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局域網QQ（C#版）

編輯：關於C語言

本通訊程序沒有服務端和客戶端之分，局域網的計算機運行同一程序即可通信。
由於水平有限，目前版本還很菜，只可以實現基本的聊天功能和顯示在線用戶功能。
准備添加傳送文件、聊天日志、可選參數等功能。
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.Text;
using System.Threading;

namespace myQQ
{
/// <summary>
/// Form1 的摘要說明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
public bool runing=false; //標志
public UdpClient listen=new UdpClIEnt(2525);
public IPEndPoint End;
public IPAddress groupAddress=IPAddress.Parse("255.255.255.255"); //廣播地址
public int groupPort=2525; //廣播端口
public string MachineName;
public string MachineIP;
public string romeName;
public string romeIP;
public string romeCon;

private System.Windows.Forms.ListBox box;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.TextBox t_rec;
private System.Windows.Forms.TextBox t_send;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button newmsg;
/// <summary>
/// 必需的設計器變量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
   //
   // Windows 窗體設計器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 調用後添加任何構造函數代碼
   //
}

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

#region Windows 窗體設計器生成的代碼
/// <summary>
/// 設計器支持所需的方法 - 不要使用代碼編輯器修改
/// 此方法的內容。
/// </summary>
private void InitializeComponent()
{
   this.box = new System.Windows.Forms.ListBox();
   this.t_rec = new System.Windows.Forms.TextBox();
   this.label1 = new System.Windows.Forms.Label();
   this.label2 = new System.Windows.Forms.Label();
   this.t_send = new System.Windows.Forms.TextBox();
   this.button1 = new System.Windows.Forms.Button();
   this.button3 = new System.Windows.Forms.Button();
   this.label3 = new System.Windows.Forms.Label();
   this.button2 = new System.Windows.Forms.Button();
   this.newmsg = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // box
   //
   this.box.ItemHeight = 12;
   this.box.Location = new System.Drawing.Point(0, 32);
   this.box.Name = "box";
   this.box.Size = new System.Drawing.Size(200, 352);
   this.box.TabIndex = 0;
   //
   // t_rec
   //
   this.t_rec.BackColor = System.Drawing.SystemColors.InactiveBorder;
   this.t_rec.ForeColor = System.Drawing.Color.FromArgb(((System.Byte)(192)), ((System.Byte)(64)), ((System.Byte)(0)));
   this.t_rec.Location = new System.Drawing.Point(208, 56);
   this.t_rec.Multiline = true;
   this.t_rec.Name = "t_rec";
   this.t_rec.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
   this.t_rec.Size = new System.Drawing.Size(328, 136);
   this.t_rec.TabIndex = 1;
   this.t_rec.Text = "";
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(208, 40);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(120, 16);
   this.label1.TabIndex = 2;
   this.label1.Text = "接收：";
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(208, 200);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(120, 16);
   this.label2.TabIndex = 2;
   this.label2.Text = "發送：";
   //
   // t_send
   //
   this.t_send.Location = new System.Drawing.Point(208, 216);
   this.t_send.Multiline = true;
   this.t_send.Name = "t_send";
   this.t_send.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
   this.t_send.Size = new System.Drawing.Size(328, 112);
   this.t_send.TabIndex = 1;
   this.t_send.Text = "";
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(440, 344);
   this.button1.Name = "button1";
   this.button1.Size = new System.Drawing.Size(75, 32);
   this.button1.TabIndex = 3;
   this.button1.Text = "發送";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // button3
   //
   this.button3.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
   this.button3.Location = new System.Drawing.Point(88, 3);
   this.button3.Name = "button3";
   this.button3.Size = new System.Drawing.Size(56, 23);
   this.button3.TabIndex = 4;
   this.button3.Text = "刷新";
   this.button3.Click += new System.EventHandler(this.button3_Click);
   //
   // label3
   //
   this.label3.Font = new System.Drawing.Font("宋體", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.label3.ForeColor = System.Drawing.Color.Blue;
   this.label3.Location = new System.Drawing.Point(8, 8);
   this.label3.Name = "label3";
   this.label3.Size = new System.Drawing.Size(80, 16);
   this.label3.TabIndex = 5;
   this.label3.Text = "在線用戶：";
   //
   // button2
   //
   this.button2.Location = new System.Drawing.Point(360, 344);
   this.button2.Name = "button2";
   this.button2.Size = new System.Drawing.Size(75, 32);
   this.button2.TabIndex = 6;
   this.button2.Text = "清空";
   this.button2.Click += new System.EventHandler(this.button2_Click);
   //
   // newmsg
   //
   this.newmsg.Location = new System.Drawing.Point(208, 56);
   this.newmsg.Name = "newmsg";
   this.newmsg.Size = new System.Drawing.Size(328, 136);
   this.newmsg.TabIndex = 7;
   this.newmsg.Text = "有新消息了！";
   this.newmsg.Click += new System.EventHandler(this.newmsg_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClIEntSize = new System.Drawing.Size(544, 389);
   this.Controls.Add(this.button2);
   this.Controls.Add(this.label3);
   this.Controls.Add(this.button3);
   this.Controls.Add(this.button1);
   this.Controls.Add(this.label1);
   this.Controls.Add(this.box);
   this.Controls.Add(this.label2);
   this.Controls.Add(this.t_send);
   this.Controls.Add(this.t_rec);
   this.Controls.Add(this.newmsg);
   this.Name = "Form1";
   this.Text = "小y";
   this.Closing += new System.ComponentModel.CancelEventHandler(this.Form1_Closing);
   this.Load += new System.EventHandler(this.Form1_Load);
   this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 應用程序的主入口點。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void Form1_Load(object sender, System.EventArgs e)
{


