目录
预备知识
视频教程
项目前准备知识点
1、服务器端程序的编写步骤
2、客户端程序编写步骤
代码部分
1、服务端FrmServer.cs文件
2、客户端FrmClient.cs文件
3、启动文件Program.cs
结果展示
预备知识
请查阅博客http://t.csdnimg.cn/jE4Tp
视频教程
链接:https://pan.baidu.com/s/13fkwlppoP9aYcXHiFEbKGQ?pwd=cvzn
提取码:cvzn
项目前准备知识点
1、服务器端程序的编写步骤
第一步:调用socket()函数创建一个用于通信的套接字。
第二步:给已经创建的套接字绑定一个端口号,这一般通过设置网络套接口地址和调用bind()函数来实现。
第三步:调用listen()函数使套接字成为一个监听套接字。
第四步:调用accept()函数来接受客户端的连接,这是就可以和客户端通信了。
第五步:处理客户端的连接请求第六步:终止连接。
2、客户端程序编写步骤
第一步:调用socket()函数创建一个用于通信的套接字。
第二步:通过设置套接字地址结构,说明客户端与之通信的服务器的IP地址和端口号。
第三步:调用connect()函数来建立与服务器的连接。
第四步:调用读写函数发送或者接收数据。
第五步:终止连接。
代码部分
1、服务端FrmServer.cs文件
FrmServer.cs窗体
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace SocketTCP
{
//声明委托
delegate void AddOnLineDelegate(string str, bool bl);
//声明委托
delegate void RecMsgDelegate(string str);
public partial class FrmTCPServer : Form
{
public FrmTCPServer()
{
InitializeComponent();
myAddOnline = AddOnline;
myRcvMsg = RecMsg;
myFileSave = FileSave;
}
//创建套接字
Socket sock = null;
//创建负责监听客户端连接的线程
Thread threadListen = null;
//创建URL与Socket的字典集合
Dictionary<string, Socket> DicSocket = new Dictionary<string, Socket>();
AddOnLineDelegate myAddOnline;
RecMsgDelegate myRcvMsg;
FileSaveDelegate myFileSave;
#region 开始监听
/// <summary>
/// 开始监听
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_StartServer_Click(object sender, EventArgs e)
{
//创建负责监听的套接字,注意其中参数:IPV4 字节流 TCP
sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPAddress address = IPAddress.Parse(this.txt_IP.Text.Trim());
//根据IPAddress以及端口号创建IPE对象
IPEndPoint endpoint = new IPEndPoint(address, int.Parse(this.txt_Port.Text.Trim()));
try
{
sock.Bind(endpoint);
Invoke(myRcvMsg, "服务器开启成功!");
MessageBox.Show("开启服务成功!", "打开服务");
}
catch (Exception ex)
{
MessageBox.Show("开启服务失败" + ex.Message, "打开服务");
return;
}
sock.Listen(10);
threadListen = new Thread(ListenConnecting);
threadListen.IsBackground = true;
threadListen.Start();
this.btn_StartServer.Enabled = false;
}
#endregion
#region 监听线程
/// <summary>
/// 监听线程
/// </summary>
private void ListenConnecting()
{
while (true)
{
//一旦监听到一个客户端的连接,将会创建一个与该客户端连接的套接字
Socket sockClient = sock.Accept();
string client = sockClient.RemoteEndPoint.ToString();
DicSocket.Add(client, sockClient);
Invoke(myAddOnline, client, true);
Invoke(myRcvMsg, client + "上线了!");
//开启接受线程
Thread thr = new Thread(ReceiveMsg);
thr.IsBackground = true;
thr.Start(sockClient);
}
}
#endregion
#region 接收线程
/// <summary>
/// 接收线程
/// </summary>
/// <param name="sockClient"></param>
private void ReceiveMsg(object sockClient)
{
Socket sckclient = sockClient as Socket;
while (true)
{
//定义一个2M缓冲区
byte[] arrMsgRec = new byte[1024 * 1024 * 2];
int length = -1;
try
{
length = sckclient.Receive(arrMsgRec);
}
catch (Exception)
{
string str = sckclient.RemoteEndPoint.ToString();
Invoke(myRcvMsg, str + "下线了!");
//从列表中移除URL
Invoke(myAddOnline, str, false);
DicSocket.Remove(str);
break;
}
if (length == 0)
{
string str = sckclient.RemoteEndPoint.ToString();
Invoke(myRcvMsg, str + "下线了!");
//从列表中移除URL
Invoke(myAddOnline, str, false);
DicSocket.Remove(str);
break;
}
else
{
if (arrMsgRec[0] == 0)
{
string strMsg = Encoding.UTF8.GetString(arrMsgRec, 1, length-1);
string Msg = "[接收] " + sckclient.RemoteEndPoint.ToString() + " " + strMsg;
Invoke(myRcvMsg, Msg);
}
if (arrMsgRec[0] == 1)
{
Invoke(myFileSave, arrMsgRec,length);
}
}
}
}
#endregion
#region 委托方法体
private void AddOnline(string url, bool bl)
{
if (bl)
{
this.lbOnline.Items.Add(url);
}
else
{
this.lbOnline.Items.Remove(url);
}
}
private void RecMsg(string str)
{
this.txt_Rcv.AppendText(str + Environment.NewLine);
}
private void FileSave(byte[] bt, int length)
{
try
{
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "word files(*.docx)|*.docx|txt files(*.txt)|*.txt|xls files(*.xls)|*.xls|All files(*.*)|*.*";
