C# Builder 实现POP3信箱的监视

技术2022-05-11 120

作者：徐长友( http://yousoft.hi.com.cn )摘要：Borland的C# Builder是一个基于C#语言的编程工具，C# Builder允许开发者用Java或CORBA工具开发，C# Builder同时也具有从多种数据库中读取数据的能力，可以混合和适应不同开发标准的能力。本文向大家介绍怎样用Borland C# Builder编写一个信箱监视程序，程序主要是通过WinSock来进行网络通信。要实现这个程序，应对POP3协议有一定的了解，下面是对POP3协议的一个粗略的介绍，读者可以参看RFC 1225更为详细地了解该协议。一、POP3协议简单介绍　　POP3服务器程序通常在TCP端口110提供服务。当客户想要使用服务时，它便与服务器建立一个TCP连接。一旦连接建立，POP3服务器就向客户发送一条欢迎消息。然后客户开始给服务器发送命令，服务器则给出相应的回答。POP3的命令由一个关键词或者关键词加参数组成。每个命令以回车换行（0xD0xA）作为结束标志。对于所有的命令，POP3服务器都会提供一个回答。服务器的回答由一个状态标志加一些附加信息组成。目前使用的两个标志是“＋OK”和“－ERR”，分别表示客户的命令是否合法。所有的回答也是以回车换行结束。与本文讨论的话题相关的四个POP3命令是USER、PASS、STAT和QUIT。 USER命令格式USER name 　　其中name是用户在该POP3服务器上的用户标识。客户应该在接到服务器的欢迎消息后或者在上一个USER或者PASS失败之后可以发送此命令。 PASS命令格式PASS string 　　其中string为该用户的密码。客户在发送了USER命令并且收到了＋OK的回答之后方可发送此命令。如果用户名和密码都正确，服务器回答＋OK，否则－ERR。 STAT命令格式STAT STAT命令来查看邮箱的情况。STAT命令的回应中有两个数字，分别表示邮件的数量和邮件的大小。QUIT命令　　从POP3服务器上退出登录。二、POP3信箱的监视程序分析我们准备的做的程序要实现以下功能： 1.托盘图标，程序一运行，只显示一托盘图标，右键点击托盘图标可弹出菜单。 2.获取邮件数量，根据POP3协议，得到邮件的数量。 3.读取和写注册表，注册表中保存服务器、用户名、密码等设置。 4.用户提示信息，这里我们做一个与MSN一样的提示窗口。三、程序实现下面我们就不妨着手我们的程序。首先，打开Borland C# builder，新建一个项目，菜单 File->C# Applicaion 项目的名称不妨设为"chkpop3"，图示如下： [ 相关贴图 ] 设计主窗口，如下图： [ 相关贴图 ] 主要包括五个文本框，五个标签，三个按钮，一个选择框和一个timer。WinForm设置如下：text:收取邮件startPosition:CenterScreenMaximizeBox:false三个按钮:最小化按钮：最小化窗口，这里就是隐藏主窗口。取邮件按钮：实现取得POP3信箱中的邮件数量，并用信息窗口提示。应用按钮：保存设置到注册表中timer1的功能：完成在一定时间间隔内取POP3信箱中邮件数量。1.托盘的实现：从tool palette选择组件contextMenu(加两个菜单项，设置和退出)、notifyIcon(text设为：邮箱检测，图标ICON选择一个16x16的小图标即可，contextMenu设为前面加入的contextMenu1，Visible设为true) 这样一个完整的托盘程序就设好了。2.用户提示信息的实现：新建一窗口WinForm1，把窗体的FormBorderStyle属性设置为None（无边框模式），然后把TopMost属性（总在最上方）属性设置为True，把ShowInTaskbar属性(是否在 Windows 任务栏中显示窗体)设置为False，并在窗体上加上一文字标签，将窗体的背景设置为你想要的图片和合适的大小。最后再放上三个Timer控件，其中，timer1控制窗体滚出的动画，timer2控制窗体停留时间，timer3控制窗体的滚入动画，将它们的Interval属性设置为10，如图： [ 相关贴图 ] WinForm1代码如下：using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;namespace pop3{ /// <summary> /// Summary description for WinForm1. /// </summary> public class WinForm1 : System.Windows.Forms.Form { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.IContainer components; private System.Windows.Forms.Timer timer1; private System.Windows.Forms.Timer timer2; private System.Windows.Forms.Timer timer3; private System.Windows.Forms.LinkLabel linkLabel1; public string str_num; public WinForm1() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose (bool disposing) { if (disposing) { if (components != null) { components.Dispose(); } } base.Dispose(disposing); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.components = new System.ComponentModel.Container(); System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(WinForm1)); this.timer1 = new System.Windows.Forms.Timer(this.components); this.timer2 = new System.Windows.Forms.Timer(this.components); this.timer3 = new System.Windows.Forms.Timer(this.components); this.linkLabel1 = new System.Windows.Forms.LinkLabel(); this.SuspendLayout(); // // timer1 // this.timer1.Interval = 10; this.timer1.Tick += new System.EventHandler(this.timer1_Tick); // // timer2 // this.timer2.Interval = 10; this.timer2.Tick += new System.EventHandler(this.timer2_Tick); // // timer3 // this.timer3.Interval = 10; this.timer3.Tick += new System.EventHandler(this.timer3_Tick); // // linkLabel1 // this.linkLabel1.AutoSize = true; this.linkLabel1.BackColor = System.Drawing.Color.WhiteSmoke; this.linkLabel1.Location = new System.Drawing.Point(56, 56); this.linkLabel1.Name = "linkLabel1"; this.linkLabel1.Size = new System.Drawing.Size(79, 17); this.linkLabel1.TabIndex = 0; this.linkLabel1.TabStop = true; this.linkLabel1.Text = "您有新邮件！"