   End=new IPEndPoint(groupAddress,groupPort);
   //初始化計算機名和端口
   IPHostEntry myentry=Dns.GetHostByName(Dns.GetHostName());
   IPAddress myaddress=new IPAddress(myentry.AddressList[0].Address);
   MachineName=Dns.GetHostName();
   MachineIP=myaddress.ToString();

box.Items.Add("IP 主機名");

   //開啟監聽線程
   runing=true;
   Thread myThread=new Thread(new ThreadStart(this.ListenPort));
   myThread.Start();

   //發送上線信息
   string sends="0&"+machineIP+"&"+machineName+"&"+MachineIP;
   SendPack(sends);
}

//偵聽指定端口的廣播地址UDP包
public void ListenPort()
{
   IPEndPoint tempEnd=new IPEndPoint(IPAddress.Any,2525);
   while(runing)
   {
    Application.DoEvents();
    try
    {
     byte[] recb=listen.Receive(ref tempEnd);

     // 檢查所接收到的信息
     checkMessage(recb);
    }
    catch(Exception e)
    {
     MessageBox.Show(e.Message.ToString());
     break;
    }

   }
   listen.Close();
   box.Items.Add("線程已經退出！");
   runing=false;
}

//循環接收包
public void checkMessage(byte[] recbb)
{
   string recStr=Encoding.Default.GetString(recbb);
   string[] rec=recStr.Split('&');
   switch(rec[0])
   {
    case "0": //刷新
     if(rec[3]==MachineIP)
     {
      if(box.FindString(rec[1]+" "+rec[2])<=0)
           box.Items.Add(rec[1]+" "+rec[2]);
     }
     else if(rec[1]==rec[3])
     {
      //從其他機器發送過來的刷新請求
      //返回自己的信息
      string sendstr="0&"+machineIP+"&"+MachineName+"&"+rec[3];
      this.SendPack(sendstr);
      //如果不存在則添加該用戶
      if(box.FindString(rec[1]+" "+rec[2])<=0)
       box.Items.Add(rec[1]+" "+rec[2]);
     }
     break;
    case "1": //發言
     if(rec[3]==MachineIP)
     {
      romeName=rec[2];
      romeIP=rec[1];
      romeCon=rec[4];
      showNe();
     }
     break;
    case "2": //傳文件
     break;
    case "9": //確認包
     if(rec[3]==MachineIP)
      MessageBox.Show("信息來自：rec[2]("+rec[1]+")\r\n"+rec[4],"消息");
     break;
   }

}

//發送數據包到廣播地址
public void SendPack(string sendStr)
{

   byte[] sendb=Encoding.Default.GetBytes(sendStr);
   try
   {
    listen.Send(sendb,sendb.Length,End);
   }
   catch(Exception e)
   {
    MessageBox.Show(e.Message.ToString());
   }
}

//刷新
private void button3_Click(object sender, System.EventArgs e)
{
   box.Items.Clear();
   box.Items.Add("IP            主機名");
   string temp2="0&"+machineIP+"&"+machineName+"&"+MachineIP;
   this.SendPack(temp2);
}

//關閉循環
private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
   runing=false;
   UdpClient mm=new UdpClIEnt();
   IPEndPoint tempIPEnd=new IPEndPoint(IPAddress.Parse("127.0.0.1"),2525);
   string temps="0&0&0&0&0";
   byte[] sendb=Encoding.Default.GetBytes(temps);
   mm.Send(sendb,sendb.Length,tempIPEnd);
}
//發送
private void button1_Click(object sender, System.EventArgs e)
{
   if(t_send.Text==null)
   {
    MessageBox.Show("不能發送空信息！");
    return;
   }
   if(box.SelectedItem==null||box.SelectedIndex==0)
   {
    MessageBox.Show("請先選擇一個用戶！");
    return;
   }
   string send="1&"+machineIP+"&"+MachineName+"&"+box.SelectedItem.ToString().Split(' ')[0]+"&"+t_send.Text;
   this.SendPack(send);
}
//清空
private void button2_Click(object sender, System.EventArgs e)
{
   t_send.Text=string.Empty;
   t_rec.Text=string.Empty;
}
//單擊顯示接收的信息並隱藏自身
private void newmsg_Click(object sender, System.EventArgs e)
{
   t_rec.Text="消息來自"+romeName+"("+romeIP+")"+DateTime.Now.ToShortDateString();
   t_rec.Text+="\r\n> "+romeCon;
   string back="9&"+machineIP+"&"+MachineName+"&"+romeIP+"&信息被打開！";
   this.SendPack(back);
   newmsg.SendToBack();

}
//當有信息時顯示提示按鈕
public void showNe()
{
   //窗體顯示
   if(this.WindowState!=FormWindowstate.Normal)
   {
    this.Visible=true;
    this.WindowState=FormWindowstate.Normal;
   }
   newmsg.BringToFront();
}
}
}