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 .gif)
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:[email protected]"; // // 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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