; // // WinForm1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.BackColor = System.Drawing.SystemColors.Info; this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage"))); this.ClientSize = new System.Drawing.Size(194, 122); this.Controls.Add(this.linkLabel1); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; this.Name = "WinForm1"; this.ShowInTaskbar = false; this.Text = "信息提示"; this.TopMost = true; this.Load += new System.EventHandler(this.WinForm1_Load); this.Activated += new System.EventHandler(this.WinForm1_Activated); this.ResumeLayout(false); } #endregion private void WinForm1_Load(object sender, System.EventArgs e) { Screen[] screens = Screen.AllScreens; Screen screen = screens[0]; this.Location = new Point(screen.WorkingArea.Width - 200, screen.WorkingArea.Height - 30); this.timer2.Interval = 5000; } private void ScrollUp() { if(Height < 122) { this.Height += 3; this.Location = new Point(this.Location.X, this.Location.Y - 3); } else { this.timer1.Enabled = false; this.timer2.Enabled = true; } } private void ScrollDown(){ if(Height > 3) { this.Height -= 3; this.Location = new Point(this.Location.X, this.Location.Y + 3); } else { this.timer3.Enabled = false; this.Close(); }} private void timer1_Tick(object sender, System.EventArgs e) { ScrollUp(); } private void timer2_Tick(object sender, System.EventArgs e) { timer2.Enabled = false; timer3.Enabled = true; } private void timer3_Tick(object sender, System.EventArgs e) { ScrollDown(); } public void ScrollShow() { this.Width = 194; this.Height = 0; this.Show(); this.timer1.Enabled = true; } private void WinForm1_Activated(object sender, System.EventArgs e) { linkLabel1.Text="您有"+str_num+"封新邮件！"; } }}具体的实现，可以参考一下网上的一篇文章：《用VC#编写仿MSN Messager的滚动提示窗口》，已经记不清出处了，可以通过这个网址 http://yousoft.hi.com.cn/article_view.asp?id=6595 浏览。3.获取邮件数量的实现，代码见下： string str_server; if ((tB_server.Text!="") && (tB_user.Text!="") && (tB_pwd.Text!="")) { TcpClient tcpc = new TcpClient(tB_server.Text,110); Byte[] outbytes; string input; NetworkStream ns = null; try{ ns = tcpc.GetStream(); StreamReader sr = new StreamReader(ns); tB_status.Text=sr.ReadLine(); input = "USER " + tB_user.Text + "/r/n"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) tB_status.Text=tB_status.Text+"/r/n"+sr.ReadLine(); input = "PASS " + tB_pwd.Text + "/r/n"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) tB_status.Text=tB_status.Text+"/r/n"+sr.ReadLine(); input = "STAT" + "/r/n"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) str_server=sr.ReadLine(); str_num=""; if (str_server.StartsWith("+OK")){ str_num=str_server.Split(' ')[1]; } else str_num=""; tB_status.Text=tB_status.Text+"/r/n"+"A:"+str_server; input = "QUIT" + "/r/n"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) tB_status.Text=tB_status.Text+"/r/n"+"B:"+sr.ReadLine(); } catch(InvalidOperationException ioe){ tB_status.Text="Could not connect to mail server"; } if (str_num!