C# Builder 实现POP3信箱的监视

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:CenterScreen

MaximizeBox: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();

}