_Load(object sender, System.EventArgs e)
{
try
{
Login dlgLogin = new Login();
DialogResult result = dlgLogin.ShowDialog();
if (result == DialogResult.OK)
{
this.userAlias = dlgLogin.Alias;
this.txtAlias.Text = userAlias;

this.tcpClient = dlgLogin.tcpClient;
stream = tcpClient.GetStream();
dlgLogin.Close();
}
else
{
lstUsers.Enabled = false;
txtSend.ReadOnly = true;
btnSend.Enabled = false;
dlgLogin.Close();
}

//启动一个新的进程，执行方法this.ServerResponse,以便来响应从服务器发回的信息
Thread thread = new Thread(new ThreadStart(this.ServerResponse));
thread.Start();

string cmd = "CONN|" + this.userAlias + "|";
byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(cmd.ToCharArray());

//利用NetworkStream的Write方法传送
stream.Write(outbytes, 0, outbytes.Length);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

private void ServerResponse()
{
byte[] buffer = new byte[1024];
string msg;
int len;
try
{
if (!stream.CanRead)
{
return;
}

while (true)
{
len = stream.Read(buffer, 0, buffer.Length);
msg = System.Text.Encoding.ASCII.GetString(buffer, 0, len);
msg.Trim();
string[] tokens = msg.Split('|');

if (tokens[0] == "LIST") //LIST|用户名1|用户名2|
{
lstUsers.Items.Clear();
for (int i=0; i<tokens.Length-1; i++)
{
lstUsers.Items.Add(tokens[i].Trim());
}
}

if (tokens[0] == "JOIN") // JOIN|刚刚登录的用户名
{
this.lstContent.Items.Add(tokens[1] + " has enter the chatroom!");
}

if (tokens[0] == "QUIT")
{
break;
}

if (tokens[0]!="LIST" && tokens[0]!="JOIN" && tokens[0]!="QUIT")
{
lstContent.Items.Add(msg);
}
}
tcpClient.Close(); //关闭连接
this.Close(); //关闭客户端程序
}
catch (Exception ex)
{
lstContent.Items.Add(ex.Message);
}
}

private void chkPrivate_CheckedChanged(object sender, System.EventArgs e)
{
if (this.chkPrivate.Checked)
{
this.isPrivate = true;
}
else
{
this.isPrivate = false;
}
}

private void btnSend_Click(object sender, System.EventArgs e)
{
try
{
if (!this.isPrivate)
{
string message = "CHAT|" + this.userAlias + ":" + this.txtSend.Text + "|";
this.txtSend.Text = "";
this.txtSend.Focus();
byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(message.ToCharArray());
stream.Write(outbytes, 0, outbytes.Length);
}
else
{
if (lstUsers.SelectedIndex == -1)
{
MessageBox.Show("请在列表中选择一个用户", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
string receiver = this.lstUsers.SelectedItem.ToString();
string message = "PRIV|" + this.userAlias + "|" + receiver + "|" + this.txtSend.Text + "|";
this.txtSend.Text = "";
this.txtSend.Focus();
byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(message.ToCharArray());
stream.Write(outbytes, 0, outbytes.Length);
}
}
catch (Exception ex)
{
this.lstContent.Items.Add("网络发生错误！");
}
}

private void btnExit_Click(object sender, System.EventArgs e)
{
string message = "EXIT|" + this.userAlias + "|";
byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(message.ToCharArray());
stream.Write(outbytes, 0, outbytes.Length);
}

}
}

客户端登录窗体：Login.cs

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;

namespace ChatClient
{
/// <summary>
/// Login 的摘要说明。
/// </summary>
public class Login : System.Windows.Forms.Form
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

//tcpClient是Login的一个公有成员，它用于创建客户端套接字
public TcpClient tcpClient;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Button btnLogin;
private System.Windows.Forms.Button btnCancel;
private System.Windows.Forms.TextBox txtHost;
private System.Windows.Forms.TextBox txtPort;
private System.Windows.Forms.TextBox txtName;

//Alias是Login的一个公有成员，它向ChatClient窗体传递用户名
public string Alias = "";

public Login()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.txtHost = new System.Windows.Forms.TextBox();
this.txtPort = new System.Windows.Forms.TextBox();
this.txtName = new System.Windows.Forms.TextBox();
this.btnLogin = new System.Windows.Forms.Button();
this.btnCancel = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(16, 32);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(79, 17);
this.label1.TabIndex = 0;
this.label1.Text = "服务器地址：";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(16, 72);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(54, 17);
this.label2.TabIndex = 1;
this.label2.Text = "端口号：";
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(16, 112);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(54, 17);
this.label3.TabIndex = 2;
this.label3.Text = "用户名：";
//
// txtHost
//
this.txtHost.Location = new System.Drawing.Point(104, 24);
this.txtHost.Name = "txtHost";
this.txtHost.Size = new System.Drawing.Size(144, 21);
this.txtHost.TabIndex = 3;
this.txtHost.Text = "127.0.0.1";
//
// txtPort
//
this.txtPort.Location = new System.Drawing.Point(104, 64);
this.txtPort.Name = "txtPort";
this.txtPort.ReadOnly = true;
this.txtPort.Size = new System.Drawing.Size(144, 21);
this.txtPort.TabIndex = 4;
this.txtPort.Text = "1234";
//
// txtName
//
this.txtName.Location = new System.Drawing.Point(104, 104);
this.txtName.Name = "txtName";
this.txtName.Size = new System.Drawing.Size(144, 21);
this.txtName.TabIndex = 5;
this.txtName.Text = "";
//
// btnLogin
//
this.btnLogin.DialogResult = System.Windows.Forms.DialogResult.OK;
this.btnLogin.Location = new System.Drawing.Point(40, 160);
this.btnLogin.Name = "btnLogin";
this.btnLogin.TabIndex = 6;
this.btnLogin.Text = "登录";
this.btnLogin.Click += new System.EventHandler(this.btnLogin_Click);
//
// btnCancel
//
this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
this.btnCancel.Location = new System.Drawing.Point(168, 160);
this.btnCancel.Name = "btnCancel";
this.btnCancel.TabIndex = 7;
this.btnCancel.Text = "取消";
this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
//
// Login
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(292, 229);
this.Controls.Add(this.btnCancel);
this.Controls.Add(this.btnLogin);
this.Controls.Add(this.txtName);
this.Controls.Add(this.txtPort);
this.Controls.Add(this.txtHost);
this.Controls.Add(this.label3);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Name = "Login";
this.Text = "Login";
this.Load += new System.EventHandler(this.Login_Load);
this.ResumeLayout(false);

}
#endregion

private void Login_Load(object sender, System.EventArgs e)
{

}

private void btnCancel_Click(object sender, System.EventArgs e)
{
ChatClient.Login.ActiveForm.Close();
}

private void btnLogin_Click(object sender, System.EventArgs e)
{
this.txtName.Text = this.txtName.Text.Trim();
if (this.txtName.Text.Length == 0)
{
MessageBox.Show("请输入您的昵称！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
this.txtName.Focus();
return;
}
try
{
tcpClient = new TcpClient();

//向指定的IP地址的服务器发出连接请求
tcpClient.Connect(IPAddress.Parse(txtHost.Text), Int32.Parse(txtPort.Text));
this.Alias = txtName.Text;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}