if (sfd.ShowDialog() == DialogResult.OK)
{
string fileSavePath = sfd.FileName;
using (FileStream fs = new FileStream(fileSavePath, FileMode.Create))
{
fs.Write(bt, 1, length - 1);
Invoke(new Action(() => this.txt_Rcv.AppendText("[保存] 保存文件成功" + fileSavePath + Environment.NewLine)));
}
}
}
catch (Exception ex)
{
MessageBox.Show("保存异常" + ex.Message, "保存文件出现异常");
}
}
#endregion
#region 发送消息
/// <summary>
/// 发送消息
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_SendToSingle_Click(object sender, EventArgs e)
{
string StrMsg = this.txt_Send.Text.Trim();
byte[] arrMsg = Encoding.UTF8.GetBytes(StrMsg);
byte[] arrSend = new byte[arrMsg.Length + 1];
arrSend[0] = 0;
Buffer.BlockCopy(arrMsg, 0, arrSend, 1, arrMsg.Length);
if (this.lbOnline.SelectedItems.Count == 0)
{
MessageBox.Show("请选择你要发送的对象!", "发送提示");
return;
}
else
{
foreach (string item in this.lbOnline.SelectedItems)
{
DicSocket[item].Send(arrSend);
string Msg = "[发送] " + item + " " + StrMsg;
Invoke(myRcvMsg, Msg);
}
}
}
#endregion
#region 群发消息
/// <summary>
/// 群发消息
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_SendToAll_Click(object sender, EventArgs e)
{
string StrMsg = this.txt_Send.Text.Trim();
byte[] arrMsg = Encoding.UTF8.GetBytes(StrMsg);
byte[] arrSend = new byte[arrMsg.Length + 1];
arrSend[0] = 0;
Buffer.BlockCopy(arrMsg, 0, arrSend, 1, arrMsg.Length);
foreach (string item in this.DicSocket.Keys)
{
DicSocket[item].Send(arrSend);
string Msg = "[发送] " + item + " " + StrMsg;
Invoke(myRcvMsg, Msg);
}
Invoke(myRcvMsg, "[群发] 群发完毕!");
}
#endregion
#region 打开客户端
/// <summary>
/// 打开客户端
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_Client_Click(object sender, EventArgs e)
{
FrmTCPClient objFrm = new FrmTCPClient();
objFrm.Show();
}
#endregion
#region 选择文件
/// <summary>
/// 选择文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_SelectFile_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.InitialDirectory = "D:\\";
if (ofd.ShowDialog() == DialogResult.OK)
{
this.txt_SelectFile.Text = ofd.FileName;
}
}
#endregion
#region 发送文件
/// <summary>
/// 发送文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_SendFile_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(txt_SelectFile.Text))
{
MessageBox.Show("请选择您要发送的文件!", "发送文件提示");
return;
}
string online = this.lbOnline.Text.Trim();
if (string.IsNullOrEmpty(online))
{
MessageBox.Show("请选择您要发送的对象!", "发送文件提示");
return;
}
using (FileStream fs = new FileStream(txt_SelectFile.Text, FileMode.Open))
{
string filename = Path.GetFileName(txt_SelectFile.Text);
string StrMsg = "发送文件为:" + filename;
byte[] arrMsg = Encoding.UTF8.GetBytes(StrMsg);
byte[] arrSend= new byte[arrMsg.Length + 1];
arrSend[0] =0;
Buffer.BlockCopy(arrMsg, 0, arrSend, 1, arrMsg.Length);
DicSocket[online].Send(arrSend);
byte[] arrfileSend = new byte[1024 * 1024 * 2];
int length = fs.Read(arrfileSend, 0, arrfileSend.Length);
byte[] arrfile = new byte[length + 1];
arrfile[0] = 1;
Buffer.BlockCopy(arrfileSend, 0, arrfile, 1, length);
DicSocket[online].Send(arrfile);
}
}
#endregion
}
}
2、客户端FrmClient.cs文件
FrmClient.cs窗体
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace SocketTCP
{
delegate void FileSaveDelegate(byte[] bt,int length);
public partial class FrmTCPClient : Form
{
public FrmTCPClient()
{
InitializeComponent();
MyFileSave = FileSave;
}
//Socket对象
Socket sockClient = null;
//接收线程
Thread thrClient = null;
//运行标志位
private bool IsRunning = true;
//文件保存委托对象
FileSaveDelegate MyFileSave;
#region 连接服务器
/// <summary>
/// 连接服务器
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_Connect_Click(object sender, EventArgs e)
{
IPAddress address = IPAddress.Parse(this.txt_IP.Text.Trim());
IPEndPoint Ipe = new IPEndPoint(address, int.Parse(this.txt_Port.Text.Trim()));
sockClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
this.txt_Rcv.AppendText("与服务器连接中......" + Environment.NewLine);
sockClient.Connect(Ipe);
}
catch (Exception ex)
{
MessageBox.Show("连接失败" + ex.Message, "建立连接");
return;
}
this.txt_Rcv.AppendText("与服务器连接成功" + Environment.NewLine);
this.btn_Connect.Enabled = false;
thrClient = new Thread(ReceiceMsg);
thrClient.IsBackground = true;
thrClient.Start();
}
#endregion
#region 接收消息
/// <summary>
/// 接收消息
/// </summary>
private void ReceiceMsg()
{
while (IsRunning)
{
//定义一个2M缓冲区
byte[] arrMsgRec = new byte[1024 * 1024 * 2];
int length = -1;
try
{
length = sockClient.Receive(arrMsgRec);
}
catch (SocketException)
{
break;
}
catch (Exception ex)
{
Invoke(new Action(() => this.txt_Rcv.AppendText("断开连接" + ex.Message + Environment.NewLine)));
break;
}
if (length > 0)
{
//表示接受到的为消息类型
if (arrMsgRec[0] == 0)
{
string strMsg = Encoding.UTF8.GetString(arrMsgRec, 1, length-1);
string Msg = "[接收] " + strMsg + Environment.NewLine;
Invoke(new Action(() => this.txt_Rcv.AppendText(Msg)));
}
//表示接收到的为文件类型
if (arrMsgRec[0] == 1)
{
Invoke(MyFileSave, arrMsgRec,length);
}
}
}
}
#endregion
#region 委托方法体
private void FileSave(byte[] bt, int length)
{
try
{
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "word files(*.docx)|*.docx|txt files(*.txt)|*.txt|xls files(*.xls)|*.xls|All files(*.*)|*.*";
if (sfd.ShowDialog() == DialogResult.OK)
{
string fileSavePath = sfd.FileName;
using (FileStream fs = new FileStream(fileSavePath, FileMode.Create))
{
fs.Write(bt, 1, length - 1);
Invoke(new Action(() => this.txt_Rcv.AppendText("[保存] 保存文件成功" + fileSavePath+Environment.NewLine)));
}
}
}
catch (Exception ex)
{
MessageBox.Show("保存异常" + ex.Message, "保存文件出现异常");
}
}
#endregion
#region 发送消息
/// <summary>
/// 发送消息
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_Send_Click(object sender, EventArgs e)
{
string strMsg = "来自" + this.txt_Name.Text.Trim() + ": " + this.txt_Send.Text.Trim();
byte[] arrMsg = Encoding.UTF8.GetBytes(strMsg);
byte[] arrSend = new byte[arrMsg.Length + 1];
arrSend[0] = 0;
Buffer.BlockCopy(arrMsg, 0, arrSend, 1, arrMsg.Length);
sockClient.Send(arrSend);
Invoke(new Action(() => this.txt_Rcv.AppendText("[发送] " + this.txt_Send.Text.Trim() + Environment.NewLine)));
}
#endregion
#region 窗体关闭事件
/// <summary>
/// 窗体关闭事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FrmTCPClient_FormClosing(object sender, FormClosingEventArgs e)
{
IsRunning = false;
sockClient?.Close();
}
#endregion
#region 选择文件
/// <summary>
/// 选择文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_SelectFile_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.InitialDirectory = "D:\\";
if (ofd.ShowDialog() == DialogResult.OK)
{
this.txt_SelectFile.Text = ofd.FileName;
}
}
#endregion
#region 发送文件
/// <summary>
/// 发送文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_SendFile_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(txt_SelectFile.Text))
{
MessageBox.Show("请选择您要发送的文件!", "发送文件提示");
return;
}
using (FileStream fs = new FileStream(txt_SelectFile.Text, FileMode.Open))
{
string filename = Path.GetFileName(txt_SelectFile.Text);
string StrMsg = "发送文件为:" + filename;
byte[] arrMsg = Encoding.UTF8.GetBytes(StrMsg);
byte[] arrSend = new byte[arrMsg.Length + 1];
arrSend[0] = 0;
Buffer.BlockCopy(arrMsg, 0, arrSend, 1, arrMsg.Length);
sockClient.Send(arrSend);
byte[] arrfileSend = new byte[1024 * 1024 * 2];
int length = fs.Read(arrfileSend, 0, arrfileSend.Length);
byte[] arrfile = new byte[length + 1];
arrfile[0] = 1;
Buffer.BlockCopy(arrfileSend, 0, arrfile, 1, length);
sockClient.Send(arrfile);
}
}
#endregion
}
}
3、启动文件Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace SocketTCP
{
static class Program
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new FrmTCPServer());
}
}
}