用Socket异步调用实现的一个TCP的网络信息对话

偶然一天没事干、空虚、无聊、发呆......，总的要给自己找点事情做啊，想来想去，决定用C#做一个pop3、smtp的邮件发送和接收组件，但是又不熟悉pop3、smtp协议，网上狂找一通，有了一点点眉目，但是又没办法试一下这些命令，总不能瞎来吧，怎搞？

咦，干嘛不作一个网络信息发送和察看接收到的信息的小工具呢？这样不但可以试试pop3、smtp协议的东西，还可以试试ftp、http......说干就干，反正也没事干

正好那天看了一个什么异步的东西，在msdn上随便看了看，知道了一个大概，那就开搞吧（偶长期半懂不懂的就开搞了，等实在搞不动的时候再查资料）

结果就搞出来下面一个被偶称为“TCP Net Dialog”的小工具。

http示例

FTP示例

POP3示例

SMTP示例

源代码如下

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;

namespace NetConnect

{

/// <summary>

/// Form1 的摘要说明。

/// </summary>

public class Form1 : System.Windows.Forms.Form

{

private System.Windows.Forms.TextBox IPTextBox;

private System.Windows.Forms.TextBox PortTextBox;

private System.Windows.Forms.Button ConnectButton;

private System.Windows.Forms.TextBox InputBox;

private System.Windows.Forms.Label label1;

private System.Windows.Forms.Label label2;

private System.Windows.Forms.Label label3;

private System.Windows.Forms.Button SendButton;

private System.Windows.Forms.RichTextBox ResultTextBox;

private System.Windows.Forms.Button button1;

private System.Windows.Forms.Button ExitButton;

private System.Windows.Forms.StatusBar statusBar1;

private System.Windows.Forms.Button DisconnectButton;

Socket MySocket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

string Line='\r\n';//换行符，同时也是网络数据的结束标志

static int RecvLength=1024*10;//每次接受的字节数

byte[] RecvBF=new byte[RecvLength];

string NullString=System.Text.UTF8Encoding.UTF8.GetString(new byte[RecvLength]);

/// <summary>

/// 必需的设计器变量。

/// </summary>

private System.ComponentModel.Container components = null;

public Form1()

{

//

// 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 Form Designer generated code

/// <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.IPTextBox = new System.Windows.Forms.TextBox();

this.PortTextBox = new System.Windows.Forms.TextBox();

this.ConnectButton = new System.Windows.Forms.Button();

this.InputBox = new System.Windows.Forms.TextBox();

this.SendButton = new System.Windows.Forms.Button();

this.label1 = new System.Windows.Forms.Label();

this.label2 = new System.Windows.Forms.Label();

this.label3 = new System.Windows.Forms.Label();

this.DisconnectButton = new System.Windows.Forms.Button();

this.ResultTextBox = new System.Windows.Forms.RichTextBox();

this.button1 = new System.Windows.Forms.Button();

this.ExitButton = new System.Windows.Forms.Button();

this.statusBar1 = new System.Windows.Forms.StatusBar();

this.SuspendLayout();

//

// IPTextBox

//

this.IPTextBox.Location = new System.Drawing.Point(40, 8);

this.IPTextBox.Name = 'IPTextBox';

this.IPTextBox.TabIndex = 0;

this.IPTextBox.Text = '192.168.72.193';

//

// PortTextBox

//

this.PortTextBox.Location = new System.Drawing.Point(176, 8);

this.PortTextBox.Name = 'PortTextBox';

this.PortTextBox.Size = new System.Drawing.Size(32, 21);

this.PortTextBox.TabIndex = 1;

this.PortTextBox.Text = '80';

//

// ConnectButton

//

this.ConnectButton.Anchor = (System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right);

this.ConnectButton.Location = new System.Drawing.Point(224, 8);

this.ConnectButton.Name = 'ConnectButton';

this.ConnectButton.TabIndex = 2;

this.ConnectButton.Text = 'Connect';

this.ConnectButton.Click += new System.EventHandler(this.ConnectButton_Click);

