异步通信实例（二）Client

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 TCLient
...{
    /**//// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    ...{
        private System.Windows.Forms.TextBox txt;
        private System.Windows.Forms.StatusBar statBar;
        private System.Windows.Forms.TextBox txtIP;
        private System.Windows.Forms.TextBox sendText;
        private System.Windows.Forms.Button btnSend;
        private System.Windows.Forms.Button btnStart;
        private System.Net.Sockets.Socket client;
        private byte[] buffer;
        /**//// <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 );
        }

        Windows 窗体设计器生成的代码#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.txt = new System.Windows.Forms.TextBox();
            this.statBar = new System.Windows.Forms.StatusBar();
            this.txtIP = new System.Windows.Forms.TextBox();
            this.sendText = new System.Windows.Forms.TextBox();
            this.btnSend = new System.Windows.Forms.Button();
            this.btnStart = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // txt
            // 
            this.txt.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
                | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right)));
            this.txt.Location = new System.Drawing.Point(0, 32);
            this.txt.Multiline = true;
            this.txt.Name = "txt";
            this.txt.Size = new System.Drawing.Size(584, 208);
            this.txt.TabIndex = 0;
            this.txt.Text = "";
            // 
            // statBar
            // 
            this.statBar.Location = new System.Drawing.Point(0, 244);
            this.statBar.Name = "statBar";
            this.statBar.Size = new System.Drawing.Size(584, 22);
            this.statBar.TabIndex = 1;
            // 
            // txtIP
            // 
            this.txtIP.Location = new System.Drawing.Point(8, 8);
            this.txtIP.Name = "txtIP";
            this.txtIP.Size = new System.Drawing.Size(96, 21);
            this.txtIP.TabIndex = 2;
            this.txtIP.Text = "192.168.0.14";
            // 
            // sendText
            // 
            this.sendText.Location = new System.Drawing.Point(104, 8);
            this.sendText.Name = "sendText";
            this.sendText.Size = new System.Drawing.Size(272, 21);
            this.sendText.TabIndex = 3;
            this.sendText.Text = "";
            // 
            // btnSend
            // 
            this.btnSend.Location = new System.Drawing.Point(392, 8);
            this.btnSend.Name = "btnSend";
            this.btnSend.TabIndex = 4;
            this.btnSend.Text = "发送";
            this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
            // 
            // btnStart
            // 
            this.btnStart.Location = new System.Drawing.Point(488, 8);
            this.btnStart.Name = "btnStart";
            this.btnStart.TabIndex = 4;
            this.btnStart.Text = "开始";
            this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(584, 266);
            this.Controls.Add(this.btnSend);
            this.Controls.Add(this.sendText);
            this.Controls.Add(this.txtIP);
            this.Controls.Add(this.statBar);
            this.Controls.Add(this.txt);
            this.Controls.Add(this.btnStart);
            this.Name = "Form1";
            this.Text = "客户端";
            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 Form1());
        }

        private void Form1_Load(object sender, System.EventArgs e)
        ...{
            this.client = new Socket( AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp );
            this.statBar.Text = "初始化完毕...";
            this.buffer = new byte[ 1024 ];
        }

        private void btnStart_Click(object sender, System.EventArgs e)
        ...{
            IPEndPoint ipep = new IPEndPoint( IPAddress.Parse( this.txtIP.Text ),9000 );
            this.client.BeginConnect( (EndPoint)ipep,new AsyncCallback(this.ConnectCallback ),this.client );
        }

        private void ConnectCallback( System.IAsyncResult iar )
        ...{
            try
            ...{
                Socket server = (Socket)iar.AsyncState;
                this.client.EndConnect( iar );
                this.txt.Text += " 已连接至服务器。";
                this.statBar.Text = "连接到服务器:" + server.RemoteEndPoint.ToString();
                this.client.BeginReceive( this.buffer,0,this.buffer.Length,SocketFlags.None,new AsyncCallback( this.ReceiveCallback ),this.client );        

            }
            catch( Exception ex )
            ...{
                this.txt.Text += " " + ex.ToString();
            }
        }

        private void ReceiveCallback( System.IAsyncResult iar )
        ...{
            try
            ...{
                Socket remote = (Socket)iar.AsyncState;
                int recv = remote.EndReceive( iar );
                string tmp = System.Text.Encoding.Default.GetString( this.buffer,0,recv );
                this.txt.Text += " 从服务器端接收到:" + tmp;
            }
            catch( Exception ex )
            ...{
            }
        }

        private void Send()
        ...{
            byte[] tmp = System.Text.Encoding.Default.GetBytes( this.sendText.Text );
            this.client.BeginSend( tmp,0,tmp.Length,SocketFlags.None,new AsyncCallback(this.SendCallback),this.client );
        }

        private void SendCallback( System.IAsyncResult iar )
        ...{
            try
            ...{
                Socket remote = (Socket)iar.AsyncState;
                int s = remote.EndSend( iar );
                remote.BeginReceive( this.buffer,0,this.buffer.Length,SocketFlags.None,new AsyncCallback(this.ReceiveCallback),remote );
            }
            catch( Exception ex )
            ...{
                this.txt.Text += " " + ex.ToString();
            }
        }

        private void btnSend_Click(object sender, System.EventArgs e)
        ...{
            this.Send();
        }
    }
}