="") { WinForm1 form = new WinForm1(); form.str_num=str_num; form.ScrollShow(); }程序与邮件服务器建立一个TCP连接，然后发送POP3的一些命令，取到服务器传回的信息，得到邮件的数量。STAT命令的回应中有两个数字，分别表示邮件的数量和邮件的大小。一般格式是这样的“+OK 数量大小”所以，只要根据服务器返回的信息，提取+OK，然后再按空格分隔得到数量。代码见上。4.注册表的读写：我们知道，要实现程序在开机后自己运行，可以通过写注册表HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Run实现另外，为了方便用户，我们把邮件服务器，用户,密码等信息存入注册表，不用每次都再输一次。保存信息代码如下： RegistryKey rk; Registry.CurrentUser.CreateSubKey("Software//yousoft"); rk=Registry.CurrentUser.OpenSubKey("Software//yousoft",true); rk.Setvalue("server",tB_server.Text); rk.Setvalue("user",tB_user.Text); rk.Setvalue("pwd",tB_pwd.Text); rk.Setvalue("interval",tB_mins.Text); if (cB_autorun.Checked) { rk=Registry.CurrentUser.OpenSubKey("Software//Microsoft//Windows//CurrentVersion//Run",true); rk.Setvalue("chkmail",Application.ExecutablePath); } else { rk=Registry.CurrentUser.OpenSubKey("Software//Microsoft//Windows//CurrentVersion//Run",true); rk.Deletevalue("chkmail"); } rk.Close(); 启动程序时读入信息： private void WinForm_Load(object sender, System.EventArgs e) { RegistryKey rk; rk=Registry.CurrentUser.OpenSubKey("Software//yousoft",false); object srv=rk.Getvalue("server"); if (srv!=null) tB_server.Text=srv.ToString(); object usr=rk.Getvalue("user"); if (usr!=null) tB_user.Text=usr.ToString(); object pwd=rk.Getvalue("pwd"); if (pwd!=null) tB_pwd.Text=pwd.ToString(); object mins=rk.Getvalue("interval"); if (mins!=null) tB_mins.Text=mins.ToString(); rk.Close(); }WinForm的完整代码如下：using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Net.Sockets; using System.IO;using System.Net;using Microsoft.Win32;namespace pop3{ /// <summary> /// Summary description for WinForm. /// </summary> public class WinForm : System.Windows.Forms.Form { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.IContainer components; private System.Windows.Forms.Button button1; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.Label label3; private System.Windows.Forms.TextBox tB_server; private System.Windows.Forms.TextBox tB_user; private System.Windows.Forms.TextBox tB_pwd; private System.Windows.Forms.TextBox tB_status; private System.Windows.Forms.NotifyIcon notifyIcon1; private System.Windows.Forms.ContextMenu contextMenu1; private System.Windows.Forms.MenuItem menuItem1; private System.Windows.Forms.MenuItem menuItem2; private System.Windows.Forms.MenuItem menuItem3; private bool f_open=true; private string str_num=""; private System.Windows.Forms.Button button2; private System.Windows.Forms.Timer timer1; private System.Windows.Forms.TextBox tB_mins; private System.Windows.Forms.Label label4; private System.Windows.Forms.Label label5; private System.Windows.Forms.Button button3; private System.Windows.Forms.CheckBox cB_autorun; public WinForm() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose (bool disposing) { if (disposing) { if (components != null) { components.Dispose(); } } base.Dispose(disposing); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.components = new System.ComponentModel.Container(); System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(WinForm)); this.button1 = 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.tB_server = new System.Windows.Forms.TextBox(); this.tB_user = new System.Windows.Forms.TextBox(); this.tB_pwd = new System.Windows.Forms.TextBox(); this.tB_status = new System.Windows.Forms.TextBox(); this.notifyIcon1 = new System.Windows.Forms.NotifyIcon(this.components); this.contextMenu1 = new System.Windows.Forms.ContextMenu(); this.menuItem1 = new System.Windows.Forms.MenuItem(); this.menuItem2 = new System.Windows.Forms.MenuItem(); this.menuItem3 = new System.Windows.Forms.MenuItem(); this.button2 = new System.Windows.Forms.Button(); this.timer1 = new System.Windows.Forms.Timer(this.components); this.tB_mins = new System.Windows.Forms.TextBox(); this.label4 = new System.Windows.Forms.Label(); this.label5 = new System.Windows.Forms.Label(); this.button3 = new System.Windows.Forms.Button(); this.cB_autorun = new System.Windows.Forms.CheckBox(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(152, 176); this.button1.Name = "button1"; this.button1.TabIndex = 0; this.button1.Text = "取邮件"; this.button1.Click += new System.EventHandler(this.button1_Click); // // label1 // this.label1.Location = new System.Drawing.Point(24, 32); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(80, 23); this.label1.TabIndex = 1; this.label1.Text = "邮件服务器："; // // label2 // this.label2.Location = new System.Drawing.Point(48, 64); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(56, 23); this.label2.TabIndex = 2; this.label2.Text = "用户名："; // // label3 // this.label3.Location = new System.Drawing.Point(58, 96); this.label3.Name = "label3"; this.label3.Size = new System.Drawing.Size(48, 23); this.label3.TabIndex = 3; this.label3.Text = "密码："; // // tB_server // this.tB_server.Location = new System.Drawing.Point(112, 24); this.tB_server.Name = "tB_server"; this.tB_server.Size = new System.Drawing.Size(176, 21); this.tB_server.TabIndex = 4; this.tB_server.Text = ""; this.tB_server.TextChanged += new System.EventHandler(this.tB_pwd_TextChanged); // // tB_user // this.tB_user.Location = new System.Drawing.Point(112, 60); this.tB_user.Name = "tB_user"; this.tB_user.Size = new System.Drawing.Size(176, 21); this.tB_user.TabIndex = 5; this.tB_user.Text = ""; this.tB_user.TextChanged += new System.EventHandler(this.tB_pwd_TextChanged); // // tB_pwd // this.tB_pwd.Location = new System.Drawing.Point(112, 91); this.tB_pwd.Name = "tB_pwd"; this.tB_pwd.PasswordChar = '*'; this.tB_pwd.Size = new System.Drawing.Size(176, 21); this.tB_pwd.TabIndex = 6; this.tB_pwd.Text = ""; this.tB_pwd.TextChanged += new System.EventHandler(this.tB_pwd_TextChanged); // // tB_status // this.tB_status.Location = new System.Drawing.Point(16, 208); this.tB_status.Multiline = true; this.tB_status.Name = "tB_status"; this.tB_status.Size = new System.Drawing.Size(328, 80); this.tB_status.TabIndex = 7; this.tB_status.Text = ""; // // notifyIcon1 // this.notifyIcon1.ContextMenu = this.contextMenu1; this.notifyIcon1.Icon = ((System.Drawing.Icon)(resources.GetObject("notifyIcon1.Icon"))); this.notifyIcon1.Text = "邮件检测"; this.notifyIcon1.Visible = true; // // contextMenu1 // this.contextMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { this.menuItem1, this.menuItem2, this.menuItem3}); // // menuItem1 // this.menuItem1.Index = 0; this.menuItem1.Text = "设置&S"; this.menuItem1.Click += new System.EventHandler(this.menuItem1_Click); // // menuItem2 // this.menuItem2.Index = 1; this.menuItem2.Text = "-"; // // menuItem3 // this.menuItem3.Index = 2; this.menuItem3.Text = "退出&Q"; this.menuItem3.Click += new System.EventHandler(this.menuItem3_Click); // // button2 // this.button2.Location = new System.Drawing.Point(48, 176); this.button2.Name = "button2"; this.button2.TabIndex = 8; this.button2.Text = "最小化"; this.button2.Click += new System.EventHandler(this.button2_Click); // // timer1 // this.timer1.Interval = 5000; this.timer1.Tick += new System.EventHandler(this.timer1_Tick); // // tB_mins // this.tB_mins.Location = new System.Drawing.Point(112, 124); this.tB_mins.Name = "tB_mins"; this.tB_mins.Size = new System.Drawing.Size(144, 21); this.tB_mins.TabIndex = 10; this.tB_mins.Text = "20000"; this.tB_mins.TextChanged += new System.EventHandler(this.tB_pwd_TextChanged); // // label4 // this.label4.Location = new System.Drawing.Point(32, 128); this.label4.Name = "label4"; this.label4.Size = new System.Drawing.Size(72, 23); this.label4.TabIndex = 9; this.label4.Text = "时间间隔："; // // label5 // this.label5.Location = new System.Drawing.Point(264, 129); this.label5.Name = "label5"; this.label5.Size = new System.Drawing.Size(40, 16); this.label5.TabIndex = 11; this.label5.Text = "毫秒"; // // button3 // this.button3.Location = new System.Drawing.Point(264, 176); this.button3.Name = "button3"; this.button3.TabIndex = 12; this.button3.Text = "应用"; this.button3.Click += new System.EventHandler(this.button3_Click); // // cB_autorun // this.cB_autorun.Location = new System.Drawing.Point(112, 152); this.cB_autorun.Name = "cB_autorun"; this.cB_autorun.Size = new System.Drawing.Size(160, 24); this.cB_autorun.TabIndex = 13; this.cB_autorun.Text = "启动时自动执行"; // // WinForm // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(368, 301); this.Controls.Add(this.cB_autorun); this.Controls.Add(this.button3); this.Controls.Add(this.label5); this.Controls.Add(this.tB_mins); this.Controls.Add(this.label4); this.Controls.Add(this.button2); this.Controls.Add(this.tB_status); this.Controls.Add(this.tB_pwd); this.Controls.Add(this.tB_user); this.Controls.Add(this.tB_server); this.Controls.Add(this.label3); this.Controls.Add(this.label2); this.Controls.Add(this.label1); this.Controls.Add(this.button1); this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon"))); this.MaximizeBox = false; this.Name = "WinForm"; this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen; this.Text = "收取邮件"; this.Load += new System.EventHandler(this.WinForm_Load); this.Activated += new System.EventHandler(this.WinForm_Activated); this.ResumeLayout(false); } #endregion /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new WinForm()); } private void button1_Click(object sender, System.EventArgs e) { string str_server; if ((tB_server.Text!="") && (tB_user.Text!="") && (tB_pwd.Text!