//

// InputBox

//

this.InputBox.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)

| System.Windows.Forms.AnchorStyles.Right);

this.InputBox.Location = new System.Drawing.Point(64, 40);

this.InputBox.Multiline = true;

this.InputBox.Name = 'InputBox';

this.InputBox.Size = new System.Drawing.Size(232, 104);

this.InputBox.TabIndex = 3;

this.InputBox.Text = '';

this.InputBox.KeyUp += new System.Windows.Forms.KeyEventHandler(this.InputBox_KeyUp);

//

// SendButton

//

this.SendButton.Anchor = (System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right);

this.SendButton.Location = new System.Drawing.Point(312, 48);

this.SendButton.Name = 'SendButton';

this.SendButton.TabIndex = 4;

this.SendButton.Text = 'Send';

this.SendButton.Click += new System.EventHandler(this.SendButton_Click);

//

// label1

//

this.label1.Location = new System.Drawing.Point(8, 8);

this.label1.Name = 'label1';

this.label1.Size = new System.Drawing.Size(32, 23);

this.label1.TabIndex = 7;

this.label1.Text = 'IP';

//

// label2

//

this.label2.Location = new System.Drawing.Point(144, 8);

this.label2.Name = 'label2';

this.label2.Size = new System.Drawing.Size(32, 23);

this.label2.TabIndex = 8;

this.label2.Text = 'Port';

//

// label3

//

this.label3.Location = new System.Drawing.Point(8, 40);

this.label3.Name = 'label3';

this.label3.Size = new System.Drawing.Size(48, 23);

this.label3.TabIndex = 9;

this.label3.Text = 'Message';

//

// DisconnectButton

//

this.DisconnectButton.Anchor = (System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right);

this.DisconnectButton.Location = new System.Drawing.Point(312, 8);

this.DisconnectButton.Name = 'DisconnectButton';

this.DisconnectButton.TabIndex = 10;

this.DisconnectButton.Text = 'Disconnect';

this.DisconnectButton.Click += new System.EventHandler(this.DisconnectButton_Click);

//

// ResultTextBox

//

this.ResultTextBox.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)

| System.Windows.Forms.AnchorStyles.Left)

| System.Windows.Forms.AnchorStyles.Right);

this.ResultTextBox.Location = new System.Drawing.Point(8, 160);

this.ResultTextBox.Name = 'ResultTextBox';

this.ResultTextBox.ReadOnly = true;

this.ResultTextBox.Size = new System.Drawing.Size(384, 312);

this.ResultTextBox.TabIndex = 11;

this.ResultTextBox.Text = '';

this.ResultTextBox.WordWrap = false;

//

// button1

//

this.button1.Anchor = (System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right);

this.button1.Location = new System.Drawing.Point(312, 80);

this.button1.Name = 'button1';

this.button1.TabIndex = 12;

this.button1.Text = 'Clear';

this.button1.Click += new System.EventHandler(this.button1_Click);

//

// ExitButton

//

this.ExitButton.Anchor = (System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right);

this.ExitButton.Location = new System.Drawing.Point(312, 112);

this.ExitButton.Name = 'ExitButton';

this.ExitButton.TabIndex = 13;

this.ExitButton.Text = 'Exit';

this.ExitButton.Click += new System.EventHandler(this.ExitButton_Click);

//

// statusBar1

//

this.statusBar1.Location = new System.Drawing.Point(0, 477);

this.statusBar1.Name = 'statusBar1';

this.statusBar1.Size = new System.Drawing.Size(400, 16);

this.statusBar1.TabIndex = 14;

this.statusBar1.Text = 'Programed by xuexplorer mail:xuexplorer@163.com';

//

// Form1

//

this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

this.ClientSize = new System.Drawing.Size(400, 493);

this.Controls.AddRange(new System.Windows.Forms.Control[] {

this.statusBar1,

this.ExitButton,

this.button1,

this.ResultTextBox,

this.DisconnectButton,

this.label3,

this.label2,

this.label1,

this.SendButton,

this.InputBox,

this.ConnectButton,

this.PortTextBox,

this.IPTextBox});

this.Name = 'Form1';

this.Text = 'TCP Net Dialog';

this.ResumeLayout(false);

}

#endregion

/// <summary>

/// 应用程序的主入口点。

/// </summary>

[STAThread]

static void Main()

{

Application.Run(new Form1());

}

/// <summary>

/// 连接

/// </summary>

/// <param name='sender'></param>

/// <param name='e'></param>

private void ConnectButton_Click(object sender, System.EventArgs e)

{

try

{

if(MySocket.Connected)

return;

IPAddress ip=IPAddress.Parse(IPTextBox.Text);

int port=int.Parse(PortTextBox.Text);

IPEndPoint ipEP=new IPEndPoint(ip,port);

MySocket.Connect((EndPoint)ipEP);

if(MySocket.Connected)

{

this.ResultTextBox.Text+='Connect '+IPTextBox.Text+':'+PortTextBox.Text+' Successfully'+Line;

MySocket.BeginReceive(RecvBF,0,RecvBF.Length,0,new System.AsyncCallback(ReceiveMessage),MySocket);

}

}

catch(Exception ex)

{

this.ResultTextBox.Text+='Connect '+IPTextBox.Text+':'+PortTextBox.Text+' Unsuccessfully'+Line;

}

}

/// <summary>

/// 断开连接

/// </summary>

/// <param name='sender'></param>

/// <param name='e'></param>

private void DisconnectButton_Click(object sender, System.EventArgs e)

{

DisConnect();

}

/// <summary>

/// 断开连接

/// </summary>

private void DisConnect()

{

if(MySocket.Connected)

{

MySocket.Shutdown(SocketShutdown.Both);

MySocket.Close();

this.ResultTextBox.Text+=Line+'Connection Closed'+Line;

MySocket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

}

}

/// <summary>

/// 回调函数，接受信息

/// </summary>

/// <param name='result'></param>

private void ReceiveMessage(System.IAsyncResult result)

{

string str=System.Text.UTF8Encoding.Default.GetString(RecvBF);

RecvBF=new byte[RecvLength];

if(str!=NullString)

{

this.ResultTextBox.Text+='Recv:'+str+Line;

}

else

{

DisConnect();

}

if(MySocket.Connected)

{

MySocket.EndReceive(result);

MySocket.BeginReceive(RecvBF,0,RecvBF.Length,0,new System.AsyncCallback(ReceiveMessage),MySocket);

}

}

/// <summary>

/// 发送信息

/// </summary>

private void SendMessage()

{

if(!MySocket.Connected)

{

this.ResultTextBox.Text+='No Connection'+Line;

return;

}

string msg=this.InputBox.Text;

try

{

byte[] SendBF=new byte[1024];

SendBF=System.Text.UTF8Encoding.UTF8.GetBytes(msg);

MySocket.Send(SendBF);

this.ResultTextBox.Text+='Send:\''+this.InputBox.Text+'\' Successfully'+Line;

}

catch

{

this.ResultTextBox.Text+='Send:\''+this.InputBox.Text+'\' Unsuccessfully'+Line;

}

finally

{

this.InputBox.Clear();

}

}

/// <summary>

/// 发送信息

/// </summary>

/// <param name='sender'></param>

/// <param name='e'></param>

private void SendButton_Click(object sender, System.EventArgs e)

{

SendMessage();

}

/// <summary>

/// 清除结果

/// </summary>

/// <param name='sender'></param>

/// <param name='e'></param>

private void button1_Click(object sender, System.EventArgs e)

{

this.ResultTextBox.Clear();

}

/// <summary>

/// 退出

/// </summary>

/// <param name='sender'></param>

/// <param name='e'></param>

private void ExitButton_Click(object sender, System.EventArgs e)

{

DisConnect();

Dispose(true);

}

/// <summary>

/// 信息输入框中按Ctrl+Enter组合键

/// </summary>

/// <param name='sender'></param>

/// <param name='e'></param>

private void InputBox_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e)

{

if ((e.KeyData & Keys.Control) == Keys.Control && (e.KeyData & Keys.Enter) == Keys.Enter)

{

int i=InputBox.Text.LastIndexOf(Line);

this.InputBox.Text=this.InputBox.Text.Substring(0,InputBox.Text.LastIndexOf('\r\n'));

SendMessage();

}

}

}

}

也没啥详细的说明，因为我也是半懂不懂，怕说错了误导了初学者，异步调用相关内容请到msdn中查询“异步调用”。

作这个东西只是为了好玩，消磨时间而已。

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