="")) { TcpClient tcpc = new TcpClient(tB_server.Text,110); Byte[] outbytes; string input; NetworkStream ns = null; try{ ns = tcpc.GetStream(); StreamReader sr = new StreamReader(ns); tB_status.Text=sr.ReadLine(); input = "USER " + tB_user.Text + "/r/n"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) tB_status.Text=tB_status.Text+"/r/n"+sr.ReadLine(); input = "PASS " + tB_pwd.Text + "/r/n"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) tB_status.Text=tB_status.Text+"/r/n"+sr.ReadLine(); input = "STAT" + "/r/n"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) str_server=sr.ReadLine(); str_num=""; if (str_server.StartsWith("+OK")){ str_num=str_server.Split(' ')[1]; } else str_num=""; tB_status.Text=tB_status.Text+"/r/n"+str_server; input = "QUIT" + "/r/n"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) tB_status.Text=tB_status.Text+"/r/n"+sr.ReadLine(); } catch(InvalidOperationException ioe){ tB_status.Text="Could not connect to mail server"; } if (str_num!="") { WinForm1 form = new WinForm1(); form.str_num=str_num; form.ScrollShow(); } } } private void WinForm_Activated(object sender, System.EventArgs e) { if (f_open) { this.Hide(); f_open=false; } } private void menuItem3_Click(object sender, System.EventArgs e) { this.Close(); } private void menuItem1_Click(object sender, System.EventArgs e) { this.Show(); this.Focus(); } private void button2_Click(object sender, System.EventArgs e) { this.Hide(); } private void timer1_Tick(object sender, System.EventArgs e) { button1_Click(sender,e); } private void tB_pwd_TextChanged(object sender, System.EventArgs e) { timer1.Enabled=false; if ((tB_server.Text!="") && (tB_user.Text!="") && (tB_pwd.Text!="")) { timer1.Interval=System.Convert.ToInt32(tB_mins.Text); timer1.Enabled=true; } else { timer1.Enabled=false; } } private void button3_Click(object sender, System.EventArgs e) { RegistryKey rk; Registry.CurrentUser.CreateSubKey("Software//yousoft"); rk=Registry.CurrentUser.OpenSubKey("Software//yousoft",true); rk.Setvalue("server",tB_server.Text); rk.Setvalue("user",tB_user.Text); rk.Setvalue("pwd",tB_pwd.Text); rk.Setvalue("interval",tB_mins.Text); if (cB_autorun.Checked) { rk=Registry.CurrentUser.OpenSubKey("Software//Microsoft//Windows//CurrentVersion//Run",true); rk.Setvalue("chkmail",Application.ExecutablePath); } else { rk=Registry.CurrentUser.OpenSubKey("Software//Microsoft//Windows//CurrentVersion//Run",true); rk.Deletevalue("chkmail"); } rk.Close(); } private void WinForm_Load(object sender, System.EventArgs e) { RegistryKey rk; rk=Registry.CurrentUser.OpenSubKey("Software//yousoft",false); object srv=rk.Getvalue("server"); if (srv!=null) tB_server.Text=srv.ToString(); object usr=rk.Getvalue("user"); if (usr!=null) tB_user.Text=usr.ToString(); object pwd=rk.Getvalue("pwd"); if (pwd!=null) tB_pwd.Text=pwd.ToString(); object mins=rk.Getvalue("interval"); if (mins!=null) tB_mins.Text=mins.ToString(); rk.Close(); } }}按F9编译程序并运行。如图： [ 相关贴图 ] [ 相关贴图 ] [ 相关贴图 ] 四．小结：　　本文向读者介绍了如何运用Borland C# builder实现POP3信箱的监视，其中大量运用了Windows Forms编程和.Net框架下的网络编程的原理。通过本文，希望能使读者对.Net中的Borland C# builder有一个感性的认识，同时对Windows Forms编程和其中的网络编程也有个大致的了解。如果有兴趣，可以到悠游在线(网址： http://yousoft.hi.com.cn )下载全部的源代码或与本人交流。下载源码： [ 点击下载 ]

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